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KMID : 1101520210250030051
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Journal of Korean Society for Neurotherapy
2021 Volume.25 No. 3 p.51 ~ p.58
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Effect of Lower Extremity Alignment during Gluteus Medius Strengthening Exercise on Hip Abductor Muscle Activity and Muscle Recruitment Pattern
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Shin Seung-Hwan
Shin Ho-Jin
Cho Hwi-Young
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Abstract
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Purpose: The purpose of this study was to investigate the effects of alignment of the lower extremity during hip abduction exercise and clamshell exercise.
Methods: The subjects were twenty healthy men without low back pain or lower limb pain. Subjects performed four gluteus medius exercises: hip abduction (AB), hip abduction with the alignment of the lower extremity (AB-AL), clamshell (CLAM), clamshell with the alignment of lower extremity (CLAM-AL). Surface EMG was used to measure hip abductor muscle activity and recruitment pattern from the five muscles: gluteus medius (Gmed), tensor fascia latae (TFL), gluteus maximus upper fiber (GmaxU), gluteus maximus lower fiber (GmaxL), and quadratus lumborum (QL).
Results: TFL EMG activity was significantly greater in AB than in ABAL (p>.05). Gmed was significantly greater in CLAM than in CLAM-AL. Gmed, TFL, QL were significantly greater AB than CL. GmaxU, GmaxL were significantly greater CLAM than AB (p>.05). In the recruitment pattern, there was a difference between AB and CLAM (p<.05). However, In both exercises, there was no difference according to lower extremity alignment (p<.05).
Conclusion: It is recommended to perform the exercise in consideration of the type of exercise and the alignment of the lower extremity according to the aim of training.
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KEYWORD
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Hip abduction, Clamshell, Gluteus medius, Muscle activity, Lower extremity alignment
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