The impact of load and base of support on electromyographic onset in the shoulder muscle during push-up exercises

Summary Objective To investigate the effects of base of support (BOS) and external loads on electromyographic (EMG) onset in the shoulder muscles during push-up exercises. Methods Two levels of external load were applied at two levels of BOS stability during push-up exercises. EMG onset in six shoul...

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Bibliographic Details
Published in:Journal of bodywork and movement therapies 2013-04, Vol.17 (2), p.192-199
Main Authors: Vaseghi, Bita, Ph.D, Jaberzadeh, Shapour, PhD, GCHPE, Kalantari, Khosro Khademi, Ph.D, Naimi, Sedigheh Sadat, Ph.D
Format: Article
Language:English
Subjects:
Adolescent
Adult
Base of support
Deltoid Muscle - physiology
Electromyography
Electromyography - methods
Electromyography - standards
Exercise - physiology
Female
Humans
Load
Male
Muscle, Skeletal - physiology
Onset time
Physical Medicine and Rehabilitation
Posture - physiology
Reproducibility of Results
Shoulder
Shoulder - physiology
Shoulder Joint - physiology
Weight-Bearing - physiology
Young Adult
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Summary:Summary Objective To investigate the effects of base of support (BOS) and external loads on electromyographic (EMG) onset in the shoulder muscles during push-up exercises. Methods Two levels of external load were applied at two levels of BOS stability during push-up exercises. EMG onset in six shoulder muscles was measured in 30 healthy participants. Results With load set at 4% of body weight (BW), EMG onset in the lower trapezius (LT) ( P  = 0.003) and biceps brachia (BB) ( P  = 0.001) was significantly decreased with no load. Conversely, in other muscles (the upper trapezius (UT), teres major (TM), seratus anterior (SA) and deltoid posterior (DP)), time to EMG onset did not change significantly. No significant changes in EMG onset were observed with load at 2% of BW. The average time to EMG onset was significantly decreased for different stages of BOS instability in the LT ( P  = 0.04) and UT ( P  = 0.001). Conclusion Both load and BOS instability reduce time to EMG onset, but BOS instability produces greater reductions.
ISSN:1360-8592
1532-9283
DOI:10.1016/j.jbmt.2012.06.006