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What Performance Characteristics Determine Elite Versus Nonelite Athletes in the Same Sport?

Authors:
  • Specialists in Sports and Orthopedic Rehabilitation

Abstract

There are significant data comparing elite and nonelite athletes in anaerobic field and court sports as well as endurance sports. This review delineates specific performance characteristics in the elite athlete and may help guide rehabilitation. A Medline search from April 1982 to April 2012 was undertaken for articles written in English. Additional references were accrued from reference lists of research articles. In the anaerobic athlete, maximal power production was consistently correlated to elite performance. Elite performance in the endurance athlete is more ambiguous, however, and appears to be related to the dependent variable investigated in each individual study. In anaerobic field and court sport athletes, maximal power output is most predictive of elite performance. In the endurance athlete, however, it is not as clear. Elite endurance athletes consistently test higher than nonelite athletes in running economy, anaerobic threshold, and VO2max.
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Lorenz et al Nov • Dec 2013
The ability to distinguish elite from nonelite athletes is
not clearly defined. Traditionally, those athletes drafted
in higher rounds or playing in higher divisions are elite.
Differentiating these levels is a multifaceted process.
Several variables have been investigated to define the
elite athlete, including anthropometric and physiologic
characteristics,2,3,33 -35,45,61,62,66,77,74,92 balance,44 the role of the
athlete on the team,11,77 length of training,45 type of performance
training,13,24,44,4 6,65 talent development and maturation,1,3 ,19,6 6,74, 88
and physical performance.7,15, 91 The multiple variables attest to
the complexity of the elite athlete.
Confounding the delineation is the question of which
performance characteristics are most predictive of success. Are
elite athletes simply of a different genetic makeup than nonelite
athletes? Can performance variables such as strength, power,
endurance, and agility be trained at a level sufficient to make
one an elite athlete?
Successful performance in sport during childhood and
adolescence is affected by a wide range of physical and
physiologic factors that operate in a sport-specific manner.3
While training specific performance variables engenders future
success for some young children and adolescents,3,66 a more
comprehensive analysis insinuates that the interaction between
genetic and training factors promotes elite performance.88
OperatiOnal DefinitiOn
The studies analyzed used a wide array of definitions for
an elite athlete.8,20,26,29,34,63,80,82 For the endurance athlete,
the determination is even more complicated because of
the inconsistency in defining what variables (eg, anaerobic
threshold [AT], maximal oxygen uptake [VO2max]) determine
elite performance. For this article, an elite athlete is defined as
follows:
What Performance Characteristics
Determine Elite Versus Nonelite Athletes
in the Same Sport?
Daniel S. Lorenz, DPT, PT, LAT, CSCS, USAW,*
Michael P. Reiman, PT, DPT, OCS, SCS, ATC, FAAOMPT, CSCS, B.J. Lehecka, DPT,§
and Andrew Naylor, PT, DPT, SCS||
Context: There are significant data comparing elite and nonelite athletes in anaerobic field and court sports as well
as endurance sports. This review delineates specific performance characteristics in the elite athlete and may help guide
rehabilitation.
Evidence Acquisition: A Medline search from April 1982 to April 2012 was undertaken for articles written in English.
Additional references were accrued from reference lists of research articles.
Results: In the anaerobic athlete, maximal power production was consistently correlated to elite performance. Elite perfor-
mance in the endurance athlete is more ambiguous, however, and appears to be related to the dependent variable investi-
gated in each individual study.
Conclusion: In anaerobic field and court sport athletes, maximal power output is most predictive of elite performance. In
the endurance athlete, however, it is not as clear. Elite endurance athletes consistently test higher than nonelite athletes in
running economy, anaerobic threshold, and VO2max.
