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Abstract

The current manuscript is a translation of the Position statement on youth resistance training: the 2014 International Consensus. The original manuscript was adapted from the oficial position statement of the UK Strength and Conditioning Association on youth resistance training. It was subsequently reviewed and endorsed by leading professional organisations within the fields of sports medicine, exercise science and paediatrics. The authorship team for this article was selected from the fields of paediatric exercise science, paediatric medicine, physical education, strength and conditioning and sports medicine.
Position statement on youth resistance training:
the 2014 International Consensus
Rhodri S Lloyd,
1
Avery D Faigenbaum,
2
Michael H Stone,
3
Jon L Oliver,
1
Ian Jeffreys,
4
Jeremy A Moody,
1
Clive Brewer,
5
Kyle C Pierce,
6
Teri M McCambridge,
7
Rick Howard,
8
Lee Herrington,
9
Brian Hainline,
10
Lyle J Micheli,
11,12,13
Rod Jaques,
14
William J Kraemer,
15
Michael G McBride,
16
Thomas M Best,
17
Donald A Chu,
18,19
Brent A Alvar,
18
Gregory D Myer
7,13,20
For numbered afliations see
end of article.
Correspondence to
Dr Gregory D Myer, Division of
Sports Medicine, Cincinnati
Childrens Hospital Medical
Center 3333 Burnet Ave,
MLC 10001, Cincinnati,
OH 45229, USA;
greg.myer@cchmc.org
Adapted from the position
statement of the UK Strength
and Conditioning Association
on youth resistance training
Endorsed by: American
Academy of Pediatrics (AAP);
American Alliance for Health,
Physical Education, Recreation
and Dance (AAHPERD);
American Medical Society for
Sports Medicine (AMSSM);
British Association of Sports
Rehabilitators and Trainers
(BASRaT); International
Federation of Sports Medicine
(FIMS); Faculty of Sport and
Exercise Medicine UK (FSEM);
North American Society for
Pediatric Exercise Medicine
(NASPEM); National Athletic
TrainersAssociation (NATA);
Chief Medical Ofcer, National
Collegiate Athletic Associaiton
(NCAA); National Strength and
Conditioning Association
(NSCA)
Accepted 17 August 2013
To cite: Lloyd RS,
Faigenbaum AD, Stone MH,
et al.Br J Sports Med
Published Online First:
[please include Day Month
Year] doi:10.1136/bjsports-
2013-092952
ABSTRACT
The current manuscript has been adapted from the ofcial
position statement of the UK Strength and Conditioning
Association on youth resistance training. It has
subsequently been reviewed and endorsed by leading
professional organisations within the elds of sports
medicine, exercise science and paediatrics. The authorship
team for this article was selected from the elds of
paediatric exercise science, paediatric medicine, physical
education, strength and conditioning and sports medicine.
OPERATIONAL DEFINITIONS
Prior to discussing the literature surrounding youth
resistance training, it is pertinent to dene key ter-
minologies used throughout the manuscript.
Childhood represents the developmental period
of life from the end of infancy to the beginning
of adolescence. The term children refers to girls
and boys (generally up to the age of 11 and
13 years, respectively) who have not developed
secondary sex characteristics.
1
The term adolescence refers to a period of life
between childhood and adulthood. Although ado-
lescence is a more difcult period to dene in
terms of chronological age due to differential mat-
uration rates,
2
girls 1218 years and boys 14
18 years are generally considered adolescents.
The terms youth and young athletes represent
global terms which include both children and
adolescents.
1
Growth is typically viewed as a quantiable
change in body composition, the size of the
body as a whole or the size of specic regions of
the body.
3
Maturation refers to the highly variable timing
and tempo of progressive change within the
human body from childhood to adulthood, and
which, in addition to growth, inuences overall
physical performance capabilities.
3
Training age refers to the number of years an
individual has been involved in a structured and
appropriately supervised training programme.
4
Resistance training refers to a specialised
method of conditioning whereby an individual
is working against a wide range of resistive loads
to enhance health, tness and performance.
5
Forms of resistance training include the use of
body weight, weight machines, free weights
(barbells and dumbbells), elastic bands and
medicine balls.
Weightlifting is a sport that involves the per-
formance of the snatch and clean and jerk lifts
in competition.
6
Weightlifting training refers to
a variety of multijoint exercises including the
snatch, clean and jerk and modied variations of
these lifts, that are explosive but highly con-
trolled movements that require a high degree of
technical skill.
Qualied professional is a term used to repre-
sent those individuals who are trained and
aware of the unique physiological, physical and
psychosocial needs of children and adolescents,
and possess a relevant and recognised strength
and conditioning qualication (eg, the UK
Strength and Conditioning Association (UKSCA)
Accredited Strength and Conditioning Coach or
National Strength and Conditioning Association
(NSCA) Certied Strength and Conditioning
Specialist). Importantly, such individuals should
have a strong pedagogical background to ensure
that they are knowledgeable of the different
styles of communication and interaction that
will be needed to effectively teach or coach chil-
dren and adolescents.
45
Qualied professionals
should possess the knowledge and expertise to
plan, teach and progress age-related resistance
training programmes to youth of all ages and
abilities using various forms of resistance exer-
cises, and should be able to identify and modify
technical deciencies when necessary. Qualied
professionals would also be expected to work
effectively and respectively with other health-
care practitioners (eg, physicians, physical thera-
pists, certied athletic trainers, registered
dieticians, physical education teachers, youth
coaches, paediatric exercise specialists and
researchers) to enhance the health and well-
being of all youth.
INTRODUCTION
Since seminal attempts to address concerns sur-
rounding prepubescent strength training,
7
the
concept of children and adolescents participating in
various forms of resistance training has been of
growing interest among researchers, clinicians and
practitioners. There is now a compelling body of
scientic evidence that supports regular participa-
tion in youth resistance training to reinforce posi-
tive health and tness adaptations and sports
performance enhancement. There is even stronger
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 1
Consensus statement
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support for the use of resistance training in youth provided that
these programmes are supervised by qualied professionals and
consistent with the needs, goals and abilities of children and
adolescents.
5813
Research has indicated that various forms of
resistance training can elicit signicant performance improve-
ments in muscular strength,
14
power production,
515
running
velocity,
16
change-of-direction speed
17
and general motor per-
formance
12
in youth. From a health perspective, evidence indi-
cates that resistance training can make positive alterations in
overall body composition,
18
reduce body fat,
19 20
improve
insulin-sensitivity in adolescents who are overweight
21
and
enhance cardiac function in children who are obese.
22
Importantly, it has also been demonstrated that regular partici-
pation in an appropriately designed exercise programme inclu-
sive of resistance training, can enhance bone-mineral density
and improve skeletal health
23 24
and likely reduce sports-related
injury risk in young athletes.
25 26
This would appear to be an
important consideration given that approximately 3.5 million
sports-related injuries in youth require a medical visit each year
in the USA.
27
Comparable relative data from Europe found that
nearly 1.3 million cases of sports-related injuries reported in
2009 required hospitalisation for children under the age of
15 years.
28
Additionally, muscular strength and resistance train-
ing have been associated with positive psychological health and
well-being in children and adolescents.
2933
The World Health Organization (WHO) and other public
health agencies now include resistance training as part of their
physical activity guidelines for children and adolescents.
3436
However, recent evidence indicates that the muscular strength
levels of school-age youth are decreasing.
3739
Progressive resist-
ance training under the supervision of qualied professionals
can offer a safe, effective and worthwhile method for reversing
this undesirable trend, while encouraging participation in resist-
ance training as an ongoing lifestyle choice. The importance of
effective education by qualied professionals is essential,
454041
as positive early experiences in physical education have been
associated with lifelong physical activity.
42
EFFECTS OF GROWTH AND MATURATION ON THE
DEVELOPMENT OF MUSCULAR STRENGTH DURING
CHILDHOOD AND ADOLESCENCE
It has been established previously that muscular strength devel-
opment is a multidimensional tness component that is inu-
enced by a combination of muscular, neural and biomechanical
factors.
43
Due to the non-linear development of physiological
processes such as stature and body mass during childhood and
adolescence, the assessment and monitoring of muscular
strength can be a challenging task during the growing years.
44
Similarly, a non-linear pattern emerges when examining the
development of physical performance qualities in younger
populations.
3
Assessments of muscular strength in children and
adolescents indicate that strength increases in a relatively linear
fashion throughout childhood for both boys and girls.
45
As chil-
dren reach the onset of puberty, they experience rapid growth
along with observable non-linear gains in muscular strength.
46
During this period, sex differences in muscular strength begin to
emerge, with boys demonstrating accelerated gains as a result of
the adolescent spurt, and girls appearing to continue to develop
in a more linear fashion.
3
Potential factors inherently respon-
sible for increases in strength during childhood appear to be
related to the maturation of the central nervous system,
47
for
example, improvements in motor unit recruitment, ring fre-
quency, synchronisation and neural myelination.
48 49
Strength
gains during adolescence are typically driven by further neural
development, but structural and architectural changes resulting
largely from increased hormonal concentrations, including tes-
tosterone, growth hormone and insulin-like growth factor play a
signicant role, especially in males.
2
Further increases in muscle
cross-sectional area, muscle pennation angle and continued
motor unit differentiation will typically enable adolescents to
express greater levels of force, and partly explain the age-related
differences in strength between children, adolescents and
adults.
50
The number of muscle bres that an individual will
possess is determined as a result of prenatal myogenesis,
51
and
therefore it should be noted that postnatal increases in muscle
cross-sectional area will be largely governed by increases in
muscle bre size, not an increase in the number of muscle
bres.
51 52
Sex-related differences in muscular strength are more evident
as children enter adolescence, with males consistently outper-
forming females.
53
Research has indicated that muscle growth
will largely explain the disparity between sexes, especially for
absolute measures of muscular strength and power.
54 55
It is
essential that those responsible for teaching and training chil-
dren and adolescents are aware of these paediatric scientic
principles to ensure that an exercise prescription is planned
according to the unique demands of the individual inclusive of
baseline tness levels, motor skill development, movement com-
petencies and health or medical issues. Owing to the highly
individualised nature of growth and maturation, children and
adolescents of the same chronological age will vary markedly in
biological status (up to 45 years), and consequently, chrono-
logical age is deemed a weak indicator of maturational status.
56
Awareness of the potential variation in biological age among
children of the same chronological age group is a central tenet
of most long-term physical development programmes in order
to ensure that youth are trained according to their biological
status, as opposed to age-group classications.
45762
In addition
to chronological and biological age, those responsible for the
design and implementation of youth resistance training pro-
grammes must take into consideration the training age of the
individual.
4
From a developmental perspective, this becomes
critically important when training an adolescent who is
approaching adulthood, but has no experience of participating
in a structured resistance training programme. Conversely, a
technically procient 10-year-old child should not be restricted
to introductory training methods, provided they have the inter-
est and desire to participate in more advanced training
programmes.
463
HEALTH BENEFITS OF RESISTANCE TRAINING FOR YOUTH
The WHO now recognises physical inactivity as the fourth
leading risk factor for global mortality for non-communicable
diseases, and supports participation in a variety of physical activ-
ities including those that strengthen muscle and bone.
35
Since
contemporary youth are not as active as they should be,
6467
children and adolescents should be encouraged to participate
regularly in play, games, sports and planned exercise in the
context of school and community activities. Not only is physical
activity essential for normal growth and development, but also
youth programmes that enhance muscular strength and funda-
mental movement skill performance early in life appear to build
the foundation for an active lifestyle later in life.
6871
Since mus-
cular strength is an essential component of motor skill perform-
ance,
21272
developing competence and condence to perform
resistance exercise during the growing years may have important
long-term implications for health, tness and sports
performance.
73
2 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
Consensus statement
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Resistance training as part of a well-rounded tness training
programme can offer unique health benets to children and
adolescents when appropriately prescribed and supervised.
Regular participation in youth resistance training programme
has been shown to elicit favourable short-term inuences on
musculoskeletal health, body composition and cardiovascular
risk factors.
11 7477
However, following a period of detraining
(812 weeks) various measures of muscular tness appear to
regress towards baseline values,
7880
suggesting that engagement
in resistance training should be viewed as a long-term, year-
round commitment to a well-constructed and varied periodised
programme.
Given the growing prevalence of youth who are overweight
and obese and the associated health-related concerns, the inu-
ence of resistance training on the metabolic health, body com-
position and injury risk prole of children and adolescents with
excess body fat has received increased attention.
21 8186
Although low intensity, long-duration aerobic exercise is typic-
ally prescribed for youth who are overweight or obese, excess
body fat and weight may hinder the performance of physical
activities such as jogging. Additionally, adolescents who are
overweight and obese are more than twice as likely to be injured
in sports and other physical activities compared with their peers
who are not overweight or obese, typically due to a reduced
ability to demonstrate and maintain postural stability.
