Department of Physical Therapy, Gumi University, Gumi, Republic of Korea.
Department of Physical Therapy, College of Health and Welfare, Woosong University, Daejeon, Republic of Korea; Woosong Institute of Rehabilitation Science, Daejeon, Republic of Korea.
J Bodyw Mov Ther. 2023 Apr;34:1-5. doi: 10.1016/j.jbmt.2023.04.029. Epub 2023 Apr 12.
Limited studies have compared the muscle activity of the medial and lateral hamstrings as knee flexors with tibial internal and external rotation and hip extensors with hip internal and external rotation. In particular, hamstring activity during hip extension with hip rotation has rarely been investigated.
This study aimed to compare the muscle activity of the medial and lateral hamstrings as knee flexors and hip extensors and to compare the activity of these muscles according to tibial rotation during isometric knee flexion and hip rotation during isometric hip extension.
A total of 23 healthy adults participated in the study. The electromyographic (EMG) activity of the hamstrings was measured during maximal isometric knee flexion and maximal isometric hip extension. In addition, tibial rotation was applied actively during maximal isometric knee flexion, whereas hip rotation was applied actively during maximal isometric hip extension.
EMG activity during maximal isometric knee flexion with tibial internal and external rotation was significantly higher than that during maximal isometric hip extension with hip internal and external rotation, respectively. For EMG activity according to tibial and hip rotation, there was no significant difference between tibial internal and external rotation during maximal isometric knee flexion, whereas there was a significant difference between hip internal and external rotation during maximal isometric hip extension.
Hamstring activity was higher for knee flexors than for hip extensors. However, hip rotation during maximal isometric hip extension is an effective intervention for selective muscle activation of the medial and lateral hamstrings.
有限的研究比较了作为膝关节屈肌的腘绳肌的内侧和外侧肌与胫骨内旋和外旋以及髋关节伸肌与髋关节内旋和外旋的肌肉活动。特别是，髋关节伸展时髋关节旋转的腘绳肌活动很少被研究过。
本研究旨在比较作为膝关节屈肌和髋关节伸肌的腘绳肌的肌肉活动，并比较这些肌肉在等长膝关节屈曲时胫骨旋转和等长髋关节伸展时髋关节旋转时的活动。
共有 23 名健康成年人参与了这项研究。在最大等长膝关节屈曲和最大等长髋关节伸展时测量了腘绳肌的肌电图（EMG）活动。此外，在最大等长膝关节屈曲时主动施加胫骨旋转，而在最大等长髋关节伸展时主动施加髋关节旋转。
最大等长膝关节屈曲时胫骨内旋和外旋的 EMG 活动明显高于最大等长髋关节伸展时髋关节内旋和外旋的 EMG 活动。对于根据胫骨和髋关节旋转的 EMG 活动，最大等长膝关节屈曲时胫骨内旋和外旋之间没有显著差异，而最大等长髋关节伸展时髋关节内旋和外旋之间有显著差异。
作为膝关节屈肌的腘绳肌的活动高于作为髋关节伸肌的腘绳肌的活动。然而，最大等长髋关节伸展时髋关节旋转是选择性激活内侧和外侧腘绳肌的有效干预措施。