Keywords: elite versus nonelite athlete; performance characteristics; endurance athlete
[ Primary Care ]
From Specialists in Sports and Orthopedic Rehabilitation, Overland Park, Kansas, Duke University School of Medicine, Durham, North Carolina, §Wichita State University,
Wichita, Kansas, and ||Beacon Orthopaedics, Cincinnati, Ohio
*Address correspondence to Daniel S. Lorenz, DPT, PT, LAT, CSCS, USAW, Director of Physical Therapy, Specialists in Sports and Orthopedic Rehabilitation, 7381 W 133rd
St, Suite 302, Overland Park, KS 66213 (e-mail: danielslorenz@gmail.com).
The authors report no potential conflicts of interest in the development and publication of this manuscript.
DOI: 10.1177/1941738113479763
© 2013 The Author(s)
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vol. 5 • no. 6 SPORTS HEALTH
1. drafted or drafted in high rounds versus those undrafted or
drafted in later rounds;
2. perceived as having greater performance ability than that of
their peers in the same sport;
3. play at a higher level within a sport (division I vs II, profes-
sional vs amateur); and
4. for endurance, greater variables (eg, running economy, AT,
VO2max).
CharaCteristiCs Of anaerObiC fielD
anD COurt spOrt athletes
American football requires a variety of mental and physical
attributes to be successful. Elite American football players
typically possess superior anthropometric height and weight
measurements3 7,6 4 compared with nonfootball individuals. In
addition, they demonstrate a variety of physical performance
characteristics for numerous movement patterns. The National
Football League combine assesses 8 physical performance
tests.79 Despite the effort to choose athletes with the best
physical attributes, actual performance varies considerably.
A recent study examined the combine performance differences
between drafted and undrafted players.83 Players were divided
into 3 position groups: skill players (wide receivers, running
backs, and defensive backs), big skill players (fullbacks,
linebackers, tight ends, and defensive ends), and linemen
(centers, offensive tackles, offensive guards, and defensive
tackles). For skill players, those drafted performed significantly
better than nondrafted players on the 40-yard dash, vertical
jump height, proagility shuttle, and 3-cone drill.83 In the big
skill group, drafted players performed significantly better on the
40-yard dash and the 3-cone drill. Finally, the 40-yard dash, 225-
lb bench press test, and the 3-cone drill were significantly better
in the drafted versus undrafted linemen.
An evaluation of anatomic and physiologic characteristics
to determine those that best predict American football ability
found the only test that predicted football ability was the
Margaria-Kalamen power test (athlete propels up a flight of 12
stairs, 3 at a time, as quickly as possible), which also related to
a better 40-yard dash.4 In division I-A football, football playing
ability was significantly correlated with vertical jump for all
positions.80 A study of 46 college football players found that the
36.6-m sprint and 18.3-m shuttle run predicted football playing
ability, while physical characteristics such as height, weight,
and percentage body fat did not.26
Based on the available studies, it appears that regardless
of position, power, speed, and agility are most relevant to
actual performance in the National Football League, and
anthropometric characteristics such as height and weight are
less important.26,37,79,80,83 Interestingly, it is not known which
characteristics of undrafted or late-round picks indicate success
in American football.
Similar to American football, rugby requires a wide variety
of physical fitness qualities.8 To compete at a high level,
athletes must demonstrate tactical abilities in addition to
physical performance measures.8 Recent research compared
elite division I National Rugby League players with division II
state league rugby players.8 Twenty athletes from each league
were assessed on the basis of the 1-repetition squat maximum,
power output of a jump squat, 10-m and 40-m sprints, cone
agility drill, and sprint momentum (body mass × average
velocity during 10-m sprint test). Elite players were significantly
bigger (height, weight) and stronger (maximum strength) than
division II players. They were also significantly more powerful
(explosive). Increased size and strength allowed elite players
to produce greater momentum compared with their nonelite
peers. The findings suggest that lower body strength relative to
body mass is an indicator of success in rugby, as heavier, faster
players would be able to drive forward better and, conversely,
be able to repel their opponents drive forward.
Elite junior rugby players were compared with subelite players
across anthropometric and physical ability measures to analyze
predictors of tackling ability.32 Forty-one players were assessed
on the basis of height, weight, and skinfold measurements as
well as lower body muscular power. Each player performed
6 tackling drills and was evaluated by 2 expert coaches with
a standardized grading system. Elite players ranked better in
all anthropometric and physiologic measures. The strongest
individual predictors of tackling ability were acceleration
and lower extremity muscular power; acceleration alone was
predictive of tackling ability in a regression analysis.