84
Furthermore, youth deemed to be overweight and obese seem
to demonstrate signicantly lower motor coordination than
normal weight youth,
8789
which is of concern due to the estab-
lished relationship between motor coordination and levels of
physical activity.
70 9092
While the treatment of youth who are
overweight and obese is complex, participation in a formalised
training programme that is inclusive of resistance training may
provide an opportunity to improve their muscle strength,
enhance motor coordination and gain condence in their per-
ceived abilities to be physically active.
93 94
The available evidence indicates that resistance training has
the potential to offer observable health value to sedentary youth
and young athletes, and such training should always be designed
by qualied professionals to meet the needs of all children and
adolescents, regardless of body size or physical ability.
Resistance training and the growing skeleton
From a public health perspective, it is noteworthy that trad-
itional fears and misinformed concerns that resistance training
would be harmful to the developing skeleton have been replaced
by reports indicating that childhood may be the opportune time
to build bone mass and enhance bone structure by participating
in weight-bearing physical activities.
9597
Fears that resistance
training would injure the growth plates of youths are not sup-
ported by scientic reports or clinical observations, which indi-
cate that the mechanical stress placed on the developing growth
plates from resistance exercise, or high strain eliciting sports
such as gymnastics or weightlifting, may be benecial for bone
formation and growth.
29 98102
While children have a lower risk
of resistance training-related injury to joint sprains and muscle
strains than adults,
103
attention to initial postural alignment and
technical competency during all exercises throughout the train-
ing programme is essential to ensure safe and effective practice
irrespective of resistance training mode. While numerous
factors, including genetics and nutritional status inuence skel-
etal health, regular participation in sports and tness pro-
grammes, which include multijoint, moderate-to-high intensity
resistance exercise, can help to optimise bone-mineral accrual
during childhood and adolescence.
23 24 97 104110
In fact, the
literature suggests that childhood and adolescence are indeed
key developmental periods for increasing bone-mineral density,
and that failure to participate in moderate-to-vigorous weight-
bearing physical activity during these stages of growth may pre-
dispose individuals to long-term bone-health implica-
tions.
24 95 111
Furthermore, no scientic evidence indicates that
resistance training will have an adverse effect on linear growth
during childhood or adolescence
99 112
or reduce eventual height
in adulthood.
98100
INJURY PREVENTION BENEFITS OF RESISTANCE TRAINING
FOR YOUTH
Although the total elimination of sport-related and physical
activity-related injuries is an unrealistic goal, multifaceted train-
ing programmes that include general and specic strength and
conditioning activities may help to reduce the likelihood of
injuries in youth. Cahill and Grifth
113
incorporated resistance
training into their preseason conditioning for adolescent
American football players and reported a reduction in non-
serious knee injuries, as well as knee injuries requiring surgery,
over four competitive seasons. Hejna et al
114
reported that ado-
lescent athletes who incorporated resistance training in their
physical development programme suffered fewer injuries and
recovered from injuries with less time spent in rehabilitation as
compared with team-mates who did not participate in a similar
resistance training programme. Similarly, Soligard et al
115
suc-
cessfully reduced the risk of severe and overuse injuries in
female adolescent soccer players, following the implementation
of a comprehensive warm-up programme that incorporated
resistance-based exercises. Likewise, Emery and Meeuwisse
116
reported a reduction in overall injuries and acute injury inci-
dence in adolescent soccer players with the use of an integrative
training programme that included resistance training. Of note,
recent evidence suggests that adherence of adolescent female
soccer players to injury prevention programmes is greater when
facilitated by appropriately skilled coaches.
117
This underscores
the importance of regular coach education to ensure that quali-
ed professionals understand the mechanical requirements of
correct exercise techniques, fundamental principles of paediatric
exercise science and the pedagogical aspects of coaching youth
training programmes.
Despite specic case study reports highlighting acute resist-
ance training-related injuries,
112 118 119
such injuries have gener-
ally occurred when youth are unsupervised or supervised by
individuals with unqualied instruction and/or inappropriate
training loads.
29
Recent data examining acute resistance
training-related injuries in youth and adults reveal that approxi-
mately 77.2% of all injuries are accidental
103
and that most
injuries are potentially avoidable with appropriate supervision,
sensible training progression based on technical competency and
a safe training environment.
29
With respect to overuse injuries,
literature indicates that appropriately prescribed and well-
supervised training programmes will reduce the likelihood of
overuse injuries occurring in youth populations
120122
and that
resistance training focused on addressing the risk factors asso-
ciated with youth-sport injuries (eg, low-tness level, muscle
imbalances and errors in training) has the potential to reduce
overuse injuries by approximately 50% in children and adoles-
cents.
26 123
For example, training protocols incorporated into
preseason and in-season conditioning programmes reduced
overuse injury risks, and decreased anterior cruciate ligament
(ACL) injuries in adolescent athletes.
124128
It appears that multifaceted programmes that increase muscle
strength, enhance movement mechanics and improve functional
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 3
Consensus statement
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abilities may be the most effective strategy for reducing sports-
related injuries in young athletes.
116 124 129 130
Additionally, the
effectiveness of these injury prevention programmes is greater if
implemented in younger age groups prior to the onset of neuro-
muscular decits and biomechanical alterations.
130 131
Clearly,
participation in physical activity should not begin with competi-
tive sport but should evolve out of preparatory tness condi-
tioning that is sensibly progressed over time. This notion is
supported by the fact that basic jumping and landing activities
commonly encountered within both competitive sports and free-
play activities can expose individuals to ground reaction forces
of approximately 57 times body weight,
132 133
which are in
excess of the forces experienced during resistance training
activities.
Since physical inactivity is a risk factor for activity-related
injuries in children,
134
youth who participate regularly in
age-appropriate tness programmes, which include resistance
exercise, may be less likely to suffer an injury owing to the
apparent decline in free-time physical activity among children
and adolescents.
34 67 135137
As such, it seems that the musculo-
skeletal system of some aspiring young athletes may be ill-
prepared for the demands of sports practice and competi-
tion.
25 29 138 139
Recent position statements have recognised the
importance of physical activity and sport for youth, and
promote the early identication of tness decits in aspiring
young athletes and the proper prescription of training pro-
grammes to address individual limitations.
140 141
Consequently,
aspiring young athletes should be encouraged to participate in,
and appreciate the value of, multifaceted preparatory condition-
ing programmes that include resistance training to address de-
cits in muscular tness and skill development, and enhance
symmetry in strength development around joints. Importantly,
for youth who participate in multiple sports or multiple leagues
within the same sport, resistance training sessions should not be
simply viewed as an addition to the overall sporting schedule,
but should form a compulsory component in lieu of additional
competitive events or sport-specic training sessions.
Resistance training considerations for young females
Musculoskeletal growth during puberty, in the absence of corre-
sponding neuromuscular adaptation, may facilitate the develop-
ment of abnormal joint mechanics and injury risk factors in
young adolescent girls.
142 143
If not addressed, these intrinsic
risk factors may continue to develop throughout adolescence,
thus predisposing female athletes to increased risk of
injuries.
144 145
In a recent longitudinal study, Ford et al
146
noted that young females who did not participate in resistance
training programmes as they matured developed injury risk
factors (eg, increased knee valgus moment when landing).
Conversely, those maturing athletes who did report participation
in resistance training activities were found to have safer move-
ment mechanics and increased posterior chain strength.
146
Well-supervised, multifaceted resistance training programmes
have been shown to reduce abnormal biomechanics (eg,
increased knee valgus landing) that manifest during adoles-
cence
127 128 147 148
and appear to decrease injury rates in
female athletes.
127
The ndings of a recent meta-analysis
revealed that within existing literature, an age-related association
between resistance training and reduction of ACL incidence
only occurred in the youngest female athletes (1418 years),
indicating that the earlier youth can engage with a well-rounded
training programme inclusive of resistance training, the lower
the likelihood of ACL injury.
130
Resistance training utilised to
enrich the motor learning environment in early youth may
initiate adaptation and help low-motor competence children
catch-upwith their peers in neuromuscular control.
149153
In
addition to reduced knee injuries in adolescent
154
and
mature
155
female athletes, regular participation in a multifaceted
resistance training programme may also induce measures of the
neuromuscular spurt,dened as the natural increases in muscle
power, strength and coordination that occurs with increasing
age in adolescent boys,
139
which are not typically seen in
females.
128 153
Of potential interest to sports medicine profes-
sionals, resistance training timed with growth and development
may induce the desired neuromuscular spurt, which may
improve sports performance and improve biomechanics related
to injury risk in young females.
128 144
Observed relative gains in
females can be greater than in males, perhaps because baseline
neuromuscular performance levels are lower on average in
females.
128 156159
PSYCHOSOCIAL BENEFITS OF RESISTANCE TRAINING FOR
YOUTH
At present, research examining the psychological benets of
resistance training for youth is limited, and the literature that is
available has thus far produced equivocal ndings. While a
small number of studies have previously failed to demonstrate
signicant resistance training-induced psychological benets for
healthy youth,
112 160
other research indicates that physical activ-
ity interventions inclusive of resistance training can lead to
improvements in psychological well-being,
30 33
mood and self-
appraisal.
161
Of note, youth who possess relatively low levels of
self-concept at the start of an exercise programme may be more
likely to show signicant improvement in comparison with
those who begin training with a relatively high self-concept.
160
Research indicates that self-concept and self-perception are
related to an individuals level of engagement in physical activ-
ity.
162166
It has been reported that adolescent girls improved
their physical self-perceptions in response to an 8-week resist-
ance training programme.
167
Similarly, various measures of self-
concept have been shown to improve in adolescent males and
females after a 12-week resistance training programme.
32
Collectively, these ndings indicate that age-related resistance
training can have a favourable inuence on the psychological
well-being of school-age youth provided that self-improvement
and enjoyment remain central to the training programme.
It should be noted that excessive volumes of physical training
(inclusive of resistance training) could lead to negative psycho-
social effects, especially for those youth who are emotionally
and psychologically vulnerable.
168
Excessive training with inad-
equate recovery may lead to a child or adolescent experiencing
overtraining syndrome, which is identied by prolonged mal-
adaptation of biological, neurochemical and hormonal systems.
In addition to physiological concerns, overtraining can have
serious psychosocial consequences
169
and may require substan-
tial time for a young athlete to make a full recovery.
170
This
highlights the need for appropriate prescription and supervision
by qualied professionals who listen to individual concerns and
understand the physical and psychological uniqueness of
younger populations.
EFFECTIVENESS OF YOUTH RESISTANCE TRAINING FOR
THE DEVELOPMENT OF MUSCLE STRENGTH, MOTOR SKILL
AND PHYSICAL PERFORMANCE
The term trainabilitydescribes the sensitivity of developing
athletes to a given training stimulus.
2
As previously documented,
children and adolescents will increase muscular strength levels
as a result of growth and maturation.
2356171172
Growth and
4 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
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maturation can obscure the effects of training, as they can quite
often mask potential training effects if the intensity and volume
of the conditioning programme are suboptimal.
169 173 174
The
appropriate development of muscular strength can have import-
ant implications for sport and daily life. To induce adaptations
in muscular strength above and beyond those of growth and
maturation alone, the volume and intensity of training stimulus
must be sufcient.
2 5 12 175 176
Research clearly indicates that
appropriately designed resistance training programmes can
benet youth of all ages, with children as young as 56 years of
age making noticeable improvements in muscular tness follow-
ing exposure to basic resistance training exercises using free
weights, elastic resistance bands and machine weights.
161 177179
Irrespective of chronological age, it is recommended that any
child engaging in a form of resistance training is emotionally
mature enough to accept and follow directions, and possesses
competent levels of balance and postural control.
59
While
reports indicate that the magnitude of absolute strength gains is
greater in adolescents (effect size=1.91) in comparison to chil-
dren (effect size=0.81),
14
relative increases in strength appear
to be similar during the developmental periods of childhood
and adolescence.
119 180 181
It is acknowledged that muscular strength is important for
effective motor skill performance.
272
Findings from a recent
meta-analysis showed that resistance training is effective in
enhancing motor skill performance ( jumping, running and
throwing tasks), and that children showed greater gains in per-
formance than adolescents.
12
These ndings, in addition to
several reviews
41314252974100180182
highlight the effective-
ness of resistance training for enhancing motor skill perform-
ance in school-age youth, and underscore the importance of
implementing progressive interventions early in life when chil-
dren possess higher levels of neural plasticity.
Despite the growing body of evidence demonstrating that
resistance training can lead to established improvements in
motor performance through increases in qualities such as
strength, speed, power and other related characteristics,
12
an
aspect of discussion among some observers relates to the degree
of training-induced muscle hypertrophy that is possible in chil-
dren prior to puberty.
169 183185
Existing research suggests that
increases in muscular strength are a result of muscle cross-
sectional area, architectural (muscle size, moment arm length)
and neural (voluntary activation level) adaptations.
53 186
However, the mechanisms appear to differ according to the
stage of development and are tissue dependent (ie, muscle vs
tendon). The primary mechanism underlying resistance
training-induced gains in muscular strength and related charac-
teristics before puberty depend primarily on neural adapta-
tions.
