Mizuno Takamasa, Matsumoto Minoru, Umemura Yoshihisa
Laboratory for Exercise Physiology and Biomechanics, School of Health and Sport Sciences, Chukyo University, Toyota, Japan.
J Strength Cond Res. 2014 Jan;28(1):147-53. doi: 10.1519/JSC.0b013e3182964220.
The purpose of this study was to clarify the time course of the stretching-induced decrease in maximal isometric plantar flexion torque. Nineteen women participated in 2 randomly ordered experimental trials: static 5-minute stretching or control with no stretching. The participants performed isometric maximal voluntary contractions (MVCs) of the right plantar flexor muscles, whereas electromyographic (EMG) amplitude (root mean square) was calculated for the medial and lateral gastrocnemius muscles. Measurements were conducted preintervention; immediately after intervention; and 5, 10, 15, and 30 minutes postintervention. The static 5-minute stretching trial consisted of dorsiflexion to the end range of motion and holding that position for 1 minute, 5 times, whereas the control trial consisted of 5 minutes of resting. As a result, the MVC torque was significantly decreased immediately after, and 5 minutes after the static 5-minute stretching intervention compared with the preintervention value (p < 0.05), and this change recovered within 10 minutes. However, the EMG amplitude did not change from preintervention to postintervention under any conditions. These results suggest that the deficits of static stretching are disabled in a short time after static stretching.
本研究的目的是阐明拉伸诱导的最大等长跖屈扭矩下降的时间进程。19名女性参与了2项随机排序的实验试验：5分钟静态拉伸或无拉伸的对照试验。参与者进行右侧跖屈肌的等长最大自主收缩（MVC），同时计算腓肠肌内侧和外侧的肌电图（EMG）幅度（均方根）。在干预前、干预后立即以及干预后5、10、15和30分钟进行测量。5分钟静态拉伸试验包括背屈至运动终末范围并保持该位置1分钟，重复5次，而对照试验包括5分钟的休息。结果，与干预前的值相比，在静态5分钟拉伸干预后立即以及干预后5分钟，MVC扭矩显著降低（p < 0.05），并且这种变化在10分钟内恢复。然而，在任何条件下，EMG幅度从干预前到干预后均未发生变化。这些结果表明，静态拉伸后的不足在短时间内即可消除。
