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KMID : 1151220130190020055
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Journal of Korean Academy of Orthopedic Manual Therapy
2013 Volume.19 No. 2 p.55 ~ p.60
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Comparison of Low Limb Muscle Activity during Squat Exercise according to Hip Joint Flexion Angle
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Min Dong-Gi
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Abstract
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Background: The purpose of this study was to determine if there is a difference in activation of the rectus femoris, vastus medialis oblique, vastus lateralis, semitendinosus, and biceps femoris when performing normal free squat with standinding position and free squat with 30’ flexed hip joint.
Methods: Electromyograph surface electrodes were placed on the rectus femoris, vastus medialis oblique, vastus lateralis, semitendinosus, and biceps femoris of 19 healthy college students. The participants performed standing bilateral squats and standing bilateral squats with 30’flexed hip joint with EMG measures taken upon initiation of muscle activity as confirmed by an electronic goniometer. Participants completed one trial with the EMG time measurements on each type.
Results: There was a significant difference between normal squats(standing squats) and normal squats with 30’ flexed hip joint. The normal squat exercise was statistically higer than normal squat exercise with 30’ flexed trunk except for semitendinosus and biceps femoris that shown slightly high.
Conclusions: As a result of this study, there were increases of muscle activity in both ways. In particular, it may be more beneficial for knee joint stabilization to perform normal squat exercise with standing position relatively.
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KEYWORD
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Electromyography, Hamstring, Quadriceps, Squat exercise
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