Content uploaded by Ronny Bergquist
Author content
All content in this area was uploaded by Ronny Bergquist on May 01, 2018
Content may be subject to copyright.
Journal of Human Kinetics volume 61/2018, 5-13 DOI: 10.1515/hukin-2017-0137 5
Section I – Kinesiology
1 - Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology.
2 - Department of Public Health and General Practice, Norwegian University of Science and Technology.
3 - Department of Physical Medicine and Rehabilitation, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.
.
Authors submitted their contribution to the article to the editorial board.
Accepted for printing in the Journal of Human Kinetics vol. 61/2018 in March 2018.
Muscle Activity in Upper-Body Single-Joint Resistance Exercises
with Elastic Resistance Bands vs. Free Weights
by
Ronny Bergquist1, Vegard Moe Iversen2, Paul J Mork2, Marius Steiro Fimland1, 3
Elastic resistance bands require little space, are light and portable, but their efficacy has not yet been
established for several resistance exercises. The main objective of this study was to compare the muscle activation levels
induced by elastic resistance bands versus conventional resistance training equipment (dumbbells) in the upper-body
resistance exercises flyes and reverse flyes. The level of muscle activation was measured with surface electromyography
in 29 men and women in a cross-over design where resistance loadings with elastic resistance bands and dumbbells
were matched using 10-repetition maximum loadings. Elastic resistance bands induced slightly lower muscle activity
in the muscles most people aim to activate during flyes and reverse flies, namely pectoralis major and deltoideus
posterior, respectively. However, elastic resistance bands increased the muscle activation level substantially in perceived
ancillary muscles, that is deltoideus anterior in flyes, and deltoideus medius and trapezius descendens in reverse flyes,
possibly due to elastic bands being a more unstable resistance modality. Overall, the results show that elastic resistance
bands can be considered a feasible alternative to dumbbells in flyes and reverse flyes.
Key words: electromyography, resistance training, pectoralis muscles, deltoid muscle.
Introduction
Regular resistance training provides
several health benefits (Chodzko-Zajko et al.,
2009; Kristensen and Franklyn-Miller, 2012;
Williams et al., 2007). However, limitations
associated with conventional resistance training
equipment might restrain therapists, patients and
the general population from using this form of
exercise. Barbells, dumbbells, weight-plates and
resistance training machines are heavy, stationary
and require space. Moreover, many people do not
have the interest or opportunity to exercise at a
fitness center.
An alternative way of performing
resistance training is by using elastic bands, which
require little space and are light and portable.
When barbells, dumbbells or conventional
training machines are used, external resistance
does not change during the range of motion,
while elastic resistance provided by elastic bands
will increase with elongation of the band
(Patterson et al., 2001).
Several studies have used surface
electromyography (EMG) to compare muscle
activation in resistance exercises using both elastic
and conventional resistance. Some of these
suggest that when relative resistance is matched –
the same percentage of one-repetition maximum -
similar levels of muscle activation can be achieved
for the prime movers (Aboodarda et al., 2011;
Andersen et al., 2010; Brandt et al., 2013;
Calatayud et al., 2014; Jakobsen et al., 2012;
Jakobsen et al., 2014), whereas others have found
conventional resistance to be the favorable
modality (Sundstrup et al., 2014; Vinstrup et al.,
2015; Vinstrup et al., 2015).
The muscular activation patterns have
been found to differ between elastic bands and
conventional resistance training exercises, with
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
6 Muscle activity in upper-body single-joint resistance exercises with elastic resistance bands vs. free weights
Journal of Human Kinetics - volume 61/2018 http://www.johk.pl
higher muscle activity for conventional and elastic
resistance in different phases of the contraction.
Generally, muscle activity induced by
conventional equipment is higher than from
elastic resistance early in the concentric phase of
the contraction, while towards the end – when the
band is elongated - muscle activity levels are more
similar. However, this is affected by the “sticking
point” of the exercise in question. The sticking
point is commonly known as the point in the
range-of-motion (ROM) where one experiences a
disproportionally large increase in the difficulty to
complete the movement (van den Tillaar and
Ettema, 2009), and is the performance bottleneck
in a resistance exercise (Kompf and Arandjelovic,
2016). In movements where the sticking point
occurs in the early phase of the concentric ROM
with conventional resistance one might assume
that the sticking point occurs later in the
movement phase with elastic bands, due to the
gradually increasing external resistance, but to
our knowledge this has not been experimentally
verified.