The relationship among isokinetic knee strength, single-
sprint performance, and repeated-sprint ability in soccer and
rugby players found the strongest correlation between relative
knee extensor torque at 240° and the initial acceleration phase
(0-10 m) of the single-sprint performance. Results suggest that
factors other than strength (in this case, power) contribute to
repeated-sprint ability.67
Studies in other sports also highlight the relationship of
power to specific sport demands. In elite-level ice hockey
players, higher peak anaerobic power output is an important
predictor of higher round picks in all positions.20 Furthermore,
greater standing long jump distance was a significant predictor
for overall hockey potential. With regard to weight and playing
level, greater horizontal leg power (off-ice sprint and 3-hop
jump) was the best predictor of skating performance.29
In elite volleyball players, sport-specific jumps are directly
related to depth jump performance, indicating that the stretch-
shortening cycle and tolerance of high stretch loads are critical
to performance.82 In a study of elite Serbian basketball players,
anaerobic power was higher in the center position than in
guards and forwards.70
Acceleration (a critical component of sprinting) separates
elite athletes from their nonelite peers.8,3 4,37,63,79,83 Lacrosse,
soccer, and field hockey have similar characteristics to rugby
and football.63 Investigators analyzed sprinting ability in soccer
players with tests for power, strength, and leg stiffness to
differentiate elite from nonelite athletes.63 Subjects were divided
into 2 groups based on sprint speed. Faster accelerating
athletes demonstrated shorter ground contact times and higher
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Lorenz et al Nov • Dec 2013
step frequencies than the slower group. Higher strength and
power measures were also found in the faster group.
Success in sports requires a variety of physical factors that
many athletes strive to attain. While some variables, such
as ambition, drive, and mental toughness, are difficult to
quantify for research purposes, measures of height, mass,
strength, speed, acceleration, agility, and power are identifiable
and measureable. On multiple levels, physical performance
measures differentiate elite athletes from those who are
not.8,34,37,63,79,83 Unfortunately, success cannot be defined by
physical performance measures alone.
perfOrmanCe CharaCteristiCs Of
elite enDuranCe athletes
Several key physiologic and training variables correlate with elite
endurance performance, including VO2max, running economy,
AT, anthropometry, and an array of training characteristics, and
distinguish elite from nonelite endurance athletes.
Maximal Oxygen Uptake
VO2max is the maximum rate that oxygen can be taken from
ambient air and transported to cells for cellular respiration
during physical activity.40 VO2max in triathletes ranges from 39
to 49 mL/kg/min during tethered swimming,62,73 57 to 61 mL/
kg/min during cycle ergometry,68,71 ,72 and 61 to 85 mL/kg/min
during treadmill running.42 ,68 ,72,73 These variances allude to the
reality that variables correlated with endurance performance
are dependent on individual sports.