2 49 187 188
However, among early and particularly late
adolescents, the effects of resistance training appear to be a
result of additional gains in lean body mass and muscle cross-
sectional area (especially in males); with further alterations in
neural mechanisms appearing to be the same as those adapta-
tions experienced by adults.
14 189
Therefore, the focus of resist-
ance training for children should be based on goals related to
enhancement of muscle strength, function and control, as
opposed to trying to make substantial increases in muscle size.
Indeed, when training children and adolescents the adoption of
a long-term approach to physical development should be imple-
mented with a clear understanding of the primary mechanisms
responsible for training-induced adaptations during different
stages of development.
441
Collectively, the existing literature highlights several import-
ant concepts. First, appropriate resistance training can result in
an increased level of strength during childhood and adoles-
cence.
12 14 182 190195
Gains in maximum strength have ranged
from approximately 10% to 90%,
14
depending on several
factors including the volume, intensity, frequency, duration and
design of the training programme, as well as the quality of
supervision.
196
However, in general, expected strength gains of
3040% are typically observed in untrained youth following
participation in an introductory (820 weeks) resistance training
programme.
5
Second, resistance training results in only a minor
sex-associated effect on both absolute and relative strength gains
among prepubertal children, however, the magnitude of effect
does appear to be a function of sex in older groups.
119
Third,
evidence indicates that the most effective programmes last more
than 8 weeks and involve multiple sets, and that generally
strength gains increase with the frequency of training sessions
per week.
12
Finally, following a short training programme,
detraining will be quite rapid.
7880
Consequently, youth should
be encouraged to participate in year-round resistance training in
order to maintain training-induced gains in muscular strength. It
should be noted that resistance training programmes for youth
should follow a training model with a progressive and systematic
variation in exercise selection, intensity, volume, frequency and
repetition velocity to enhance training adaptations, reduce
boredom and decrease the risk of overuse injuries.
197199
Qualied professionals should regularly assess the readiness of
youth to participate in resistance training sessions, and should
manipulate daily training sessions when appropriate.
Weightlifting for youth
The available literature indicates that participation in the sport
of weightlifting and the performance of weightlifting move-
ments as part of a strength and conditioning programme can be
safe, effective and enjoyable for children and adolescents pro-
vided qualied supervision and instruction are available and
progression is based on the technical performance of each
lift.
41 103 200202
However, it must be emphasised that regardless
of the exercise choice, all youth resistance training programmes
should be consistent with a participants training age, technical
competency and maturational status. Additionally, qualied pro-
fessionals who are knowledgeable of youth resistance training
protocols and are able to teach and progress a variety of exer-
cises including weightlifting movements should instruct such
programmes.
Weightlifting exercises have previously been used by paediat-
ric researchers to examine the potential effects of strength-
power training on a number of performance and physiological
variables.
200 203 204
The data gleaned from these studies indicate
that the incorporation of weightlifting exercises into a training
programme can produce positive alterations in body compos-
ition, cardiorespiratory variables, various motor tness para-
meters (eg, jumping and sprinting) and overall weightlifting
performance among youth.
200 203 204
Additionally, weightlifting
injury rate is reportedly lower than other forms of resistance
training and sports in general.
200 201
If training and competition
are properly supervised and sensibly progressed, then the per-
formance of weightlifting exercises may provide a safe and
effective stimulus for enhancing strength and power perform-
ance in school-age youth. Owing to the skill level required to
perform weightlifting movements correctly, it is important that
individuals responsible for teaching complex movements to
youth hold the requisite coaching qualications, and have
experience teaching weightlifting to children and adolescents to
ensure their continued safety and well-being.
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 5
Consensus statement
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RESISTANCE TRAINING GUIDELINES FOR CHILDREN AND
ADOLESCENTS
Training variable considerations
Exercise selection
While a range of exercises performed using a variety of equip-
ment can be prescribed to both children and adolescents, it is
vital that the fundamentals of technical competency are priori-
tised at all times. The principles of equipment suitability and
familiarity for paediatric testing, also apply for youth participat-
ing in a resistance training programme. The use of child-size
equipment (light barbells, small dumbbells or xed machine
weights) is important for children or adolescents to properly
and safely execute a movement with correct technique.
205
Some of the resistance modes available to those prescribing
youth resistance training programmes include bodyweight,
weight machines, free weights (ie, barbells and dumbbells),
elastic resistance bands and medicine balls; all of which have
been proven to elicit physiological adaptation and/or perform-
ance enhancement when used in youth resistance training
programmes.
17 21 79 80 112 128 153 177 190 206217
The selection of the resistance modality will largely depend
on the technical ability and baseline tness levels of the individ-
ual, the level of coaching expertise, the overall goal of the train-
ing programme and the availability of equipment. However,
when basic bodyweight exercise technique (eg, bodyweight
squatting, lunging, pressing and pulling movements) is suf-
ciently developed in the individual, exercises with free weights
should be incorporated into the training programme since alter-
native forms of resistance such as machine-based resistance have
been reported to stimulate less muscle activation in lower
body,
218
upper body
219
and whole-body
220
exercises compared
with free-weight resistance, albeit in adult populations. For
technically competent youth, dynamic qualities can be
enhanced with multijoint, velocity-specic training in the form
of free-weight resistance training (eg, weightlifting and
plyometrics).
202 210 212
For youths with a minimal training experience and associated
poor technical competency (ie, low-training age), qualied pro-
fessionals should employ a range of exercises which are
designed to promote the development of muscular strength and
enhance overall fundamental motor skill competency.
Childhood is deemed to be a crucial time in which to develop
motor skill competency, as it is during these formative years that
neuromuscular coordination is most susceptible to change.
221
During this stage of development, children will experience rapid
brain maturation,
222
and exposing children to key athletic move-
ment patterns at a time where natural strengthening of existing
synaptic pathways
223
and synaptic pruning
224
takes place, is
considered crucial for long-term athletic development
4
and life-
long physical activity.
225
Once the child can demonstrate appro-
priate technical competency, they can be introduced to more
advanced exercises that challenge the child in terms of coordin-
ation and require greater levels and rates of force production. In
the case of weightlifting exercises, which by their nature are
more complex movements, researchers have previously sug-
gested that early exposure should focus on technical develop-
ment using modied equipment and light external loads.
541
Training volume and intensity
Volume and intensity are key resistance training variables that
are routinely manipulated within a training session, or overall
phase of training, depending on the primary training goal of the
individual. Volume refers to the total number of times an
exercise is performed within a training session multiplied by the
resistance used (kg).
197 226
Intensity most commonly refers to
the resistance that is required to overcome during a repeti-
tion.
226
The relationship between volume and intensity is
inverse in nature; the greater the load (intensity), the lower the
number of repetitions that can be completed (volume) by the
individual.
226
Both variables must be considered synergistically
when prescribing resistance training to maximise physiological
adaptation and minimise injury risk. Exposing a child or adoles-
cent to excessive intensity (external loading) at the expense of
correct technique may lead to acute injury, while prescribing
excessive volume of training over a training block may induce a
state of overtraining. This highlights the need for qualied pro-
fessionals to not only understand resistance training prescription
theory but also the unique intricacies associated with youth of
different ages and maturity levels.
To prescribe appropriate training intensity, teachers and
coaches typically stipulate a percentage of an individualsone
repetition-maximum (1 RM). Research indicates that maximal
strength and power testing of children
227
and adolescents
228
is
safe and reliable when standardised protocols are implemented
and monitored by qualied professionals. While 1 RM measure-
ments are routinely used within paediatric research settings and
youth sport training facilities, owing to time and class size, phys-
ical education teachers and youth tness professionals may
benet from the use of alternative means of assessing strength.
Predictive equations that estimate 1 RM values from submaxi-
mal loads have been used in adult populations,
229231
however,
methods of predicting 1 RM values from higher repetition
ranges possess less accuracy, in particular when repetition ranges
exceed more than 10.
227
Additionally, the fatiguing effects of
higher RM testing schemes (eg, 5 RM or 10 RM) are note-
worthy since the cumulative effects of fatigue will inuence the
ability of a child or adolescent to maintain proper exercise tech-
nique throughout the testing set. If an overarching demonstra-
tion of muscular strength is the desired outcome, simple
eld-based measures such as vertical jump, long jump and hand-
grip strength assessment have been signicantly correlated to 1
RM strength values in youth and may serve as an appropriate
surrogate measure of muscular strength, especially in schools
and recreational settings.
232 233
Crucially, it should be noted
that a child or adolescent must be able to demonstrate sound
technical competency irrespective of the RM load or test
selected.
Progression of volume and intensity
When untrained or sedentary youth with a low-training age and
poor technical competency rst begin to participate in forma-
lised resistance training programmes, the use of 1RM measure-
ments (actual or predicted) to determine training intensities will
typically be unnecessary. Consequently, an appropriate repeti-
tion range should be prescribed to develop technical compe-
tency and acquire a base level of adaptation, and over time the
external load can be increased provided exercise technique has
sufciently improved. For individuals without prior experience
of resistance training, initial prescription should use low volume
(12 sets) and low-moderate training intensities (60% 1 RM)
for a range of exercises and movement patterns.
197
It should be
noted that when children are initially exposed to multijoint
resistance training exercises (eg, squatting), then multiple repeti-
tions might be counterproductive for motor control develop-
ment. Instead, it is recommended that children perform fewer
repetitions (13) and are provided with real-time feedback after
each repetition to ensure safe and correct movement
6 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
Consensus statement
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development. This is especially true for weightlifting exercises,
which will naturally require more frequent feedback owing to
the increased technical demands, associated with the move-
ments. Once basic exercise technique is competent, then pre-
scription should be progressed; for example, 24 sets of 612
repetitions with a low-moderate training intensity (80% 1
RM). Such progression should provide the child with sufcient
exposure in order to aid motor control development, while
serving as a suitable volume for physical conditioning. As train-
ing age and athletic competency increases, youth can be intro-
duced to periodic phases of lower repetition ranges (6) and
higher external loads (>85% 1 RM) in training, on the proviso
that technical competency remains.
15 77 200 234 235
However, it is important to note that not all exercises need to
be performed for the same number of sets and repetitions
within a training session. For example, an experienced adoles-
cent lifter may perform three sets of three repetitions of a
power-oriented exercise (eg, clean and jerk, snatch and deriva-
tives of these lifts); then complete three sets of 35 repetitions
of a large compound, multijoint movement (eg, back squat);
and then nish with two sets of 68 repetitions of a unilateral
exercise (eg, dumbbell lunge). Irrespective of the specicpre-
scription, qualied professionals must observe and monitor for
the effects of accumulated fatigue during the training session to
minimise the risks of fatigue-induced technique decrements,
which may predispose youth to training-related injury.
Depending on the learning environment, qualied profes-
sionals will need to provide feedback to ensure that technical
competency is maintained throughout each set of the training
programme. The frequency and mode of feedback will depend
to a large degree on the number of individuals training, type of
exercise being performed and the stage of learning and person-
ality traits of the youth involved. For example, when coaching a
novice, constructive feedback may be most helpful if it is pro-
vided after each repetition.
41
In physical education classes in
which the focus of the lesson is aimed at enhancing muscle
strength and fundamental motor skill development, constructive
feedback is most important since students are typically learning
the correct movement patterns for the rst time.
Rest intervals during training sessions
Available research indicates that children can recover more
quickly from fatigue-inducing resistance training,
236 237
and
are less likely to suffer muscle damage following this form of
exercise, owing to the increased pliability of their muscle
tissue.
238
Therefore, rest periods of approximately 1 min
should sufce for most children. However, this may need to
be increased (eg, 23 min) as the intensity of training
increases, especially if the exercises require high levels of skill,
force or power production (eg, weightlifting or plyometric
exercises). While children can recover more quickly from
short, intermittent high-intensity exercise bouts than
adults,
236 237 239
within-session resistance training performance
should always be monitored to ensure correct resistance exer-
cise technique is maintained throughout the training session.
As such, commercial metabolic high-intensity resistance train-
ing programmes characterised by insufcient recovery between
sets and exercises may result in the performance of potentially
injurious exercise movements.
Training frequency
Training frequency typically refers to the number of sessions per-
formed within a week. Previous research has indicated that 23
sessions per week on non-consecutive days is most appropriate
in order to develop muscular strength levels in children and
adolescents.
