The effects of dynamic stretching on the passive properties of the muscle-tendon unit
The effects of dynamic stretching on the passive properties of the muscle-tendon unit
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DOI：
10.1080/02640414.2012.736632
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发表时间：
2013-03-01
影响因子：
3.4
通讯作者：
Cramer, Joel T.
中科院分区：
文献类型：
--
作者：
Herda, Trent J.;Herda, