Hip Muscle Activity during Isometric Contraction of Hip
Abduction |
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Authors: | Hiroyuki Fujisawa Hiroto Suzuki Emi Yamaguchi Hiromi Yoshiki Yui Wada Aya Watanabe |
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Institution: | 1) Department of Rehabilitation, Faculty of Medical Science and Welfare, Tohoku Bunka Gakuen University, Japan |
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Abstract: | Purpose] This study aimed to determine the effect of varying hip flexion angle on hip
muscle activity during isometric contraction in abduction. Subjects] Twenty-seven healthy
men (mean age=21.5 years, SD=1.2) participated in this study. Methods] Surface
electromyography (EMG) was recorded of the upper portion of the gluteus maximus (UGM),
lower portion of the gluteus maximus (LGM), tensor fasciae latae (TFL), and gluteus medius
(GMed) during isometric contraction under two measurement conditions: hip flexion angle
(0, 20, 40, 60, and 80 degrees) and abduction of the hip joint at 20, 40, 60, and 80%
maximum strength. Integrated EMG (IEMG) were calculated and normalized to the value of
maximum voluntary contraction (MVC). Results] Results indicated that the IEMG of both the
UGM and LGM increased significantly with increases in hip flexion angle, whereas the IEMG
of the TFL decreased significantly. The maximum activities of the UGM and the LGM were
85.7 ± 80.8%MVC and 38.2 ± 32.9%MVC at 80 degrees of hip flexion, respectively, and that
of the TFL was 71.0 ± 39.0%MVC at 40 degrees of hip flexion. Conclusion] The IEMG of the
GMed did not change with increases in hip flexion angle. Hip flexion angle affected the
activity of the GM and TFL during isometric contraction in abduction.Key words: Hip abductor, Electromyography, Muscle activity |
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