This study compares the single-joint flyes
and reverse flyes exercises using dumbbells
versus elastic bands. The fly primarily targets
muscles in the chest, while reverse flyes primarily
targets the posterior shoulder muscles.
Furthermore, the fly is an exercise where the
sticking point is early in the concentric phase with
dumbbells, due to the high leverage created by
the arms in this position. For reverse flyes the
sticking point will occur towards the end of the
concentric ROM for both dumbbells and the
elastic band, as the leverage will be highest here.
Thus, we hypothesized that overall EMG levels
would be comparable between the modalities, yet
higher EMG levels would be induced by elastic
bands than dumbbells in the late concentric and
early eccentric phase in flyes, but not in reverse
flyes where we expected similar activation for
dumbbells and elastic bands throughout the
movement.
Methods
Participants
Twenty-nine healthy subjects including 17
men (age 26 ± 3 years, body height 180 ± 7 cm,
body mass 75.6 ± 11.2 kg) and 12 women (age 25 ±
2 years, body height 168 ± 7 cm, body mass 60.2 ±
7.4 kg) were enrolled in the study. Ten of the
participants reported to have previous experience
with structured strength training. The study
conformed to the Declaration of Helsinki and the
study protocol was approved by the Regional
Committee for Medical and Health Research
Ethics in central Norway (project no: 2014/1157).
All subjects signed informed consent before
participating in the study.
Measures
10-RM
All participants attended two
familiarization and strength assessment sessions.
In these sessions, they performed a 10-RM test
protocol, where we identified the load the
participants were able to perform 10 repetitions
with but not more, in order to match the load
from the elastic bands with that of the dumbbells
for subsequent muscle activation comparisons.
EMG
EMG signals were sampled using self-
adhesive, gel-coated electrodes with a centre-to-
centre distance of 25 mm (Blue Sensor, M-00-S,
Ambu A/S, Ballerup, Denmark). Before electrode
placement, the skin was abraded and washed
with alcohol. Electrodes were placed on the
participant’s dominant side, and placement
followed Surface ElectroMyoGraphy for the Non-
Invasive Assessment of Muscles (SENIAM)
recommendations (http://www.seniam.org). For
the pectoralis major, the electrodes were placed ~4
cm medial to the axillary fold (Schick et al., 2010),
and for the latissimus dorsi, the electrodes were
placed ~1 cm lateral to the inferior border of the
scapula (Lehman et al., 2004). The EMG signal
was recorded through shielded wires to the EMG
system (MuscleLab 4020e, Ergotest Technology
AS, Langesund, Norway). A pre-amplifier near
the recording site was used to minimize external
noise, with a common mode rejection ratio of 100
dB. The signal was filtered using a fourth-order
Butterworth band-pass filter with a bandwidth of
8-600 Hz. A hardware circuit network was used to
convert the filtered EMG signals, with a frequency
response of 0-600 kHz, averaging constant of 100
ms, and total error of ±0.5%. The root-mean-
square (RMS) signal was then sampled at 100 Hz
with a 16-bit A/D converter (AD637).
EMG was recorded during the exercises
and maximal voluntary isometric contractions for
the following muscles: biceps brachii, deltoideus
anterior, deltoideus medius, deltoideus posterior,
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
by Ronny Bergquist et al. 7
© Editorial Committee of Journal of Human Kinetics
trapezius descendens, latissimus dorsi, and
pectoralis major. The procedure for maximal
voluntary contraction testing was standardized,
and two tests were performed for each muscle.
Participants were instructed to gradually increase
force to a maximal level within 2-3 s and exert
maximal force until told to stop. Each test lasted 5
s. Standardized strong verbal encouragement was
given to all participants. A second maximal
voluntary contraction was performed 1 min after
ending the first one, and the test with the highest
recorded EMG signal for each muscle was used
for normalization of the EMG signals during the
exercises.
