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KMID : 1142420210190010001
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PNF and Movement
2021 Volume.19 No. 1 p.1 ~ p.8
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The Effects of Tibial Rotation on Muscle Activity and Force of Hamstring Muscle During Isometric Knee Flexion in Healthy Women
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Ko Min-Joo
Kang Min-Hyeok
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Abstract
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Purpose: The purpose of this study was to determine how the position of tibial rotation affects peak force and hamstring muscle activation during isometric knee flexion in healthy women.
Methods: Seventeen healthy women performed maximum isometric knee flexion at 30° with three tibial rotation positions (tibial internal rotation, neutral position, and tibial external rotation). Surface electromyographic (EMG) activity was recorded from the medial hamstring (MH) and lateral hamstring (LH) muscles. The strength of the knee flexor was measured with a load-cell-type strength-measurement sensor. Data were analyzed using one-way repeated analysis of variance.
Results: The results showed that MH and LH activities and peak force were significantly different among the three tibial rotation conditions (p < 0.01). The post-hoc comparison revealed that the MH EMG activity in tibial neutral and internal rotation positions were significantly greater than tibial external rotation (p < 0.01). The LH activity in tibial external rotation was significantly greater than the tibial neutral position and internal rotation (p < 0.01). The peak force of the knee flexor was also greater in the external tibial rotation position compared with the tibial neutral and internal rotation positions (p < 0.01).
Conclusion: Our findings suggest that hamstring muscle activation could be changed by tibial rotation.
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KEYWORD
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Hamstring, Female, Tibial rotation, Electromyography
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