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KMID : 1012020210100020090
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Physical Therapy Rehabilitation Science
2021 Volume.10 No. 2 p.90 ~ p.97
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Effects of pressure biofeedback application location for subjects with lumbar instability on pelvic rotation and hip joint abductor muscle activity during the Clam exercise
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Choi Yong-Gil
Lee Sang-Yeol
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Abstract
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Objective: The purpose of this study was to find out how the back instability during clam exercise (CE) causes changes in pelvic rotation and hip joint abductor muscle activity, and to find out the effects with different methods of application of pressure biofeedback.
Design: Comparative study using repeated measures.
Methods: Each subjects performed the clam exercise (CE) without pressure biofeedback, the clam exercise with pressure biofeedback applied to the back (CE-PBU to back), and the clam exercise with pressure biofeedback applied to the side (CE-PBU to side). The amount of pelvic rotation was measured using myomotion. And the muscle activity of the muscle gluteus medius and the tensor fasciae latae was measured using EMG device. One-way repeated measures ANOVA followed by the Bonferroni post test were used to compare the EMG activity in each muscle and pelvic rotation angle during the CE, CE-PBU to back, CE-PBU to side.
Results: The amounts of pelvic rotation was the lowest in CE-PBU to back (p<0.05) and the ratio of muscle activity of the muscle gluteus / tensor fasciae latae was the highest in CE-PBU to back (p<0.05).
Conclusions: It is thought that, in order to stabilize the waist-pelvis and increase hip joint muscle strength in subjects with back instability, applying clam exercise with pressure biofeedback applied to the lower back is effective in improving waist-pelvic movements and selectively strengthening the muscle gluteus medius.
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KEYWORD
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Clam exercise, Lumbar instability, Lumbo-pelvic movement, Pelvic rotation
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