To measure EMG in the different phases
of contraction, a linear encoder was used and
synchronized with the EMG signals (sampling
frequency of 100 Hz, resolution of 0.075 mm; ET-
Enc-02, Ergotest Technology AS, Langesund,
Norway). The linear encoder was placed on the
floor during flyes and reverse flyes when
performed with free-weight resistance. During
flyes and reverse flyes performed with elastic
resistance, the linear encoder was attached to the
wall close to the attachment point of the elastic
band.
Commercial software was used for
analyzing the RMS EMG and position signals
(MuscleLab v8.13, Ergotest Technology AS,
Langesund, Norway). The start and the end of
each contraction was identified from the position
data. The range of motion of 10-90% in the
concentric and eccentric phases was used in EMG
analysis. This time window was then split in two
equal phases constituting the first and the second
half of the concentric (denoted as CON1 and
CON2) and eccentric (denoted as ECC1 and
ECC2) phase of a contraction. Mean RMS EMG
values in these time windows were calculated and
averaged from two contractions in each series of
three. For the concentric phase, the last two
contractions were used, while for the eccentric
phase the first two contractions were considered.
The reason for such proceeding was that the
start/stop point was difficult to identify in the
concentric and eccentric phase of the first and last
repetition, respectively. The mean RMS EMG
obtained during CON1, ECC1, CON2, and ECC2
was then normalized to the maximal EMG signal
obtained during the maximal voluntary
contraction tests for all muscles, yielding
%EMGmax.
Rating of perceived exertion
Before testing, the participants were
explained how to use the Borg CR10 scale
(Saeterbakken and Fimland, 2013). Immediately
after performing 10-RM, the participants were
asked to rate their perceived exertion. It had
previously been demonstrated that a moderate to
strong relation existed between ratings on the
Borg CR10, actual loading, and muscle activity
levels from elastic bands and dumbbells
(Andersen et al., 2010).
Procedures
All participants attended four sessions in
total. The 10-RM protocol was performed in
session one and two, using elastic bands on one
day and dumbbells the other day. The
participants were instructed to abstain from
strength exercise for at least three consecutive
days before the 10-RM tests. Prior to the 10-RM
test, a demonstration of correct execution was
given, and the participants practiced the
technique until it could be performed properly.
Subsequently, the load was gradually increased.
Before making larger increments, at least two sets
at relatively low resistance had to be performed.
To avoid muscle fatigue, participants were
encouraged to stop if the load felt easy enough to
perform more than 10 repetitions. With elastic
resistance, the load was manipulated by changing
and/or increasing the number of bands and/or by
changing the distance between the participant and
the anchor point. The combination of bands and
distance was recorded for all participants so that
the load could be replicated for the EMG and
motion sampling. As the manufacturer
recommended, the elastic bands were pre-
stretched and never stretched to >300% of resting
length.
In sessions three and four, the participants
performed maximum voluntary contractions,
before proceeding with EMG measurements
during exercise. As a warm-up, they performed a
set of 10 repetitions at 50% of the 10-RM load. A
linear encoder was attached to the participants’
dominant hand, and the metronome was set to 60
beats per minute. Participants then performed
three repetitions with the 10-RM load, using 2 s
each on the concentric and eccentric phase. Flyes
were tested before reverse flyes, and exercises
with dumbbells were performed before the ones
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
8 Muscle activity in upper-body single-joint resistance exercises with elastic resistance bands vs. free weights
Journal of Human Kinetics - volume 61/2018 http://www.johk.pl
with elastic bands. When performing flyes and
reverse flyes with dumbbells, the participant lay
on a bench (Impulse Sterling FID bench, Impulse
Fitness, Newbridge, Midlothian, Scotland). The
dumbbells used were rubber coated iron
dumbbells ranging from 1 to 25 kg, with intervals
of 1 kg from 1 to 10 kg, and of 2.5 kg from 10 to 25
kg. TheraBand® elastic bands and TheraBand®
exercise handles were used as elastic resistance
(Hygenic Corporation, Akron, OH, USA). Levels
of resistance used were indicated by different
colours i.e. yellow, red, green, blue, black, silver
and gold, which at 200% elongation corresponded
to 2, 2.5, 3, 3.9, 4.6, 6.9 and 9.5 kg, respectively. A
metronome application on a smartphone was
used to standardize the lifting time.
