Spring 2015, Volume 3 - Number 9 (4 صفحه - از 93 تا 96)
"c om ISSN (Online): 2322 – 4479 Comparisons of EMG Activity of Rectus Femoris and Vastus Medialis in Different Phases of Squat 1Sepide Khamoushi∗ ,2Nader Farahpour, 3Shirin Yazdani 1. Department of Physical Education and Sport Science, Tabriz University, Tabriz, Iran INTRODUCTION Information obtained from muscle EMG may help us to evaluate muscle activity, effectiveness of a specific rehabilitation program, as well as for understanding the injury mechanism(3). The objective of this study was to assess the EMG activity of vastus medialis and rectus femoris muscles during their concentric and eccentric contractions. EMG activity of vastuslateralis and rectus femuris muscles were digitized during squat performance with a load equal to 45% of body mass. The intensity of muscle activity was shown in two phases sitting (eccentric contraction) and standing (concentric contraction) in squat exercise. CONCLUSIONS The activity of vastus medialis in standing phase was significantly greater than that of the rectus femoris muscle(1,4)."
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It is observed that the activity of vastus medialis in standing phase was about 1.59% greater than
that of rectus femoris muscle (P<0.05). Overall vastus medialis displayed about 33% greater activity than rectus femoris muscle.
Figure 1. The intensity of muscle activity was shown in two phases sitting (eccentric contraction) and standing (concentric contraction) in squat exercise. Also in sitting phase, there was not significantly difference between the intensity of VM and RF muscle activation (p=0.13) but in standing phase the intensity of VM muscle activity was 1.6 times higher than that of RF muscle activity (p=0.002).
The activity of vastus medialis in standing phase was significantly greater than that of the rectus
femoris muscle(1,4). It seems that vastudmedialis rather than extension power, generate some forces for stability of the patella itself which is important action to prevent it from injury.
1- Hamill, J., & Knutzen, K. M Biomechanical basis of human movement. Lippincott Williams & Wilkins;
2- Escamilla, RF, Fleisig, GS, Zheng, N, Lander, JE, Barrentine, SW, Andrews, JR, Bergemann, BW, and Moorman, CT 3rd. The effects of technique variations on knee biomechanics during the squat and leg press. Med Sci Sports Exerc.2001; 33: 1552–1566.
3- Ann-Katrin Sten dotter , Paul Hodges , Fredrik h berg & Charlotte Hger-Ross Quadriceps EMG in Open and
Closed Kinetic Chain Tasks in Women With Patellofemoral Pain, Journal of Motor Behavior, 2007. 39:3, 194-
202, DOI: 10.3200/JMBR.39.3.194-202
4- Pincivero, D.M., Gandhi, V., Timmons, M.K., Coelho, A.J. Quadriceps femoris electromyogram during concentric, isometric and eccentric phases of fatiguing dynamic knee extensions. Journal of Biomechanics .,
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