5 240
Behringer et al
14
recently substantiated these
recommendations, indicating that across 42 studies (where mean
training frequency was 2.7±0.8 sessions/week), training fre-
quency was signicantly correlated with increased resistance
training effect. Since youth are still growing and developing,
resistance training programmes should provide adequate time
for rest and recovery. Youth who participate in resistance train-
ing programmes with a high training frequency should be moni-
tored closely. Training frequency may increase as children go
through adolescence and approach adulthood, especially for
youth in competitive sport. While sampling and exposure to a
variety of physical activity experiences should be recommended
to help promote long-term physical development,
4225
parents,
coaches and tness professionals should be cognisant of the
potential difculties when youth participate in numerous activ-
ities resulting in the accumulation of high exercise volumes. For
youth participating in competitive sports, in-season resistance
training is needed to maintain gains in muscular tness and
reduce injury-risk. However, to reduce the chances of non-
functional overreaching or overtraining, and to allow natural
growth processes to occur, resistance training should not simply
be viewed as an additional training session within the overall
youth training programme, but as an alternative commitment in
place of sport-specic training sessions and/or competitive x-
tures. Depending on the competitive demands of the sport, any-
where between one and three resistance training sessions should
be completed in-season to enable the development (or at least
the maintenance) of previously acquired strength gains, and to
allow adequate time for rest and recovery. Increased lesson time
in physical education, taught by well-trained specialists may
hold a realistic and evidenced-based opportunity to increase
muscle strength and motor skill competency, which would facili-
tate an overall improvement in general physical tness.
272137
Research demonstrates that exposure to resistance training with
qualied supervision during exercise lessons or physical educa-
tion classes does not have an adverse effect on after-school per-
formance in adolescent athletes.
241
Repetition velocity
While moderate movement velocities may typically be recom-
mended for youth when learning new movements or exercises,
there is also a need to promote the intention to move quickly to
develop motor unit recruitment patterns and ring frequencies
within the neuromuscular system.
242
A child with limited train-
ing experience may need to perform resistance exercises with a
moderate speed to maximise control and ensure correct tech-
nical development (eg, limb alignment, maintenance of correct
posture); however, a participant with a training history of
several months should be exposed to much greater movement
velocities. Repetition velocities may also uctuate within a
session; for example, the movement preparation phase (includ-
ing low load technical warm-up exercises) may consist of slower,
controlled movements, however, the main strength and power
exercises (inclusive of weightlifting and plyometric exercises)
will involve rapid movement speeds. For resistance training
exercises, the mass of the resistance will govern the velocity at
which the movement is performed. Although heavy strength
development exercises such as squatting, deadlifting, pressing
and pulling will typically involve slower movement velocities,
there should always be an intention to move as explosively as
possible to promote appropriate neuromuscular adaptations and
to maximise the transfer of training effect,
243
providing the
individual can demonstrate appropriate technique. The
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 7
Consensus statement
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development of high velocity movement may be especially
important during the growing years when neural plasticity and
motor coordination are most sensitive to change.
224
SUMMARY
A compelling body of scientic evidence supports participation
in appropriately designed youth resistance training programmes
that are supervised and instructed by qualied professionals.
The current article has added to previous position statements
from medical and tness organisations, and has outlined the
health, tness and performance benets associated with this
training for children and adolescents. In summarising this
manuscript, it is proposed that
1. The use of resistance training by children and adolescents is
supported on the proviso that qualied professionals design
and supervise training programmes that are consistent with
the needs, goals and abilities of younger populations.
2. Parents, teachers, coaches and healthcare providers should
recognise the potential health and tness-related benets of
resistance exercise for all children and adolescents. Youth
who do not participate in activities that enhance muscle
strength and motor skills early in life may be at increased
risk for negative health outcomes later in life.
3. Appropriately designed resistance training programmes may
reduce sports-related injuries, and should be viewed as an
essential component of preparatory training programmes for
aspiring young athletes.
4. Regular participation in a variety of physical activities that
include resistance training during childhood and adolescence
can support and encourage participation in physical activity
as an ongoing lifestyle choice later in life.
5. Resistance training prescription should be based according to
training age, motor skill competency, technical prociency
and existing strength levels. Qualied professionals should
also consider the biological age and psychosocial maturity
level of the child or adolescent.
6. The focus of youth resistance training should be on develop-
ing the technical skill and competency to perform a variety of
resistance training exercises at the appropriate intensity and
volume, while providing youth with an opportunity to par-
ticipate in programmes that are safe, effective and enjoyable.
Author afliations
1
Cardiff School of Sport, Cardiff Metropolitan University, Cardiff, Wales, UK
2
Department of Health and Exercise Science, The College of New Jersey, Ewing,
New Jersey, USA
3
Center of Excellence for Sport Science and Coach Education, East Tennessee State
University, Johnson City, Tennessee, USA
4
Faculty of Health, Sport and Science, University of South Wales, UK
5
Widnes Vikings Rugby League Club, Widnes, UK
6
Department of Kinesiology and Health Science, Shreveport, Louisiana State
University, Louisiana, USA
7
Division of Sports Medicine, Cincinnati Childrens Hospital Medical Center,
Cincinnati, Ohio, USA
8
Department of Kinesiology, Temple University, Philadelphia, Pennsylvania, USA
9
School of Health Sciences, University of Salford, Salford, UK
10
National Collegiate Athletic Association (NCAA), Indianapolis, Indiana, USA
11
Department of Orthopaedics, Division of Sports Medicine, Boston Childrens
Hospital, Boston, Massachusetts, USA
12
Harvard Medical School, Boston, Massachusetts, USA
13
The Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA
14
Faculty of Sport and Exercise Medicine (FSEM), Edinburgh, UK
15
Human Performance Laboratory, Department of Kinesiology, University of
Connecticut, Storrs, Connecticut, USA
16
Division of Cardiology, The Childrens Hospital of Philadelphia, Philadelphia,
Pennsylvania, USA
17
Division of Sports Medicine, Department of Family Medicine, Sports Health and
Performance Institute, Ohio State University, Ohio, USA
18
Rocky Mountain University of Health Professions, Provo, Utah, USA
19
Athercare Fitness and Rehabilitation, Alameda, California, USA
20
Athletic Training Division, School of Allied Medical Professions, The Ohio State
University, Columbus, Ohio, USA
Competing interests None.
Patient consent Obtained.
Provenance and peer review Commissioned; internally peer reviewed.
REFERENCES
1 Lloyd RS, Faigenbaum AD, Myer GD, et al. United Kingdom Strength and
Conditioning Association Position Statement on youth resistance training. Prof
Strength Cond J 2012;26:2639.
2 Malina RM, Bouchard C, Bar-Or O. Growth, maturation, and physical activity.
Champaign, IL: Human Kinetics, 2004:320.
3 Beunen GP, Malina RM. Growth and biologic maturation: relevance to athletic
performance. In: Hebestreit H, Bar-Or O. eds. The child and adolescent athlete.
Oxford: Blackwell Publishing, 2008:317.
4 Lloyd RS, Oliver JL. The youth physical development model: a new approach to
long-term athletic development. Strength Cond J 2012;34:3743.
5 Faigenbaum AD, Kraemer WJ, Blimkie CJ, et al. Youth resistance training: updated
position statement paper from the National Strength and Conditioning Association.
J Strength Cond Res 2009;23:S6079.
6 Stone MH, Pierce KC, Sands WA, et al. Weightlifting: a brief overview. Strength
Cond J 2006;28:5066.
7 National Strength and Conditioning Association. Position paper on prepubescent
strength training. NSCA J 1985;7:2731.
8 American College of Sports Medicine. ACSMs guidelines for exercise testing and
prescription. 9th edn. Philadelphia, PA: Lippincott Williams and Wilkins, 2014.
9 American Academy of Pediatrics. Strength training by children and adolescents.
Pediatrics 2008;121:83540.
10 Baker D, Mitchell J, Boyle D, et al.Resistance training for children and youth: a
position stand from the Australian Strength and Conditioning Association (ASCA).
2007. http://www.strengthandconditioning.org (accessed 13 Jul 2011).
11 Behm DG, Faigenbaum AD, Falk B, et al. Canadian Society for Exercise Physiology
position paper: resistance training in children and adolescents. Appl Physiol Nutr
Metab 2008;33:54761.
12 Behringer M, Vom Heede A, Matthews M, et al. Effects of strength training on
motor performance skills in children and adolescents: a meta-analysis. Pediatr
Exerc Sci 2011;23:186206.
13 Stratton G, Jones M, Fox KR, et al. Position statement on guidelines for resistance
exercise in young people. J Sports Sci 2004;22:38390.
14 Behringer M, Vom Heede A, Yue Z, et al. Effects of resistance training in children
and adolescents: a meta-analysis. Pediatrics 2010;126:1199210.
15 Sander A, Keiner M, Wirth K, et al.I
nuence of a 2-year strength training
programme on power performance in elite youth soccer players. Eur J Sport Sci
2012: In press. doi:10.1080/17461391.2012.742572
16 Mikkola J, Rusko H, Nummela A, et al. Concurrent endurance and explosive type
strength training improves neuromuscular and anaerobic characteristics in young
distance runners. Int J Sports Med 2007;28:60211.
17 Thomas K, French D, Hayes PR. The effect of plyometric training techniques on
muscular power and agility in youth soccer players. J Strength Cond Res
2009;23:3325.
18 Schwingshandl J, Sudi K, Eibl B, et al. Effect of individualised training programme
during weight reduction on body composition: a randomised trial. Arch Dis Child
1999;81:4268.
19 Benson AC, Torode ME, Fiatarone Singh MA. The effect of high-intensity
progressive resistance training on adiposity in children: a randomized controlled
trial. Int J Obes 2008a;32:101627.
20 Watts K, Beye P, Siafarikas A. Exercise training normalizes vascular dysfunction
and improves central adiposity in obese adolescents. J Am Coll Cardiol
2004;43:18237.
21 Shaibi G, Cruz M, Ball G, et al. Effects of resistance training on insulin sensitivity
in overweight Latino adolescent males. Med Sci Sports Exerc 2006;38:120815.
22 Naylor LH, Watts K, Sharpe JA, et al. Resistance training and diastolic myocardial
tissue velocities in obese children. Med Sci Sports Exerc 2008;40:202732.
23 Álvarez-San Emeterio C, Palacios-Gil Antuñano N, López-Sobale AM, et al. Effect
of strength training and the practice of alpine skiing on bone mass density,
growth, body composition and the strength and power of the legs of adolescent
skiers. J Strength Cond Res 2011;25:287990.
24 Bass SL. The prepubertal yearsa unique opportune stage of growth when the
skeleton is most responsive to exercise. Sports Med 2000;30:738.
25 Myer GD, Faigenbaum AD, Chu D, et al. Integrative training for children and
adolescents: techniques and practices for reducing sports-related injuries and
enhancing athletic performance. Phys Sports Med 2011;39:7484.
8 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
Consensus statement
group.bmj.com on September 20, 2013 - Published by bjsm.bmj.comDownloaded from
26 Valovich-McLeod TC, Decoster LC, Loud KJ, et al. National Athletic Trainers
Association position statement: prevention of pediatric overuse injuries. J Athl Train
2011;46:20620.
27 American Academy of Orthopaedic Surgeons. A guide to safety for young athletes.
American Academy of Orthopaedic Surgeons Website. 2012. http://orthoinfo.aaos.
org/topic.cfm?topic=A00307 (accessed Mar 2012).
28 Bauer R, Steiner M. Injuries in the European Union statistics summary 2005
2007. Vienna: European Network for Sports Injury Prevention and European
Commission, Health and Consumers, 2009.
29 Faigenbaum AD, Myer GD. Resistance training among young athletes: safety,
efcacy and injury prevention effects. Br J Sports Med 2010;44:5663.
30 Holloway J, Beuter A, Duda J. Self-efcacy and training in adolescent girls. J Appl
Soc Psychol 1988;18:699719.
31 Padilla-Moledo C, Ruiz JR, Ortega FB, et al. Associations of muscular tness with
psychological positive health, health complaints, and health risk behaviors in
Spanish children and adolescents. J Strength Cond Res 2012;26:16713.
32 Velez A, Golem DL, Arent SM. The impact of a 12-week resistance training
program on strength, body composition, and self-concept of hispanic adolescents.
J Strength Cond Res 2010;24:106573.
33 Yu C, Sung R, Hau K, et al. The effect of diet and strength training on obese
childrens physical self concept. J Sports Med Phys Fitness 2008;48:7682.
34 Department of Health, Physical Activity, Health Improvement and Protection. Start
Active, Stay Active: a report on physical activity form the four home countries
Chief Medical Ofcers. 2011. https://www.gov.uk/government/publications
(accessed 26 Mar 2013).
35 World Health Organization. Global recommendations on physical activity for
health. Geneva: WHO Press, 2010.
36 United States Department of Health and Human Services. 2008 physical activity
guidelines for Americans. 2008. http://www.health.gov/paguidelines (accessed
26 Mar 2013).
37 Cohen DD, Voss C, Taylor MJD, et al. Ten-year secular changes in muscular tness
in English children. Acta Paediatr 2011;100:e1757.
38 Moliner-Urdiales D, Ruiz JR, Ortega FB, et al. Secular trends in health-related
physical tness in Spanish adolescents: the AVENA and HELENA studies. J Sci Med
Sport 2010;13:5848.