In flyes, the participant lay on the bench
in a supine position, holding one dumbbell in
each hand with arms erect in a straight vertical
line towards the ceiling. The participants were
instructed to keep their elbows slightly bent
throughout the movement. When starting, the
dumbbells were lowered in an arc to the sides and
the movement stopped when the upper arms
were parallel to the floor. The dumbbells were
then returned to the starting position.
Elastic bands were attached to a wall-bar
at shoulder height. Handles were connected to
each end of the band, and the participant started
the exercise facing away from the wall-bar, in a
position where the arms were kept extended in a
forward horizontal line, while leaning the upper
body slightly forward for balance. The non-
dominant foot was placed in front of the other for
support. With slightly bent elbows, the arms were
then moved out in an arc to the sides until the
upper arms formed a straight line through the
torso. The movement was completed by pressing
the handles toward each other.
For reverse flyes, the participant lay on
the bench in a prone position, with one dumbbell
in each hand, keeping the arms erect in a straight
vertical line towards the floor. The participants
were instructed to keep their elbows slightly bent
throughout the movement. The movement started
by lifting the dumbbells in an arc out to the sides,
returning them when the upper arms were
elevated to a position parallel to the floor.
Elastic bands were attached to a wall-bar
at shoulder height. Handles were connected to
each end of the band, and the participant started
the exercise while facing the wall-bar with arms in
a forward horizontal line, parallel to the floor. The
handles were then pulled in an arc out to the sides
until the upper arms formed a straight line
through the torso. The handles were then
returned to the starting position. Elbows were
slightly bent throughout the movement.
Statistical analyses
Statistical analyses were performed using
SPSS for Windows (v. 21.0). A two-way (2x4)
repeated measures analysis of variance (ANOVA)
was used to assess the effect of the exercise
modality (elastic band vs. dumbbells) and
interaction with the contraction phase (CON1,
CON2, ECC1, and ECC2) on muscle activity.
Significant interaction effects were investigated
within the concentric and eccentric phases, i.e.,
between CON1 and CON2, and ECC1 and ECC2,
respectively. When significant main effects or
interactions were detected (p < 0.05), post-hoc tests
were performed within each contraction phase to
assess differences in muscle activity between
dumbbells and elastic bands. For post hoc tests, p-
values lower than 0.01 were considered
significant, and p-values up to 0.05 were
considered trends toward significance to account
for multiple testing. The dependent variable was
%EMGmax. For the rating of perceived loading on
the Borg CR10 scale, a paired samples t-test was
used and a p-value of 0.05 was considered
significant. The data was checked for normality
with a Shapiro-Wilk test. A log transformation
was performed on all EMG variables.
Results
For flyes, there were significant main
effects of the exercise modality on muscle activity
levels for all muscles (p ≤ 0.026 for all
comparisons) and also significant interactions
between muscle activity and the exercise modality
in both the concentric and eccentric phases (p ≤
0.001 for all comparisons). For the pectoralis
major, muscle activity was highest when using
dumbbells, whereas for the deltoideus anterior,
biceps brachii and latissimus dorsi, elastic bands
induced the highest levels of muscle activity.
Figure 3 shows results of post hoc comparisons
for muscle activity in the different contraction
phases of flyes with elastic bands versus
dumbbells.
For reverse flyes, there were significant
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
by Ronny Bergquist et al. 9
© Editorial Committee of Journal of Human Kinetics
main effects of the exercise modality on muscle
activity levels for all muscles (p ≤ 0.001 for all
comparisons). Significant interactions were found
for the deltoideus medius and trapezius
descendens in both the concentric and eccentric
phase (p ≤ 0.011 for both comparisons). Higher
muscle activity was observed when using elastic
resistance compared to free-weight resistance for
the trapezius and deltoideus medius. In contrast,
the deltoideus posterior and latissimus dorsi
displayed higher muscle activity when using free-
weight resistance. Figure 4 shows results of post
hoc comparisons for muscle activity in the
different contraction phases of reverse flyes with
elastic bands versus dumbbells.
