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KMID : 0608320230300010008
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Physical Therapy Korea
2023 Volume.30 No. 1 p.8 ~ p.14
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Comparison of Hip Extensor Muscles Activities According to Forward Trunk Lean Angles During Single-leg Deadlift
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Lee Sae-Rin
An Duk-Hyun
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Abstract
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Background: Excessive hamstring (HS) activation due to the weakness of the gluteus maxi-mus (GM) causes pain in the hip joint. A single-leg deadlift is a hip extensor exercise, espe-cially GM, that includes functional movements in daily life and complex multi-joint training. In single-leg deadlift, the muscle activity depends on the forward trunk lean angle, and it's necessary to study which muscles are used dominantly depending on the angle.
Objects: The purpose of this study was to compare the effect on the muscle activity of the GM and HS during single-leg deadlift according to different forward trunk lean angles and the ratio of the GM vs HS (GM/HS).
Methods: Twenty-one healthy female participants were recruited. The muscles activities of the GM, HS and the GM/HS ratio were measured through electromyography during single-leg deadlift according to three condition of forward trunk lean angles (30°, 60°, and 90°).
Results: The GM and HS activities significantly differed among three conditions (p < 0.05). GM/HS ratio was significantly higher at 30°and 60° of forward trunk lean compared to 90°. Moreover, the GM activity was significantly higher at 60°of forward trunk lean than at 30° (p < 0.05).
Conclusion: The single-leg deadlift at 60°of forward trunk lean is a proper GM muscle strengthening exercise.
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KEYWORD
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Exercise, Glutues maximus, Hamstring muscles, Muscle strength
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