39 Runhaar J, Collard DCM, Kemper HCG, et al. Motor tness in Dutch youth:
differences over a 26-year period (19802006). J Sci Med Sport 2010;13:3238.
40 Verschuren O, Ada L, Maltais DB, et al. Muscle strengthening in children with
spastic cerebral palsy: considerations for future resistance training protocols. Phys
Ther 2011;91:11309.
41 Lloyd RS, Oliver JL, Meyers RW, et al. Long-term athletic development and its
application to youth weightlifting. Strength Cond J 2012;34:5566.
42 Kirk D. Physical education, youth sport and lifelong participation: the importance
of early learning experiences. Eur Phys Educ Rev 2005;11:23955.
43 De Ste Croix MBA. Muscle strength. In: Armstrong N, Van Mechelen W. eds.
Paediatric exercise science and medicine. Oxford: Oxford University Press,
2008:199211.
44 Ford PA, De Ste Croix MBA, Lloyd RS, et al. The long-term athlete development
model: physiological evidence and application. J Sports Sci 2011;29:389402.
45 Branta C, Haubenstricker J, Seefeldt V. Age changes in motor skills during
childhood and adolescence. Exerc Sport Sci Rev 1984;12:467500.
46 Parker DF, Round JM, Sacco P, et al. A cross-sectional survey of upper and lower
limb strength in boys and girls during childhood and adolescence. Ann Hum Biol
1990;17:199211.
47 Granacher U, Goeseles A, Roggo K, et al. Effects and mechanisms of strength
training in children. Int J Sports Med 2011;32:35764.
48 Kraemer WJ, Fry AC, Frykman PN, et al. Resistance training and youth. Pediatr
Exerc Sci 1989;1:33650.
49 Ramsay JA, Blimkie CJR, Smith K, et al. Strength training effects in prepubescent
boys. Med Sci Sports Exerc 1990;22:60514.
50 Tonson A, Ratel S, Le Fur Y, et al. Effect of maturation on the relationship
between muscle size and force production. Med Sci Sports Exerc 2008;40:91825.
51 Yan X, Zhu MJ, Dodson MV, et al. Developmental programming of fetal skeletal
muscle and adipose tissue development. J Genomics 2012;1:2938.
52 Brameld JM, Mostyn A, Dandrea J, et al. Maternal nutrition alters the expression
of insulin-like growth factors in fetal sheep liver and skeletal muscle. J Endocrinol
2000;167:42937.
53 OBrien TD, Reeves ND, Baltzopoulos V, et al. In vivo measurements of muscle
specic tension in adults and children. Exp Physiol 2010;95:20210.
54 Neu CM, Rauch F, Rittweger J, et al.Inuence of puberty on muscle development
at the forearm. Am J Physiol Endocrinol Metab 2002;283:E1037.
55 OBrien TD, Reeves ND, Baltzopoulos V, et al. Strong relationships exist between
muscle volume, joint power and whole-body external mechanical power in adults
and children. Exp Physiol 2009;94:73138.
56 Beunen GP. Biological maturation and physical performance. In: Duquet W,
Day JAP. eds. Kinanthropometry IV. London: E & FN Spon, 1993:190208.
57 Bailey R, Collins D, Ford P, et al.Participant development in sport: an academic
review. Sports Coach UK, 2010:1134.
58 Bailey R, Morley D. Towards a model of talent development in physical education.
Sport Educ Soc 2006;11:21130.
59 Balyi I, Hamilton A. Long-term athlete development: trainability in childhood and
adolescencewindows of opportunityoptimal trainability. Victoria: National
Coaching Institute British Columbia & Advanced Training and Performance Ltd,
2004.
60 Bompa TO. Total training for young champions. Champaign, IL: Human Kinetics,
2000:120.
61 Burgess DJ, Naughton GA. Talent development in adolescent team sports: a
review. Int J Sports Physiol Perform 2010;5:10316.
62 Norris SR. Long-term athlete development Canada: attempting system change and
multi-agency cooperation. Curr Sports Med Rep 2010;9:37982.
63 Faigenbaum AD, Westcott WL. Youth strength training. Champaign, IL: Human
Kinetics, 2009:316.
64 Ekelund U, Tomkinson G, Armstrong N. What proportion of youth are physically
active? Measurement issues, levels and recent time trends. Br J Sports Med
2011;45:85965.
65 Gortmaker S, Lee R, Cradock A, et al. Disparities in youth physical activity in the
United States: 20032006. Med Sci Sports Exerc 2012;44:88893.
66 Guthold R, Cowan M, Autenrieth C, et al. Physical activity and sedentary behavior
among schoolchildren: a 34 country comparison. J Pediatr 2010;157:439.
67 Nyberg G, Nordenfelt A, Ekelund U, et al. Physical activity patterns measured by
accelerometry in 6- to 10-yr-old children. Med Sci Sports Exerc 2009;41:18428.
68 Barnett L, Cliff K, Morgan P, et al. Adolescentsperception of the relationship
between movement skills, physical activity and sport. Eur Phys Educ Rev
2013;19:27185.
69 Barnett L, Van Beurden E, Morgan P, et al. Childhood motor skill prociency as a
predictor of adolescent physical activity. J Adolesc Health 2009;44:2529.
70 Lopes V, Rodrigues L, Maia J, et al. Motor coordination as predictor of physical
activity in childhood. Scand J Med Sci Sports 2011;21:6639.
71 Stodden D, Langendorfer S, Roberton M. The association between motor skill
competence and physical tness in young adults. Res Q Exerc Sport
2009;80:2239.
72 Tveter AT, Holm I. Inuence of thigh muscle strength and balance on hop length in
one-legged hopping in children aged 712 years. Gait Posture 2010;32:25962.
73 Myer GD, Faigenbaum AD, Stracciolini A, et al. Exercise decit disorder in youth: a
paradigm shift toward disease prevention and comprehensive care. Curr Sports
Med Rep 2013;12:24855.
74 Faigenbaum AD, Myer GD. Pediatric resistance training: benets, concerns, and
program design considerations. Curr Sports Med Rep 2010;9:1618.
75 Lau PWC, Kong Z, Choi C, et al. Effects of short-term resistance training on serum
leptin levels in obese adolescents. J Exerc Sci Fitness 2010;8:5460.
76 Ortega F, Ruiz J, Castillo M, et al. Physical tness in children and adolescence: a
powerful marker of health. Int J Obes 2008;32:111.
77 Sgro M, McGuigan MR, Pettigrew S, et al. The effect of duration of resistance
training interventions in children who are overweight or obese. J Strength Cond
Res 2009;23:126370.
78 Faigenbaum AD, Farrell AC, Fabiano M, et al. Effects of detraining on tness
performance in 7-year-old children. J Strength Cond Res 2013;27:32330.
79 Ingle L, Sleap M, Tolfrey K. The effect of a complex training and detraining
programme on selected strength and power variables in early pubertal boys.
J Sports Sci 2006;24:98797.
80 Faigenbaum AD, Westcott WL, Micheli LJ, et al. The effects of strength training
and detraining on children. J Strength Cond Res 1996;10:10914.
81 Cruz ML, Shaibi GQ, Weigensberg MJ, et al. Pediatric obesity and insulin
resistance: chronic disease risk and implications for treatment and prevention
beyond body weight modication. Annu Rev Nutr 2005;25:43568.
82 Davis JM, Tung A, Chak SS, et al. Aerobic and strength training reduces adiposity
in overweight Latina adolescents. Med Sci Sports Exerc 2009;41:1494503.
83 McGuigan MR, Tatasciore M, Newton RU, et al. Eight weeks of resistance training
can signicantly alter body composition in children who are overweight or obese.
J Strength Cond Res 2009;23:805.
84 McHugh M. Oversized young athletes: a weighty concern. Br J Sports Med
2010;44:459.
85 Suh S, Jeong IK, Kim MY, et al. Effects of resistance training and aerobic exercise
on insulin sensitivity in overweight Korean adolescents: a controlled randomized
trial. Diabetes Metab J 2011;35:41826.
86 VAN der Heijden G, Wang Z, Chu Z, et al. Strength exercise improves muscle mass
and hepatic insulin sensitivity in obese youth. Med Sci Sports Exerc
2010;42:197380.
87 Dhondt E, Deforche B, Vaeyens R, et al. Gross motor coordination in relation to
weight status and age in 5- to 12-year-old boys and girls: a cross sectional study.
Int J Pediatr Obes 2011;6:55664.
88 Lopes V, Stodden D, Bianchi M, et al. Correlation between BMI and motor
coordination in children. J Sci Med Sport 2012;15:3843.
89 Nunez-Gaunaurd A, Moore JG, Roach KE, et al. Motor prociency, strength,
endurance, and physical activity among middle school children who are healthy,
overweight, and obese. Pediatr Phys Ther 2013;25:1308.
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 9
Consensus statement
group.bmj.com on September 20, 2013 - Published by bjsm.bmj.comDownloaded from
90 Williams HG, Pfeiffer KA, ONeill JR, et al. Motor skill performance and physical
activity in preschool children. Obesity 2008;16:14216.
91 Wrotniak BH, Epstein LH, Dorn JM, et al. The relationship between motor
prociency and physical activity in children. Pediatrics 2006;118:e1758.
92 Okely AD, Booth ML, Patterson JW. Relationship of physical activity to fundamental
movement skills among adolescents. Med Sci Sports Exerc 2001;33:1899904.
93 Sothern MS, Loftin MJ, Udall JN, et al. Safety, feasibility, and efcacy of a
resistance training program in preadolescent obese children. Am J Med Sci
2000;319:3705.
94 Schranz N, Tomkinson G, Olds T. What is the effect of resistance training on the
strength, body composition and psychosocial status of overweight and obese
children and adolescents? A systematic review and meta-anlysis. Sports Med
2013;49:893907.
95 Gunter K, Almstedt H, Janz K. Physical activity in childhood may be the key to
optimizing lifespan skeletal health. Exerc Sports Sci Rev 2012;40:1321.
96 Vicente-Rodriguez G. How does exercise affect bone development during growth?
Sports Med 2006;36:5619.
97 Hind K, Burrows M. Weight-bearing exercise and bone mineral accrual in children
and adolescents: a review of controlled trials. Bone 2007;40:1427.
98 Burt LA, Greene DA, Ducher G, et al. Skeletal adaptations associated with
pre-pubertal gymnastics participation as determined by DXA and pQCT: an
asystematic review and meta-analysis. J Sci Med Sport 2013;16:2319.
99 Malina R. Weight training in youth-growth, maturation, and safety: an
evidence-based review. Clin J Sports Med 2006;16:47887.
100 Falk B, Eliakim A. Resistance training, skeletal muscle and growth. Paediatr
Endocrinol Rev 2003;1:1207.
101 Conroy BP, Kraemer WJ, Maresh CM, et al. Bone mineral density in elite junior
Olympic weightlifters. Med Sci Sports Exerc 1993;25:11039.
102 Virvidakis K, Georgiu E, Korkotsidis A, et al. Bone mineral content of junior
competitive weightlifters. Int J Sports Med 1990;11:2446.
103 Myer GD, Quatman CE, Khoury J, et al. Youth versus adult weightlifting injuries
presenting to United States emergency rooms: accidental versus nonaccidental
injury mechanisms. J Strength Cond Res 2009;23:205460.
104 Bass SL, Myburg K. The effect of exercise on peak bone mass and bone strength.
In: Warren M, Constantini N. eds. Sports endocrinology. Totowa, NJ: Humana
Press Inc, 2000:25380.
105 Blimkie CJ, Rice S, Webber CE, et al. Effects of resistance training on bone mineral
content and density in adolescent females. Can J Physiol Pharmacol
1996;74:102533.
106 Dias Quiterio AL, Carnero EA, Baptista FM, et al. Skeletal mass in adolescent male
athletes and nonathletes: relationships with high-impact sports. J Strength Cond
Res 2011;25:343947.
107 Fuchs RK, Bauer JJ, Snow CM. Jumping improves hip and lumbar spine bone mass
in prepubescent children: a randomized controlled trial. J Bone Miner Res
2001;16:14856.
108 Nichols DL, Snaborn CF, Love AM. Resistance training and bone mineral density in
adolescent females. J Pediatr 2001;139:494500.
109 Witzke KA, Snow CM. Effects of plyometric jump training on bone mass in
adolescent girls. Med Sci Sports Exerc 2000;32:10517.
110 Yu CCW, Sung RYT, So RCH, et al. Effects of strength training on body
composition and bone mineral content in children who are obese. J Strength Cond
Res 2005;19:66772.
111 Janz KF, Letuchy EM, Eichenberger Gilmore JM, et al. Early physical activity
provides sustained bone health benets later in childhood. Med Sci Sports Exerc
2010;42:10728.
112 Sadres E, Eliakim A, Constantini N, et al. The effect of long-term resistance
training on anthropometric measures, muscle strength, and self-concept in
pre-pubertal boys. Pediatr Exerc Sci 2001;13:35772.