Table 1 shows the perceived exertion rated on
the Borg CR10 scale after performing the 10-RM
tests with elastic bands and dumbbells. Elastic
bands were rated heavier compared to dumbbells
for both flyes and reverse flyes; yet statistical
significance was only reached for reverse flyes.
Figure 1
Start- and end position of flyes with elastic bands (A) and dumbbells (B)
Figure 2
Start- and end position of reversed flyes with elastic bands (A) and dumbbells (B).
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
10 Muscle activity in upper-body single-joint resistance exercises with elastic resistance bands vs. free weights
Journal of Human Kinetics - volume 61/2018 http://www.johk.pl
Figure 3
EMG data for flyes with elastic bands and dumbbells in the first and second half of the concentric
(CON1 and CON2) and eccentric (ECC1 and ECC2) phases for the pectoralis major
(A), deltoideus anterior (B), biceps brachii (C) and latissimus dorsi
(D). Means and standard deviations. * p ≤ 0.01; # p ≤ 0.05
Figure 4
EMG data for reverse flyes with elastic bands and dumbbells in the first and second half of the concentric
(CON1 and CON2) and eccentric phases (ECC1 and ECC2) for the deltoideus posterior
(A), trapezius descendens (B), deltoideus medius (C), and latissimus dorsi
(D). Means and standard deviations. * p ≤ 0.01; # p ≤ 0.05
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
by Ronny Bergquist et al. 11
© Editorial Committee of Journal of Human Kinetics
Table 1
Perceived exertion rated on the Borg CR10 scale after performing the 10-RM tests with elastic
and free-weight resistance. Values are mean (SD).
Exercises Elastic Free-weight p-value
Flyes 8.2 (1.2) 7.8 (1.3) 0.073
Reversed flyes 7.9 (1.4) 7.1 (1.9) 0.040
Discussion
The main objective of this study was to
assess differences in muscle activity levels
induced by elastic bands and dumbbells in flyes
and reverse flyes. In flyes, elastic bands generally
induced lower levels of muscle activation for the
pectoralis major than dumbbells, but higher for
the deltoideus anterior. In reverse flyes, elastic
bands generally induced lower levels of muscle
activation for the deltoideus posterior, but higher
for the deltoideus medius and trapezius
descendens.
Flyes are primarily used to target chest
muscles. Overall, dumbbells were slightly more
effective for this muscle group. However, the
results showed that elastic bands activated the
deltoideus anterior substantially more, and that
flyes, performed with elastic bands in particular,
could be effectively used to train the deltoideus
anterior as well.
Partly in accordance with our expectation
that higher EMG levels would be induced during
exercises with elastic bands than dumbbells in the
end ranges in flyes, muscle activity for the
pectoralis major in flyes was lower with elastic
bands in CON1 and ECC2, but higher in CON2,
and similar in ECC1. This may be explained by
the very high leverage provided by dumbbells in
the beginning of the concentric phase. When the
sticking point is passed, a pronounced decline in
muscle activity is seen for dumbbells. In contrast,
muscle activity induced during exercises with
elastic bands increases from the beginning
towards the end of the range of motion, mirroring
the increasing external resistance caused by
elongation of the band. In ECC1 there was no
difference between the modalities, whereas when
the dumbbells were lowered out to the sides in
ECC2, the dumbbells again induced a higher
pectoralis major activation level.
Reverse flyes are primarily utilized for
deltoideus posterior training. Overall, dumbbells
were slightly more effective in activating this
muscle, more or less in all phases of the
contraction. However, the activation level of the
deltoideus medius and trapezius descendens
during exercises with elastic bands was
substantially higher than with dumbbells, and
reverse flyes with elastic bands appear to be a
very effective exercise for these muscles. As
expected, when the sticking point occurred at the
end of the concentric range of motion for both
elastic bands and dumbbells, we did not observe
the differential development in reverse flyes for
the deltoideus posterior that we observed in flyes
for the pectoralis major, in which the sticking
point was in the early concentric phase (Figure 3A
and 4A).
