Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan; Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan.
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan.
J Bodyw Mov Ther. 2021 Oct;28:535-539. doi: 10.1016/j.jbmt.2021.09.012. Epub 2021 Sep 25.
The association between decreased muscle strength of rate of force development (RFD) immediately after static stretching (SS) and change in muscle stiffness or muscle slack has remained unclear.
This study aimed to investigate the association between changes in muscle strength and RFD and muscle stiffness or muscle slack immediately after SS.
Sixteen healthy male non-athlete volunteers participated in this study. The maximal voluntary contraction torque and shear elastic modulus of medial gastrocnemius muscle were measured before and after 300 s of SS intervention.
The results showed that maximal voluntary contraction torque and RFD at 100, 150, and 200 ms decreased significantly after the 300-s SS (p < 0.01). Additionally, shear elastic modulus at 0° (decrease in muscle stiffness) and slack angle decreased (increase in slack length) significantly after the 300-second SS (p < 0.01). However, no significant association was observed between changes in muscle strength and changes in mechanical properties of the MG.
These results suggested that the decrease in muscle strength and RFD could not be associated with changes in the passive mechanical properties of the medial gastrocnemius muscle.
在进行静态拉伸（SS）后，肌肉力量和力量发展速率（RFD）的下降与肌肉硬度或肌肉松弛度的变化之间的关联仍不清楚。
本研究旨在探讨 SS 后即刻肌肉力量和 RFD 的变化与肌肉硬度或肌肉松弛度之间的关系。
16 名健康的男性非运动员志愿者参与了本研究。在进行 300 秒 SS 干预前后，测量了内侧腓肠肌的最大自主收缩扭矩和剪切弹性模量。
结果显示，在进行 300 秒 SS 后，最大自主收缩扭矩和 100、150 和 200 毫秒时的 RFD 显著下降（p<0.01）。此外，在进行 300 秒 SS 后，0°时的剪切弹性模量（肌肉硬度降低）和松弛角度减小（松弛长度增加）显著（p<0.01）。然而，肌肉力量的变化与 MG 的力学特性的变化之间没有观察到显著的相关性。
这些结果表明，肌肉力量和 RFD 的下降可能与内侧腓肠肌的被动力学特性的变化无关。