113 Cahill B, Grifth E. Effect of preseason conditioning on the incidence and severity
of high school football knee injuries. Am J Sports Med 1978;6:1804.
114 Hejna WF, Rosenberg A, Buturusis DJ, et al. The prevention of sports injuries in
high school students through strength training. Natl Strength Coaches Assoc J
1982;4:2831.
115 Soligard T, Mycklebust G, Steffen K, et al. Comprehensive warm-up programme to
prevent injuries in young female footballers: cluster randomized controlled trial.
BMJ 2008;337:a2469.
116 Emery CA, Meeuwisse W. The effectiveness of a neuromuscular prevention strategy
to reduce injuries in youth soccer: a cluster-randomised controlled trial. Br J Sports
Med 2010;44:55562.
117 Steffen K, Meeuwise WH, Romiti M, et al. Evaluation of how different
implementation strategies of an injury prevention programme (FIFA 11+) impact
team adherence and injury risk in Canadian female youth football players: a
cluster-randomised trial. Br J Sports Med 2013;47:4807.
118 Rians CB, Wletman A, Cahill BR, et al. Strength training for prepubescent males:
is it safe? Am J Sports Med 1987;15:4839.
119 Lillegard WA, Brown EW, Wilson DJ, et al.Efcacy of strength training in
prepubescent to early postpubescent males and females: effects of gender and
maturity. Pediatr Rehabil 1997;1:14757.
120 Abernethy L, Bleakley C. Strategies to prevent injury in adolescent sport: a
systematic review. Br J Sports Med 2007;41:62738.
121 Stein CJ, Micheli LJ. Overuse injuries in youth sport. Phys Sports Med
2010;38:1028.
122 Olsen JS, Fleisig GS, Dun S, et al. Risk factors for shoulder and elbow injuries in
adolescent baseball pitchers. Am J Sports Med 2006;34:90512.
123 Micheli L, Natsis KI. Preventing injuries in team sports: what the team physician
needs to know. In: Micheli LJ, Pigozzi F, Chan KM, et al. eds. F.I.M.S. Team
Physician Manual. 3rd edn. London: Routledge, 2013:50520.
124 Hewett TE, Ford KR, Myer GD. Anterior cruciate ligament injuries in female
athletes: part 2, a meta-analysis of neuromuscular interventions aimed at injury
prevention. Am J Sports Med 2006;34:4908.
125 Hewett TE, Myer GD, Ford KR. Reducing knee and anterior cruciate ligament
injuries among female athletes: a systematic review of neuromuscular training
interventions. J Knee Surg 2005;18:828.
126 Myer GD, Ford KR, Brent JL, et al. The effects of plyometric versus dynamic
balance training on power, balance and landing force in female athletes.
J Strength Cond Res 2006;20:34553.
127 Myer GD, Ford KR, McLean SG, et al. The effects of plyometric versus dynamic
stabilization and balance training on lower extremity biomechanics. Am J Sports
Med 2006;34:4908.
128 Myer GD, Ford KR, Palumbo JP, et al. Neuromuscular training improves
performance and lower-extremity biomechanics in female athletes. J Strength Cond
Res 2005;19:5160.
129 DiStefano LJ, Padua DA, Blackburn JT, et al. Integrated injury prevention program
improves balance and vertical jump height in children. J Strength Cond Res
2010;24:33242.
130 Myer GD, Sugimoto D, Thomas S, et al. The inuence of age on the effectiveness
of neuromuscular training to reduce anterior cruciate ligament injury in female
athletes: a meta-analysis. Am J Sports Med 2013;41:20315.
131 Quatman-Yates CC, Myer GD, Ford KR, et al. A longitudinal evaluation of
maturational effects on lower extremity strength in female adolescent athletes.
Pediatr Phys Ther 2013;25:3239.
132 Dufek J, Bates B. The evaluation and prediction of impact forces during landings.
Med Sci Sports Exerc 1990;22:3707.
133 McNitt-Gray J, Hester D, Mathiyakom W, et al. Mechanical demand on multijoint
control during landing depend on orientation of the body segments relative to the
reaction force. J Biomech 2001;34:147182.
134 Bloemers F, Collard D, Paw M, et al. Physical inactivity is a risk factor for physical
activity-related injuries in children. Br J Sports Med 2012;46:66974.
135 Nader P, Bradley R, Houts R, et al. Moderate to vigorous physical activity from
ages 9 to 15 years. JAMA 2008;300:295305.
136 Tudor-Locke C, Johnson WD, Katzmarzyk PT. Accelerometer-determined steps per
day in US children and youth. Med Sci Sports Exerc 2010;42:224450.
137 US. Department of Health and Human Services. Physical Activity Guidelines for
Americans Midcourse Report Subcommittee of the Presidents Council on Fitness,
Sports & Nutrition. Physical Activity Guidelines for Americans Midcourse Report:
strategies to increase physical activity among youth. Washington, 2012.
138 Clark E, Tobias J, Murray L, et al. Children with low muscle strength are at
increased risk of fracture with exposure to exercise. J Musculoskelet Neuronal
Interact 2011;11:196202.
139 Myer GD, Faigenbaum AD, Ford KR, et al. When to initiate integrative
neuromuscular training to reduce sport-related injuries and enhance health in
youth. Curr Sports Med Rep 2011;10:15766.
140 Mountjoy M, Andersen L, Armstrong N, et al. International Olympic Committee
Consensus statement on the health and tness of young people through physical
activity and sport. Br J Sports Med 2011;45:83948.
141 American Academy of Pediatrics. Active healthy living: prevention of childhood
obesity through increased physical activity. Pediatrics 2006;117:183442.
142 Ford KR, Shapiro R, Myer GD, et al. Longitudinal sex differences during landing
in knee abduction in young athletes. Med Sci Sports Exerc 2010;42:192331.
143 Hewett TE, Myer GD, Ford KR. Decrease in neuromuscular control about the knee
with maturation in female athletes. JBone Joint Surg Am 2004;86:16018.
144 Hewett TE, Myer GD, Ford KR, et al. Biomechanical measures of neuromuscular
control and valgus loading of the knee predict anterior cruciate ligament injury risk
in female athletes: a prospective study. Am J Sports Med 2005;33:492501.
145 Myer GD, Ford KR, Barber Foss KD, et al. The incidence and potential pathomechanics
of patellofemoral pain in female athletes. Clin Biomech 2010;25:7007.
146 Ford KR, Myer GD, Hewett TE. Longitudinally decreased knee abduction and
increased hamstrings strength in females with self-reported resistance training.
Proceedings of the American College of Sports Medicine Annual Meeting. Denver,
Colorado, 2011.
147 Hewett TE, Stroupe AL, Nance TA, et al. Plyometric training in female athletes.
Decreased impact forces and increased hamstring torques. Am J Sports Med
1996;24:76573.
148 Myer GD, Ford KR, Brent JL, et al. Differential neuromuscular training effects on
ACL injury risk factors in high-riskversus low-riskathletes. BMC
Musculoskelet Disord 2007;8:17.
10 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
Consensus statement
group.bmj.com on September 20, 2013 - Published by bjsm.bmj.comDownloaded from
149 Cooper RM, Zubek JP. Effects of enriched and restricted early environments on the
learning ability of bright and dull rats. Can J Psychol 1958;12:15964.
150 Hands B. Changes in motor skill and tness measures among children with high
and low motor competence: a ve-year longitudinal study. J Sci Med Sport
2008;11:15562.
151 Rogasch NC, Dartnall TJ, Cirillo J, et al. Corticomotor plasticity and learning of a
ballistic thumb training task are diminished in older adults. J Appl Physiol
2009;107:187483.
152 Rosengren KS, Geert JP, Savelsbergh JK. Development and learning: a TASC-based
perspective of the acquisition of perceptual-motor behaviors. Infant Behav Dev
2003;26:47394.
153 Faigenbaum AD, Farrell A, Fabiano M, et al. Effects of integrative neuromuscular
training on tness performance in children. Pediatr Exerc Sci 2011;23:57384.
154 Hewett TE, Lindenfeld TN, Riccobene JV, et al. The effect of neuromuscular
training on the incidence of knee injury in female athletes. A prospective study.
Am J Sports Med 1999;27:699706.
155 Myklebust G, Engebretsen L, Braekken IH, et al. Prevention of anterior cruciate
ligament injuries in female team handball players: a prospective intervention study
over three seasons. Clin J Sports Med 2003;13:718.
156 Ford KR, Myer GD, Smith RL, et al. Use of an overhead goal alters vertical jump
performance and biomechanics. J Strength Cond Res 2005;19:3949.
157 Hewett TE, Myer GD, Ford KR, et al. Preparticipation physical exam using a box
drop vertical jump test in young athletes: the effects of puberty and sex. Clin J
Sports Med 2006;16:298304.
158 Kraemer WJ, Keuning M, Ratamess NA, et al. Resistance training combined with
bench-step aerobics enhances womens health prole. Med Sci Sports Exerc
2001;33:25969.
159 Quatman CE, Ford KR, Myer GD, et al. Maturation leads to gender differences in
landing force and vertical jump performance: a longitudinal study. Am J Sports
Med 2006;34:80613.
160 Faigenbaum AD, Zaichkowsky LD, Westoctt WL, et al. Psychological effects of
strength training on children. J Sport Behav 1997;20:16475.
161 Annesi J, Westcott W, Faigenbaum A, et al. Effects of a 12 week physical activity
program delivered by YMCA after-school counselors (Youth Fit for Life) on tness
and self-efcacy changes in 512 year old boys and girls. Res Q Exerc Sport
2005;76:46876.
162 AltintaşA, Axşçi FH. Physical self-esteem of adolescents with regard to physical
activity and pubertal status. Pediatr Exerc Sci 2008;20:14256.
163 Strauss RS. Childhood obesity and self-esteem. Pediatrics 2000;105:e15.
164 Dunton GF, Schneider M, Graham DJ, et al. Physical activity, tness, and physical
self-concept in adolescent females. Pediatr Exerc Sci 2006;18:24051.
165 Dunton GF, Jamner MS, Cooper DM. Physical self-concept in adolescent girls:
behavioural and physiological correlates. Res Q Exerc Sport 2003;74:
3605.
166 Knowles AM, Niven AG, Fawkner SG, et al. A longitudinal examination of the
inuence of maturation on physical self-perceptions and the relationship with
physical activity in early adolescent girls. J Adolesc 2009;32:55566.
167 Lubans DR, Aguiar EJ, Callister R. The effects of free weights and elastic tubing
resistance training on physical self-perception in adolescents. Psychol Sport Exerc
2010;11:497504.
168 Brenner JS. Overuse injuries, overtraining, and burnout in child and adolescent
athletes. Pediatrics 2007;119:12425.
169 Matos N, Winsley RJ. Trainability of young athletes and overtraining. J Sports Sci
Med 2007;6:35367.
170 Meussen R, Duclos M, Foster C, et al. Prevention, diagnosis, and treatment of the
overtraining syndrome: joint consensus statement of the European College of Sport
Science and the American College of Sports Medicine. Med Sci Sports Exerc
2013;45:186205.
171 Beunen GP, Malina RM. Growth and physical performance relative to the timing of
the adolescent spurt. Exerc Sport Sci Rev 1988;16:50340.
172 Beunen GP, Malina RM, Vant Hof MA, et al.Adolescent growth and motor
performance. Champaign, IL: Human Kinetics, 1988:69.
173 Baxter-Jones A, Helms P, Maffulli N, et al.Growth and development of male
gymnasts, swimmers, soccer and tennis players: a longitudinal study. Ann Hum
Biol 1995;22:38194.
174 Naughton G, Farpour L, Carlson J, et al. Physiological issues surrounding the
performance of adolescent athletes. Sports Med 2000;30:30925.
175 Docherty D, Wenger H, Collis M, et al. The effects of variable speed resistance
training on strength development in prepubertal boys. J Hum Mov Stud
1987;13:37782.
176 Hetherington M. Effect of isometric training on the elbow exion force torque of
grade ve boys. Res Q 1976;47:417.
177 Faigenbaum AD, Westcott WL, LaRousa Loud R, et al. The effects of different
resistance training protocols on muscular strength and endurance development in
children. Pediatrics 1999;104:e5.
178 Weltman A, Janney C, Rians C, et al. The effects of hydraulic resistance strength
training in pre-pubertal males. Med Sci Sports Exerc 1986;18:62938.
179 Kaufman LB, Schilling DL. Implementation of a strength training program for a
5-year-old child with poor body awareness and developmental coordination
disorder. Phys Ther 2007;87:45567.
180 Payne VG, Morrow JR, Johnson L, et al. Resistance training in children and youth.
Res Q 1997;68:808.
181 Pfeiffer R, Francis R. Effects of strength training on muscle development in
prepubescent, pubescent and postpubescent males. Phys Sports Med
1986;14:13443.
182 Falk B, Tenenbaum G. The effectiveness of resistance training in children: a
meta-analysis. Sports Med 1996;22:17686.