A similar pattern was observed from both
single-joint exercises in the sense that elastic
bands were slightly less effective in activating the
muscles usually perceived to be the prime movers
(i.e. pectoralis major for flyes and deltoideus
posterior for reverse flyes). However, elastic
bands induced substantially higher activation
levels in muscles perceived to be ancillary. It
could be that performing these exercises with
elastic bands instead of dumbbells made them
more unstable. Increased stability requirement
could possibly elicit higher neural drive to
stabilize the shoulder joint, which had been
suggested previously for dumbbells versus the
barbell chest press (Saeterbakken et al., 2011).
However, it is also possible that the different
postures contributed to these effects, as
participants were lying on a bench when the
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
12 Muscle activity in upper-body single-joint resistance exercises with elastic resistance bands vs. free weights
Journal of Human Kinetics - volume 61/2018 http://www.johk.pl
exercises with dumbbells were performed, but
standing during execution with elastic bands,
which is another way of inducing higher
instability and to increase muscle activation of the
deltoideus anterior (Saeterbakken and Fimland,
2013)
The increased stability requirement
possibly induced by a standing posture, involving
more stabilizing muscles, could also explain why
higher ratings of perceived effort on the Borg
CR10 scale were reported for elastic bands
compared to dumbbells. Partly in agreement with
our finding, Jakobsen and coworkers found a
higher rating of perceived effort when performing
knee flexions with elastic bands versus a
conventional training machine (Jakobsen et al.,
2014).
A limitation of this study is the use of
EMG to measure dynamic contractions. The
interpretation of the EMG signal during
movement can be complicated by issues such as
signal nonstationarity, the relative shift of the
electrodes, and fluctuations in conductivity
properties of the skin (Farina, 2006). Importantly,
the EMG measurements were performed in the
same session, thus there was no need to replace
electrodes. Furthermore, we measured EMG on
one side of the body only. In our study, we used
an 8-channel EMG system, so measuring on one
side only allowed us to measure more muscles at
the same time. The decision to measure the
dominant vs. non-dominant side was arbitrary.
However, we do not expect that the activation
patterns would be different on the non-dominant
side.
Another limitation is the 10-RM protocol
used for matching the loads between the
modalities. It is challenging to find the true 10-
RM, particularly with elastic bands. However, the
test leader was experienced in resistance training,
ensuring that 10-RM could be identified within 5
attempts and we are unaware of a better
procedure to match relative resistance.
Furthermore, to fine-tune resistance with elastic
bands, it was necessary to change the distance
between the participant and the anchor point
individually. Hence, we are unable to report a
standardized pre-stretch of the elastic bands for
each exercise.
In conclusion, elastic resistance bands
induced slightly lower muscle activity in the
muscles most people aim to activate during flyes
and reverse flyes, i.e., pectoralis major and
deltoideus posterior, respectively. However,
elastic resistance bands increased the muscle
activation level substantially in the deltoideus
anterior in flyes, and deltoideus medius and
trapezius descendens in reverse flyes, possibly
due to elastic bands being a more unstable
resistance modality.
Acknowledgements
The authors thank the participants for their enthusiastic contribution to the study, and Xiangchun Tan
and Alan K. Bourke for assisting in data processing. There are no known conflicts of interest that the authors
are aware of. This study was in part supported by a grant from KLP (Kommunal landspensjonskasse),
Norway.
References
Aboodarda SJ, Shariff MA, Muhamed AM, Ibrahim F, Yusof A. Electromyographic activity and applied load
during high intensity elastic resistance and nautilus machine exercises. J Hum Kinet, 2011; 30: 5-12
Andersen LL, Andersen CH, Mortensen OS, Poulsen OM, Bjornlund IB, Zebis MK. Muscle activation and
perceived loading during rehabilitation exercises: comparison of dumbbells and elastic resistance.
