Saito Akira, Mizuno Takamasa
Center for Health and Sports Science, Kyushu Sangyo University, Fukuoka, Japan.
Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya, Japan.
Physiol Rep. 2025 Aug;13(16):e70538. doi: 10.14814/phy2.70538.
Stretching-induced impairments of muscle performance are attributed to neural adaptations and mechanical changes. Inhibition of muscle spindle sensitivity appears to have long-lasting effects after stretching. However, whether a dose-response relationship exists between stretching duration and muscle spindle sensitivity remains unclear. The present study aimed to reveal the effect of static stretching duration on modulation of muscle spindle sensitivity in the soleus muscle. The present study used data obtained from 19 young men. Static stretching intervention involved five 1-min stretches with 1-min intervals between stretches under maximal dorsiflexion. The Hoffmann-reflex (H-reflex) and tendon-reflex (T-reflex) were recorded from the soleus before and during stretching, at intervals between stretching. Time-course changes in H-reflex and T-reflex amplitudes from baseline (i.e., before stretching) were calculated. The H-reflex amplitude depressed 51.5%-55.2% during static stretching, and these H-reflex depressions recovered in the interval following each stretch. T-reflex amplitudes depressed 71.2%-73.5% during static stretching, and these T-reflex depressions remained following each interval. Inhibitions of the T-reflex amplitude after the second to fifth stretches were not significantly stronger than that after the first static stretch. These results suggest that 1-min static stretching under maximal dorsiflexion achieves sufficient modulation of muscle spindle sensitivity of the soleus.
拉伸引起的肌肉性能损伤归因于神经适应性和机械变化。拉伸后，肌肉纺锤体敏感性的抑制似乎具有持久影响。然而，拉伸持续时间与肌肉纺锤体敏感性之间是否存在剂量反应关系仍不清楚。本研究旨在揭示静态拉伸持续时间对比目鱼肌肌肉纺锤体敏感性调节的影响。本研究使用了从19名年轻男性获得的数据。静态拉伸干预包括在最大背屈状态下进行五次1分钟的拉伸，每次拉伸之间间隔1分钟。在拉伸前、拉伸期间以及拉伸间隔期间，记录比目鱼肌的霍夫曼反射（H反射）和腱反射（T反射）。计算H反射和T反射幅度相对于基线（即拉伸前）的时间进程变化变化。静态拉伸期间，H反射幅度降低了51.5%-55.2%，并且这些H反射降低在每次拉伸后的间隔中恢复。静态拉伸期间，T反射幅度降低了71.2%-73.5%，并且这些T反射降低在每个间隔后仍然存在。第二次至第五次拉伸后T反射幅度的抑制并不比第一次静态拉伸后明显更强。这些结果表明，在最大背屈状态下进行1分钟的静态拉伸能够充分调节比目鱼肌的肌肉纺锤体敏感性。