183 Blimkie CJ. Age- and sex-associated variation in strength during childhood:
anthropometric, morphologic, neurological, biomechanical, endocrinologic, genetic
and physical activity correlates. In: GisolC, Lamb D. eds. Perspectives in exercise
science and sports. Indianapolis, IN: Benchmark, 1989:99163.
184 Fukunaga T, Funato K, Ikegawa S. The effects of resistance training on muscle
area and strength in prepubertal age. Ann Physiol Anthropol 1992;11:35764.
185 Mersch F, Stoboy H. Strength training and muscle hypertrophy in children. In:
Oseid S, Carlsen K. eds. Children and exercise XIII. Champaign, IL: Human
Kinetics, 1989:16582.
186 Bouchant A, Martin V, Mafuletti NA, et al. Viewpoint: can muscle size fully
account for strength differences between children and adults. J Appl Physiol
2011;110:17489.
187 Sale DG. Strength training in children. In: GisolCV, Lamb DR. eds. Perspectives
in exercise science and sports medicine. Indianapolis, IN: Benchmark Press,
1989:165222.
188 Viru A, Loko J, Harro M, et al. Critical periods in the development of performance
capacity during childhood and adolescence. Eur J Phys Educ 1999;4:75119.
189 Ozmun JC, Mikesky AE, Surburg P. Neuromuscular adaptations following
prepubescent strength training. Med Sci Sports Exerc 1994;26:51014.
190 Dorgo S, King GA, Candelaria NG, et al. Effects of manual resistance training on
tness in adolescents. J Strength Cond Res 2009;23:228794.
191 Bucheit M, Mendez-Villanueva A, Delhomel G, et al. Improving sprint ability in
young elite soccer players: repeated shuttle sprints vs. explosive strength training.
J Strength Cond Res 2010;24:271522.
192 Chelly MS, Cherif N, Amar MB, et al. Relationships of peak leg power, 1 maximal
repetition half back squat and leg muscle volume to 5-M sprint performance in
junior soccer players. J Strength Cond Res 2010;24:26671.
193 Hass CJ, Feigenbaum MS, Franklin BA. Prescription of resistance training for
healthy populations. Sports Med 2001;31:95364.
194 Keiner M, Sander A, Wirth K, et al. Trainability of children and adolescents in the
front and back squat. J Strength Cond Res 2013;27:35762.
195 Lephart SM, Abt JP, Ferris CM, et al. Neuromuscular and biomechanical
characteristic changes in high school athletes: a plyometric versus basic resistance
program. Br J Sports Med 2005;39:9328.
196 Gentil P, Bottaro M. Inuence of supervision ratio on muscle adaptation to
resistance training in nontrained subjects. J Strength Cond Res 2010;24:63943.
197 Ratamess NA, Alvar BA, Evetoch TK, et al. Progression models in resistance
training for healthy adults. Med Sci Sports Exerc 2009;41:687708.
198 Plisk SS, Stone MH. Periodization strategies. Strength Cond J 2003;25:1937.
199 Stone MH, Potteiger JA, Pierce KC, et al. Comparison of the effects of three
different weight-training programs on the one repetition maximum squat.
J Strength Cond Res 2000;14:3327.
200 Byrd R, Pierce K, Reilly L, et al. Young weightliftersperformance across time.
Sports Biomech 2003;2:13340.
201 Hamill B. Relative safety of weightlifting and weight training. J Strength Cond Res
1994;8:537.
202 Pierce KC, Byrd R, Stone MH. Youth weightliftingis it safe? Weightlifting USA
1999;17:5.
203 Dvorkin LS. The training of young weightlifters 1316 years old. In:
Scheithauer BW, ed (translated). The 1975 Russian weightlifting yearbook.
Moscow: Fiskultura I Sport Publishing, 1975:3640.
204 Häkkinen K, Mero A, Kauhanen H. Specicity of endurance, sprint and strength
training on physical performance capacity in young athletes. J Sports Med
1989;29:2735.
205 Fleck SJ, Kraemer WJ. Strength training for young athletes. Champaign, IL: Human
Kinetics, 2005:69.
206 Christou M, Smilios I, Sotiropoulos K, et al. Effects of resistance training on the
physical capacities of adolescent soccer players. J Strength Cond Res
2006;20:78391.
207 Faigenbaum AD, Mediate P. The effects of medicine ball training on physical
tness in high school physical education students. Phys Educ 2006;63:1607.
208 Faigenbaum AD, Milliken L, Moulton L, et al. Early muscular tness adaptations in
children in response to two different resistance training regimens. Pediatr Exerc Sci
2005;17:23748.
209 Faigenbaum AD, LaRosa Loud R, OConnell J, et al. Effects of different resistance
training protocols on upper-body strength and endurance development in children.
J Strength Cond Res 2001;15:45965.
Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952 11
Consensus statement
group.bmj.com on September 20, 2013 - Published by bjsm.bmj.comDownloaded from
210 Faigenbaum AD, McFarland J, Keiper F, et al. Effects of a short term plyometric
and resistance training program on tness performance in boys age 12 to 15
years. J Sports Sci Med 2007;6:51925.
211 Granacher U, Muehlbauer T, Doeringer B, et al. Promoting strength and balance
in adolescents during physical education: effects of a short-term resistance
training. J Strength Cond Res 2011;25:9409.
212 Lloyd RS, Oliver JL, Hughes MG, et al. Effects of 4-weeks plyometric training on
reactive strength index and leg stiffness in male youths. J Strength Cond Res
2012;26:281219.
213 Meylan C, Malatesta D. Effects of in-season plyometric training within soccer
practice on explosive actions of young players. J Strength Cond Res
2009;23:260513.
214 Szymanski DJ, Szymanski JM, Molloy JM, et al. Effect of 12 weeks of wrist and forearm
training on high school baseball players. J Strength Cond Res 2004;18:43240.
215 Tsolakis CK, Vagenas GK, Dessypris AG. Strength adaptations and hormonal
responses to resistance training and detraining in preadolescent males. J Strength
Cond Res 2004;18:6259.
216 Tsolakis C, Messinis D, Stergioulas A, et al. Hormonal responses after strength
training and detraining in prepubertal and pubertal boys. J Strength Cond Res
2000;14:399404.
217 Zakas A, Doganis G, Papageorgopoulou M, et al. The effect of cycle ergometer
strength training in pubescent and post-pubescent untrained males. Isokinet Exerc
Sci 2004;14:4552.
218 Schwanbeck S, Chilibeck PD, Binsted G. A comparison of free weight squat to
Smith machine squat using electromyography. J Strength Cond Res
2009;23:258891.
219 Schick EE, Coburn JW, Brown LE, et al. A comparison of muscle activation
between a Smith machine and free weight bench press. J Strength Cond Res
2010;24:77984.
220 Jones RM, Fry AC, Weiss LW, et al. Kinetic comparison of free weight and machine
power cleans. J Strength Cond Res 2008;22:17859.
221 Borms J. The child and exercise: an overview. J Sports Sci 1986;4:420.
222 Rabinowickz T. The differentiated maturation of the cerebral cortex. In: Falkner F,
Tanner J. eds. Human growth: a comprehensive treatise, postnatal growth:
neurobiology. New York, NY: Plenum, 1986:385410.
223 Casey BJ, Giedd JN, Thomas KM. Structural and functional brain development and
its relation to cognitive development. Biol Psychol 2000;54:24157.
224 Casey BJ, Tottenham N, Liston C, et al. Imaging the developing brain: what have
we learned about cognitive development? Trends Cogn Sci 2005;9:10410.
225 Lubans DR, Morgan PJ, Cliff DP, et al. Fundamental movement skills in children
and adolescents. Sports Med 2010;40:101935.
226 Baechle TR, Earle RW, Wathen D. Resistance training. In: Baechle TR, Earle RW.
eds. Essentials of strength training and conditioning. Champaign, IL: Human
Kinetics, 2008:381412.
227 Faigenbaum AD, Milliken LA, Westcott WL. Maximal strength testing in healthy
children. J Strength Cond Res 2003;17:1626.
228 Faigenbaum AD, McFarland JE, Herman RE, et al. Reliability of the
one-repetition-maximum power clean test in adolescent athletes. J Strength Cond
Res 2012;26:4327.
229 Horvat M, Franklin C, Born D. Predicting strength in high school women athletes.
J Strength Cond Res 2007;21:101822.
230 Kravitz L, Akalan C, Nowicki K, et al. Prediction of 1 repetition maximum in high
school power lifters. J Strength Cond Res 2003;17:16772.
231 Mayhew J, Kerksick C, Lentz D, et al. Using repetitions to predict one-repetition
maximum bench press in male high school athletes. Pediatr Exerc Sci
2004;16:26576.
232 Milliken LA, Faigenbaum AD, LaRousa Loud R. Correlates of upper and lower body
muscular strength in children. J Strength Cond Res 2008;22:133946.
233 Castro-Piñero J, Ortega FB, Artero EG, et al. Assessing muscular strength in youth:
usefulness of standing long jump as a general index of muscular tness. J Strength
Cond Res 2010;24:181017.
234 Channell BT, Bareld JP. Effect of Olympic and traditional resistance training on
vertical jump improvement in high school boys. J Strength Cond Res
2008;22:15227.
235 Dasteridis G, Piliandis T, Mantzouranis N. The effect of different strength training
programmes on young athletessprint performance. Stud Phys Cult Tourism
2011;18:1417.
236 Faigenbaum AD, Ratamess N, McFarland J, et al. Effect of rest interval length on
bench press performance in boys, teens and men. Pediatr Exerc Sci
2008;20:45769.
237 Zafeiridis A, Dalamitros A, Dipla K, et al. Recovery during high-intensity
intermittent anaerobic exercise in boys, teens and men. Med Sci Sports Exerc
2005;37:50512.
238 Eston R, Byrne C, Twist C. Muscle function after exercise-induced muscle damage:
considerations for athletic performance in children and adults. J Exerc Sci Fitness
2003;1:8596.
239 Falk B, Dotan R. Child-adult differences in the recovery from high intensity
exercise. Exerc Sport Sci Rev 2006;34:10712.
240 Faigenbaum AD, Zaichkowsky L, Westcott WL, et al. The effects of a twice per
week strength training program on children. Pediatr Exerc Sci 1993;5:33946.
241 Faigenbaum AD, McFarland JE, Buchanan E, et al. After-school tness
performance is not altered after physical education lessons in adolescent athletes.
J Strength Cond Res 2010;24:76570.
242 Young WB. Transfer of strength and power training to sports performance. Int J
Sports Physiol Perform 2006;1:7483.
243 Kawamori N, Newton RU. Velocity specicity of resistance training: actual
movement velocity versus intention to move explosively. Strength Cond J
2006;28:8691.
12 Lloyd RS, et al.Br J Sports Med 2013;0:112. doi:10.1136/bjsports-2013-092952
Consensus statement
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published online September 20, 2013Br J Sports Med
Rhodri S Lloyd, Avery D Faigenbaum, Michael H Stone, et al.
training: the 2014 International Consensus
Position statement on youth resistance
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... Activities to increase muscle strength, such as resistance training, provide a powerful stimulus for strength development [14], and may therefore be of particular importance in young people in low-middle income country populations. Little is known however regarding the implementation and outcomes of resistance training interventions in low-middle income countries. ...
... This was used to determine the load corresponding to the prescribed intensity (% of 1RM) for the first week of training. The resistance training program was informed by accepted guidelines for resistance training in youth [14,27] and involved a twice a week progressive periodized program including a variety of exercises for all major muscle groups using resistance machine exercises (Sport fitness, Medellín, Colombia) and free weights (bars and dumbbells), medicine balls, Bosu and Swiss balls. Participants performed between 2 and 4 sets of an exercise with between 30-120 seconds rest between sets. ...
... Participants performed between 2 and 4 sets of an exercise with between 30-120 seconds rest between sets. An overview of the exercises integrated into the resistance training program are shown in Table 1, with specific exercise selection based on guidelines [14,27] and practical considerations such as what equipment was available, efficient use of time with that equipment, and variety to reduce monotony of the program. ...