Phys Ther, 2010; 90: 538-549
Brandt M, Jakobsen MD, Thorborg K, Sundstrup E, Jay K, Andersen LL. Perceived loading and muscle
activity during hip strengthening exercises: comparison of elastic resistance and machine exercises. Int
J Sports Phys Ther, 2013; 8: 811-819
Calatayud J, Borreani S, Colado JC, Martin F, Tella V, Andersen LL. Bench press and push-up at comparable
levels of muscle activity results in similar strength gains. J Strength Cond Res, 2014,
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
by Ronny Bergquist et al. 13
© Editorial Committee of Journal of Human Kinetics
10.1519/jsc.0000000000000589246-253
Chodzko-Zajko WJ, Proctor DN, Fiatarone Singh MA, Minson CT, Nigg CR, Salem GJ, Skinner JS. American
College of Sports Medicine position stand. Exercise and physical activity for older adults. Med Sci
Sports Exerc, 2009; 41: 1510-1530
Farina D. Interpretation of the Surface Electromyogram in Dynamic Contractions. Exercise and Sport Sciences
Reviews, 2006; 34: 121-127
Jakobsen MD, Sundstrup E, Andersen CH, Bandholm T, Thorborg K, Zebis MK, Andersen LL. Muscle
activity during knee-extension strengthening exercise performed with elastic tubing and isotonic
resistance. Int J Sports Phys Ther, 2012; 7: 606-616
Jakobsen MD, Sundstrup E, Andersen CH, Persson R, Zebis MK, Andersen LL. Effectiveness of hamstring
knee rehabilitation exercise performed in training machine vs. elastic resistance: electromyography
evaluation study. Am J Phys Med Rehabil, 2014; 93: 320-327
Kompf J, Arandjelovic O. Understanding and Overcoming the Sticking Point in Resistance Exercise. Sports
Med, 2016; 46: 751-762
Kristensen J, Franklyn-Miller A. Resistance training in musculoskeletal rehabilitation: a systematic review. Br
J Sports Med, 2012; 46: 719-726
Patterson RM, Stegink Jansen CW, Hogan HA, Nassif MD. Material properties of Thera-Band Tubing. Phys
Ther, 2001; 81: 1437-1445
Saeterbakken AH, Fimland MS. Effects of body position and loading modality on muscle activity and
strength in shoulder presses. J Strength Cond Res, 2013; 27: 1824-1831
Saeterbakken AH, van den Tillaar R, Fimland MS. A comparison of muscle activity and 1-RM strength of
three chest-press exercises with different stability requirements. J Sports Sci, 2011; 29: 533-538
Sundstrup E, Jakobsen MD, Andersen CH, Bandholm T, Thorborg K, Zebis MK, Andersen LL. Evaluation of
elastic bands for lower extremity resistance training in adults with and without musculo-skeletal pain.
Scand J Med Sci Sports, 2014; 10.1111/sms.12187353-359
van den Tillaar R, Ettema G. A comparison of successful and unsuccessful attempts in maximal bench
pressing. Med Sci Sports Exerc, 2009; 41: 2056-2063
Vinstrup J, Calatayud J, Jakobsen MD, Sundstrup E, Jay K, Brandt M, Zeeman P, Jorgensen JR, Andersen LL.
Electromyographic comparison of elastic resistance versus machine exercise for high-intensity
strength training in chronic stroke patients. Arch Phys Med Rehabil, 2015;
10.1016/j.apmr.2015.10.099429-436
Vinstrup J, Sundstrup E, Brandt M, Jakobsen MD, Calatayud J, Andersen LL. Core Muscle Activity, Exercise
Preference, and Perceived Exertion during Core Exercise with Elastic Resistance versus Machine.
Scientifica (Cairo), 2015; 10.1155/2015/403068403068
Williams MA, Haskell WL, Ades PA, Amsterdam EA, Bittner V, Franklin BA, Gulanick M, Laing ST, Stewart
KJ. Resistance exercise in individuals with and without cardiovascular disease: 2007 update: a
scientific statement from the American Heart Association Council on Clinical Cardiology and Council
on Nutrition, Physical Activity, and Metabolism. Circulation, 2007; 116: 572-584
Corresponding author:
Ronny Bergquist
NTNU, Fakultet for medisin og helsevitenskap,
PB 8905, 7491 TRONDHEIM
Phone: 0047 72571259
E-mail: ronny.bergquist@ntnu.no
Brought to you by | NTNU University Library
Authenticated
Download Date | 4/26/18 10:52 AM
