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KMID : 1211620200150020001
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Journal of the Korean Society of Physical Medicine
2020 Volume.15 No. 2 p.1 ~ p.9
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Effects of Different External Loads on the Activities of the Gluteus Maximus and Biceps Femoris during Prone Hip Extension in Healthy Young Men
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Bae Chang-Hwan
Choe Yu-Won
Kim Myoung-Kwon
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Abstract
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Purpose: This study examined the effects of different external loads on the muscle activities around the hip during prone hip extension with knee flexion (PHEKF) exercise in healthy young men.
Methods: Sixteen healthy adult males participated in the study. A pressure biofeedback unit was used to provide feedback to the participants during the abdominal drawing-in maneuver (ADIM) with PHEKF. Sandbags (0kg, 1kg, 2kg, and 3kg) were used to provide external resistance. The quadriceps was contracted to maintain knee flexion 90° against resistance. Each resistance condition using a sandbag weight was given in random order. Surface electromyography (sEMG) was used to measure the electrical activity of the gluteus maximus, biceps femoris, and erector spinae during PHEKF.
Results: The muscle activity of the gluteus maximus was highest with the 3kg resistance and lowest with 0kg (F=128.46, P=.00). The muscle activities of the biceps femoris and erector spinae were highest with 0kg and lowest with 3kg (F = 29.49, P = .00). The muscle activity rate of the gluteus maximus/biceps femoris was highest with 3kg and lowest with 0kg (F = 37.49, P = .00).
Conclusion: The activity of the gluteus maximus was increased using a higher external weight load during PHEKF, while the activity of the biceps femoris decreased. These findings suggest that an external weight is needed during hip extensor exercise to strengthen the gluteus maximus and inhibit the biceps femoris.
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KEYWORD
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Electromyography, External loads, Gluteus maximus, Prone hip extension
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