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The aim of this study was to evaluate the impact on muscle strength, aerobic fitness and body composition, of replacing the physical education (PE) class of Colombian adolescents with resistance or aerobic training. 120 tanner stage 3 adolescents attending a state school were randomized to resistance training, aerobic training, or a control group who continued to attend a weekly 2-hour PE class for 16 weeks. The resistance training and aerobic training groups participated in twice weekly supervised after-school exercise sessions of < 1 hour instead of their PE class. Sum of skinfolds, lean body mass (bioelectrical impedance analysis), muscular strength (6 repetition maximum (RM)) bench press, lateral pulldown and leg press) and estimated cardiorespiratory fitness (multistage 20 meter shuttle run) were assessed at pre and post intervention. Complete data were available for n = 40 of the resistance training group, n = 40 of the aerobic training group and n = 30 PE (controls). Resistance training attenuated increases in sum of skinfolds compared with controls (d = 0.27, [0.09-0.36]). We found no significant effect on lean body mass. Resistance training produced a positive effect on muscle strength compared with both controls (d = 0.66 [.49-.86]) and aerobic training (d = 0.55[0.28-0.67]). There was a positive effect of resistance training on cardiorespiratory fitness compared with controls (d = 0.04 [-0.10-0.12]) but not compared with aerobic training (d = 0.24 [0.10-0.36]). Replacing a 2-hour PE class with two 1 hour resistance training sessions attenuated gains in subcutaneous adiposity, and enhanced muscle strength and aerobic fitness development in Colombian youth, based on a median attendance of approximately 1 session a week. Further research to assess PLOS ONE
... É compreendido como um processo organizado nos seus aspectos morfológicos e funcionais, impactando diretamente sobre a capacidade de execução de tarefas que envolvem demandas motoras, sejam elas esportivas ou não (5) . O treinamento físico em geral é regido por alguns princípios norteadores que fundamentam sua aplicação; sendo eles: (14) . ...
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RESUMO Quedas são eventos frequentes em idosos com déficit de força e massa muscular. Promovem institucionalização hospitalar, aumento do sedentarismo, sendo fator de risco para mortalidade em idosos. O objetivo foi analisar estudos que estabeleceram correlações entre programas de fortalecimento muscular e quedas, equilíbrio e desempenho de marcha em idosos. Uma revisão de literatura foi realizada em artigos científicos, livros, revistas e demais publicações científicas. As respostas foram positivas, mostrando a importância do exercício físico no cotidiano do idoso, pois melhora o desempenho físico, funcional e diminui o risco das quedas, por promoverem maior equilíbrio, melhora na mobilidade e qualidade de vida. Em conclusão, o fortalecimento muscular pode prolongar a independência física do idoso, reduzindo a chance de eventos agudos prejudiciais a sua saúde. Palavras-chave: Idosos. Equilíbrio. Marcha. ABSTRACT Falls are frequent events in the elderly with a deficit in strength and muscle mass. They promote hospital institutionalization, increase in sedentary lifestyle, being a risk factor for mortality in the elderly. The objective was to analyze studies that established correlations between muscle strengthening programs and falls, balance and gait performance in the elderly. A literature review was carried out on scientific articles, books, magazines and other scientific publications. The answers were positive, showing the importance of physical exercise in the daily life of the elderly, as it improves physical and functional performance and reduces the risk of falls, by promoting greater balance, improved mobility and quality of life. In conclusion, muscle strengthening can prolong the physical independence of the elderly, reducing the chance of acute events harmful to their health.
... Este estudio presenta la limitante de no haber considerado el estado de madurez de la muestra en cuestión, a pesar de existir evidencia que indican los efectos del crecimiento y maduración en el desarrollo de la fuerza muscular en la infancia y adolescencia (Lloyd et al., 2013;Moran et al., 2017); por ejemplo, se ha observado que el entrenamiento de fuerza generalmente es menos eficaz antes del brote de crecimiento puberal, comparado con entrenamientos de fuerza durante o post-brote de crecimiento (Meylan et al., 2014). Aún así el componente muscular pareciera tener relevancia, considerando diversos predictores de rendimiento en basquetbolistas adolescentes se ha indicado que la maduración esquelética, el tamaño corporal y la masa muscular de muslo puede explicar la generación de potencias máximas de corta duración (Carvalho et al., 2011). ...
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Resumen El propósito del estudio fue determinar el nivel de relación entre indicado-res antropométricos segmentarios de muscularidad con los niveles de potencia expresados en la fuerza explosiva y elástico-explosiva. Para ello se evaluó a 31 deportistas varones (edad = 15,5 ± 1,7 años; peso = 61,4 ± 11,5 kg) de diversas disciplinas del Programa de Proyec-ción Deportiva Nacional de la Región de Aysén, Chile, a través de los protocolos de la ISAK para las evaluaciones antropométricas y test de Bosco para la valoración de potencia de salto, tras lo cual se observó una alta intensidad de asociación entre potencia absoluta de los saltos SJ y CMJ, y todos los parámetros antropométricos de muslo (r >0,8). Con ello se logró establecer un modelo predictivo del rendimiento en salto mediante 3 mediciones antropométricas.
... The capacity to improve muscular strength changes across maturation as neural development, hormonal production, and muscle morphology typically contribute to an individual's ability to produce force (Tonson et al., 2008). On average, males experience an accelerated increase in strength and power through puberty while females continue to develop at a consistent rate (Lloyd et al., 2014). Following ACLR, females demonstrated decreased quadriceps function compared to males of similar ages during late-stage rehabilitation , but age and sex differences during the stages of adolescence is unknown. ...
Article
Background The incidence of anterior cruciate ligament (ACL) injuries have been consistently increasing in adolescents, with those who return to competitive sport having up to a 32% risk of a secondary ACL injury. There is limited evidence regarding knee strength outcomes in young adolescents following ACL reconstruction during late-stage rehabilitation when compared to older patient groups. Purpose The purpose of this study was to 1) establish normative knee strength values according to age group in adolescent female and male patients during late-stage rehabilitation following ACLR and 2) determine whether strength differences exist between age groups. Methods A retrospective review of adolescent patients who underwent primary ACL reconstruction was performed. Patients completed a standardized isokinetic (60°/sec) knee extension and flexion strength assessment during late-stage rehabilitation. Peak torque was normalized to the patient’s body mass (Nm/kg) and used to calculate Limb Symmetry Index (LSI). Analyses were conducted separately for female and male cohorts and grouped by early (11-14 years) and middle (15-17 years) adolescence. An independent samples t-test examined strength differences between age groups. Results 130 females (age=15.4 ± 1.4 years; days since surgery=239.0 ± 84.4) and 112 males (age=15.4 ± 1.5 years; days since surgery= 232.6 ± 91.2) were included. Normalized knee extension peak torque on the involved limb was reported for female (1.5 Nm/kg) and male (1.8 Nm/kg) cohorts. Differences between age groups in knee extension peak torque were found on the surgical and nonsurgical limbs in female (p = 0.02 – 0.05) and male (p<0.001 – 0.002) cohorts. No differences were found between age groups for either cohort when normalized to body mass (p = 0.30 – 0.89). Post hoc power analyses revealed 67% statistical power in the female cohort and 97% in the male cohort with an alpha level set to 0.05 based on the observed effect size for the differences in isokinetic knee extension/flexion peak torque between age groups. Conclusion Early adolescents produced less knee extension and flexion peak torque compared to middle adolescents after ACLR, but no differences were found between age groups when normalized to body mass for female or male cohorts. Normalized knee extension strength in young adolescents may differ from older patients and should be considered in the rehabilitation process. [Table: see text][Table: see text][Table: see text][Table: see text]
... A basic recommendation to increase strength level for soccer players with a lower strength level can therefore be made [44]. Longitudinal studies have already shown that strength training is preventive, safe, and performance-enhancing [53,64,65]. From this, it can be concluded that long-term strength training is recommended for elite youth soccer players to increase their performance in sprinting and jumping, and thereby, to potentially increase their game performances. ...
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This study aims to analyze the influence of relative strength performance, determined by parallel back squats (REL SQ), on 30 m sprinting (LS) and on jumping performance (squat [SJ], countermovement [CMJ]) in a large sample (n = 492) of elite youth soccer players. The soccer players were divided into subgroups based on their strength performance: strength level 1 (0.0–0.5 REL SQ), strength level 2 (>0.5–1.0 REL SQ), strength level 3 (>1.0 to 1.5 REL SQ), strength level 4 (>1.5 to 2.0 REL SQ), and strength level 5 (>2.0 REL SQ). The results of this study show that REL SQ explains 45–52% (r = |0.67–0.72|) of the variance of SJ, CMJ, and LS for the total sample. Strength levels 2–4 showed similar coefficients of correlation in jumping performance (r = |0.46–0.56|) and strength levels 2 and 3 in sprint performance (r = |0.38–0.44). The respective extreme strength levels showed lower coefficients of correlation with the sprinting and jumping performance variables (r = |0.00–0.23|). No coefficients could be calculated for strength level 5 because no athlete achieved an appropriate strength level (>2.0 REL SQ). The data from this study show a clear influence of REL SQ on sprint and jump performance, even in a large sample.
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RESUMO O objetivo deste trabalho foi realizar uma revisão bibliográfica sobre as lesões em corredores de rua e identificar o papel do treinamento de força para prevenção de lesões nesse público. Para a obtenção dos artigos desta revisão foram utilizadas as seguintes bases bibliográficas: PubMed, Google Acadêmico e Scielo. Foi verificado na literatura uma série de fatores de risco para lesões como: distância percorrida, volume de treinamento, duração, idade dos corredores e a sua biomecânica desenvolvida na corrida. Sobre o treinamento de força, ainda é limitado o número de pesquisas que demonstram os aspectos preventivos para lesões em corredores. Foram encontrados somente quatro trabalhos. A maioria aponta para menores porcentagens de lesões ao longo do tempo para os corredores praticantes de treinamento de força em comparação com aqueles que não praticam. Todavia os estudos não relatam as características do treinamento (frequência, volume, intensidade, densidade, etc.). Conclui-se que o treinamento de força pode ser uma ação preventiva para lesões em praticantes de corrida de rua. Porém, ainda são necessárias mais pesquisas para estabelecer o direcionamento das características ideais do treinamento para esse fim (frequência, volume, intensidade, dentre outras variantes do treinamento físico). ABSTRACT The objective of this work was to carry out a bibliographic review on the problems in street corridors and identification of the objective of force to prevent the public role in this regard. To obtain the articles in this review, the following Bibliography databases were used: PubMed, Google Scholar and Scielo. It was verified in the literature a series of risk factors for solutions such as: distance covered, training volume, duration, age of the runners and their biomechanics developed in the race. About strength training, it is still limited to the number of research that preventives for obstacles in operation. Only four works were found. Most point to lower percentages of time solutions for practical strength training runners compared to those who do not practice time training. However, studies do not relate training characteristics (frequency, volume, intensity, density, etc.). It is concluded that strength training can be a preventive action for practical street running exercises. However, there are still more variants among the physical characteristics to form or direct for this purpose (frequency, volume, intensity, other variants of training).
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Considering the effects of the COVID-19 pandemic on our society and health, resistance bands and tubes are great, simple and affordable tools to work out at home without attending any gym. COVID-19 affected our children in many ways. Children had limited physical activity at home and online instruction increased screen time and inactivity. The measures taken to reduce the spreading rate of the epidemic, the prolongation of stay at home, social isolation and quarantine processes caused young children to disrupt their physical activities, stay away from sports environments and sports activities as well. However, certainly no one can argue COVID-19 has changed the face of education. The current pandemic has forced K-12 schools to deliver quality and equitable education. Teachers and coaches can take advantage of teaching physical activity and sport skills via online delivery. Research indicated that resistance training provides many health and fitness benefits to children and adolescents as long as proper guidelines and training provided such as increased, muscle strength, muscle power-endurance, bone mineral density, improved motor skill performance and reduced sport injuries (Faigenbaum & Myer, 2010). As a result, resistance bands training could be an affordable and appropriate training at home for children with proper training and supervison during COVID-19 pandemic. Therefore, the purpose of this article to provide quidelines about how to train children using resistance bands.
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The aim of this study was to investigate the effect of strength training on sprinting performance. 27 young male athletes were divided into three groups: neuro-muscular (NGroup), hypertrophy (HGroup) and control (CGroup). The athletes in NGroup and HGroup were training 3 times per week for 8 weeks. The fastest times of 30 m and 60 m testing trials were recorded prior to, in the middle of and at the end of the training program. ANOVA revealed a significant improvement in fastest times in both 30 m (8%) and 60 m (5.9%) runs in the athletes from the NGroup. Similarly, the improvement in speed of HGroup athletes was 6.2% in 30 m and 5.2% in 60 m, respectively, while a slight improvement in fastest times in 30 m (2.1%) and 60 m (2.4%) was shown in the CGroup athletes. Conclusively, a greater improvement in speed in both 30 m and 60 m was observed in the athletes from the NGroup.
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The use of resistance training for children has increased in popularity and interest. It appears that children are capable of voluntary strength gains. Exercise prescription in younger populations is critical and requires certain program variables to be altered from adult perspectives. Individualization is vital, as the rate of physiological maturation has an impact on the adaptations that occur. The major difference in programs for children is the use of lighter loads (i.e., > 6 RM loads). It appears that longer duration programs (i.e., 10-20 wks) are better for observing training adaptations. This may be due to the fact that it takes more exercise to stimulate adaptational mechanisms related to strength performance beyond that of normal growth rates. The risk of injury appears low during participation in a resistance training program, and this risk is minimized with proper supervision and instruction. Furthermore, with the incidence of injury in youth sports, participation in a resistance training program may provide a protective advantage in one’s preparation for sports participation.