Genetic factors, in addition to environmental and training
factors, have an effect on an athlete’s VO2max. A study of 268
Bolivians concluded that 20% to 25% of the variability in
aerobic capacity at high altitude can be explained by genetic
factors. In 172 dizygotic and monozygotic twins, the genetic
effect for VO2max was 40%.17 Other studies suggest a genetic
contribution to VO2max and endurance running.84,8 8
VO2max measured via a crank arm ergometer and
tethered swimming showed weak correlations to triathlon
swimming.2 1, 27,7 3 More significant relationships have been
demonstrated between VO2max and cycling and total triathlon
time.62,68,72,91 Evidence indicates that factors such as thermal
regulation, fluid homeostasis, and energy balance have an
increasingly larger impact on performance than VO2max, as the
length of the triathlon increases.59
Elite marathon runners typically have VO2max values ranging
from 70 to 85 mL/kg/min.49 VO2max is considered a significant
physiologic determinant of middle- and long-distance running
performance.18,31,77 As such, VO2max has been used to predict the
upper limits of marathon performance.47,4 8 Moreover, VO2max
accounts for up to 59% of the variance in times for “top-class”
marathon runners.12 End-stage treadmill velocity in a VO2max
test also is a predictor of performance,25 and it may be the best
predictor of 5000-m performance in untrained and trained
individuals.86
While VO2max undoubtedly correlates with the performance
of endurance athletes, this association should be tempered
with the knowledge that maximal aerobic power may vary.73
The inability of VO2max to predict endurance sport performance
entirely necessitates inclusion of other physiologic variables,
such as running economy.48
Running Economy
Running economy (efficiency) is expressed as the steady-state
submaximal oxygen uptake at a given running velocity.48 The
lower the oxygen consumption at a given submaximal running
speed, the better the economy. A higher proportion of slow-
twitch fibers is associated with better running economy.16,50,8 9 A
study of collegiate cross-country team members discovered that
the combined analysis of a runner’s VO2max and running economy
could account for 92% of the variance in performance during
an 8000-m race.43 Running economy, like VO2max, has been used
to estimate a marathon pace in elite runners.47,4 8 However, male
marathon runners’ oxygen cost at marathon velocity may not
correlate with performance time.12 In fact, the average running
economy of 10 top-class marathoners (210 ± 12 mL/kg/km)
was significantly higher than that of 10 high-level marathoners
(195 ± 4 mL/kg/km).12 Therefore, running economy alone may
not be a conclusive predictor of elite endurance performance,
although it is undoubtedly correlated.
Anaerobic Threshold
While the VO2max of an endurance athlete separates elite from
nonelite athletes, the ability to sustain a high percentage
of VO2max is perhaps even more predictive of endurance
performance. This ability is related to the AT.22,91 AT is the
oxygen consumption during exercise, above which there is a
sharp increase in anaerobic energy production resulting in a
significant increase in lactic acid levels.22,91 Similar to VO2max,
genetic factors may have an impact on AT.36 Measures of ATs
during cycling for triathletes have ranged from 61% to 88%
of the VO2max.58,72 ,85, 91 An athlete’s AT is the greatest predictor
of race performance in endurance cycling14,22,23 and running
events.30,7 5,76,78 AT also correlates with triathlon performance
over Olympic distances.28,91 When each variable is examined
independently, AT is more telling of endurance performance
than VO2max or running economy.
Anthropometry
An endurance athlete’s anthropometric characteristics,
including body height, weight, and skinfold thickness, correlate
with performance.5,41 Body mass positively correlates with race
times for novice and experienced marathoners.39,41,51 Moreover,
low body fat percentages are associated with faster race
times.9,10,52,57 The mean percentage of body fat for elite female
and male runners combined is 8.0%, compared with 10.7% and
12.1% for “good” and “average” runners, respectively.9
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vol. 5 • no. 6 SPORTS HEALTH
Low measures of select skinfold thickness also correlate with
increased endurance performance.5,52 Elite endurance athletes
generally have a slim physique high in ectomorphy compared
with lower level athletes10 or sedentary groups.9 At the same
time, conflicting studies demonstrate no association between
anthropometry and endurance performances in recreational
ultratriathletes, recreational ultrarunners, and ultraendurance
cyclists.53,54
Training Characteristics
Several training characteristics predict endurance
performance.10,38,5 5,73 Among ultratriathletes, personal best
triathlon times correlate with future triathlon performance.54
Personal best marathon time, longest training session, training
intensity, and training volume all correlate with performance
in recreational ultrarunners.53 Training speed, frequency,
duration, and previous finishes in cycling marathons correlate
with performance in ultraendurance cyclists; training speed is
the most predictive variable.56 Moreover, several other studies
support the correlation between these training variables and
improved endurance performance.10,38 ,55,73
Highly competitive endurance athletes who perform
resistance training in addition to routine endurance training
demonstrate improved performance.90,98 Six or more weeks of
sport-specific, explosive resistance training or heavy weight
resistance training improves running economy by up to 8%
and performance in 3- and 5-km runs by 2.9%.90 Highly trained
cyclists can improve by implementing high-intensity explosive
resistance exercises.90 Resistance training enhances endurance
by transforming type IIb muscle fibers into type IIa muscle
fibers—a muscular adaptation also induced by endurance
training.87
The necessity for the inclusion of training parameters, such as
intensity, frequency, duration, and performance history, when
attempting to characterize endurance athletes is considerable.
