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http://dx.doi.org/10.13066/kspm.2019.14.2.9

Effect of Modified Clamshell Exercise on Gluteus Medius, Quadratus Lumborum and Anterior Hip Flexor in Participants with Gluteus Medius Weakness  

Jeong, Seom-Gyeul (Department of Physical Therapy, Graduate School, Yonsei University)
Cynn, Heon-Seock (Department of Physical Therapy, Graduate School, Yonsei University)
Lee, Ji-Hyun (Department of Physical Therapy, Graduate School, Yonsei University)
Choi, Silah (Department of Physical Therapy, Graduate School, Yonsei University)
Kim, Daeun (Department of Physical Therapy, Graduate School, Yonsei University)
Publication Information
Journal of the Korean Society of Physical Medicine / v.14, no.2, 2019 , pp. 9-19 More about this Journal
Abstract
PURPOSE: This study compared the effects of three different clamshell exercises (CLAM) on the gluteus medius (GMED), quadratus lumborum (QL), anterior hip flexor (AHF), gluteus medius/quadratus lumborum ratio, and gluteus medius/anterior hip flexor ratio by studying the activities of participants with GMED weakness. METHODS: Eleven subjects with weak GMED participated in this study. Subjects performed CLAM under three different conditions (standard, and modified 1 and 2). Surface electromyography was then used to measure the muscle activity and one-way repeated-measures analysis of variance was used to assess the statistical significance of the measured variables. RESULTS: GMED and the QL muscle activities did not differ significantly between the standard CLAM and the modified CLAM with the 2 different foot positions (F=4.74, P=.02; F=4.57, P=.02, respectively). AHF activity was significantly different in the two different foot positions when compared to the standard CLAM (F=11.17, P=.00). However, there was no significant difference between the AHF activities for the two different foot positions (P=.09). Finally, GMED/QL and GMED/AHF ratios were not significantly different between the three different CLAM exercises (F=.63, P=.55; F=.82, P=.45, respectively). CONCLUSION: Modified CLAM can be recommended as a good method to minimize AHF activity while maintaining GMED activity in subjects with weak GMED.
Keywords
Anterior hip flexor; Clamshell exercise; Electromyography;
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