Nakaizumi Dai, Asai Hitoshi, Inaoka Pleiades Tiharu, Ohno Naoki, Miyati Tosiaki
Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University: 5-11-80 Kodatsuno, Kanazawa, Ishikawa 920-0942, Japan.
Department of Rehabilitation, Kanazawa Red Cross Hospital, Japan.
J Phys Ther Sci. 2019 Mar;31(3):267-272. doi: 10.1589/jpts.31.267. Epub 2019 Mar 19.
[Purpose] We aimed to investigate the change rate in the cross-sectional area of each hamstring component to evaluate muscle extensibility and to contribute to the studies on hamstring strain prevention. [Participants and Methods] Fifteen healthy young males volunteered to participate in this study. They performed a knee extension test. For the measurements, we used multi-posture magnetic resonance imaging (gravity magnetic resonance imaging), the open shape of which allows performing body scanning in various positions. We measured the maximum cross-sectional area of the hamstring during the initial and stretch positions from the obtained images. Then, for each muscle, we calculated the maximum cross-sectional area change rate relative to the initial position. [Results] For all hamstring muscles, the maximum cross-sectional area during stretching was significantly smaller than that in the initial position. The maximum cross-sectional area change rate of the semimembranosus was significantly smaller than that of the other 3 muscles (there were no significant differences among these 3 muscles). [Conclusion] The results suggest that the semimembranosus has higher resistance to morphological change than the other muscles, which could be an important limiting factor for the extensibility of the hamstring muscle group.
[目的] 我们旨在研究每根腘绳肌组成部分横截面积的变化率，以评估肌肉的伸展性，并为腘绳肌拉伤预防研究提供帮助。[参与者与方法] 15名健康年轻男性自愿参与本研究。他们进行了膝关节伸展测试。在测量过程中，我们使用了多体位磁共振成像（重力磁共振成像），其开放的形状允许在不同位置进行身体扫描。我们从获得的图像中测量了腘绳肌在初始位置和伸展位置时的最大横截面积。然后，对于每块肌肉，我们计算了相对于初始位置的最大横截面积变化率。[结果] 对于所有腘绳肌，伸展时的最大横截面积显著小于初始位置时的最大横截面积。半膜肌的最大横截面积变化率显著小于其他3块肌肉（这3块肌肉之间无显著差异）。[结论] 结果表明，半膜肌比其他肌肉具有更高的形态变化抵抗力，这可能是腘绳肌群伸展性的一个重要限制因素。