Given the variability of VO2max, running economy, AT, and
anthropometric characteristics among high-level endurance
athletes, training parameters may be the most reliable
predictors of endurance performance. Furthermore, when
sport-specific, explosive resistance training is correlated with
increased endurance performance, an athlete’s muscular power
must be considered.
Elite East African Endurance Runners
In 2010, 41 of the 50 fastest marathons were run by Kenyans
or Ethiopians, and 84 of the top 100 competitive marathon
rankings were owned by Kenyan or Ethiopian runners in
2012.6 Genetic studies of elite African athletes do not show a
unique genetic makeup; however, environmental and social
factors likely play a role.81 Kenyan runners are from a distinct
environmental background (higher altitudes) and commute
farther by foot than other populations. A study within Kenya
discovered that a higher percentage of elite runners ran to
school each day (national athletes, 73%; international athletes,
81%; controls, 22%), in addition to covering greater distances.
Seventy-five percent of controls traveled fewer than 5 km to
school each day, compared with 49% of international athletes.69
East Africans possess several previously mentioned factors that
combine to create an elite endurance athlete: sizeable VO2max,
running economy, and ideal anthropometric characteristics.60
COnClusiOn
Defining elite performance remains elusive owing to the
wide array of descriptors utilized. No single characteristic
has been defined as the main predictor of performance
in elite endurance athletes. Elite athletes in anaerobic
sports are more powerful and explosive than their
counterparts.4,8,26,30,34,37,63,67,79,80,82,83 The focus of performance
training in the anaerobic athlete should be on increasing
power production, which has a direct correlation with speed
and agility. Physical characteristics such as height, weight,
percentage body fat, and flexibility are not as important in
athletic performance.4,26,37,79,80,83
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... 6,9,11,12 There are known differences in sub-elite/elite and recreational runners, such as training methods (e.g., technique, available training time, resources, injury prevention, motivation, to name a few), physiological (e.g., running performance parameters, genetics, anthropometrics) and psychological (e.g., running and competing motivations) outcome measures. 1,[29][30][31][32] Further, within recreational runners themselves there are also known differences in training methods (e.g., periodization strategies, use of resistance training, etc.), running performance outcomes (e.g., aerobic/anaerobic capacity, running mechanics and economy, etc.), motivations (e.g., race for health, leisure, or performance), and also other important factors like sex and age. 1,2,30,32,33 In the only two studies to examine recreational runners, both found significant relationships between lower-limb flexibility and running performance when looking at combined male and female participants overall 7 or in male participants only. ...
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In brief: To examine the relationship between actual performance times and predicted marathon times calculated from running velocity at the anaerobic threshold (AT), 18 male subjects ran on a treadmill to volitional fatigue. The AT was determined by examining the excess CO2 elimination curve. The subjects' average velocity at the AT was 9.22 mph. The average predicted time was 2:53:49, while the average marathon time was 2:52:06. There was a highly significant correlation between the predicted and actual marathon times (r =.94, p <.01). This relationship suggests that running velocity at the AT may be critical in determining efficient running speed during marathons.
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The use of strength training designed to increase underlying strength and power qualities in elite athletes in an attempt to improve athletic performance is commonplace. Although the extent to which strength and power are important to sports performance may vary depending on the activity, the associations between these qualities and performance have been well documented in the literature. The purpose of this review is to provide a brief overview of strength training research to determine if it really helps improve athletic performance. While there is a need for more research with elite athletes to investigate the relationship between strength training and athletic performance, there is sufficient evidence for strength training programs to continue to be an integral part of athletic preparation in team sports.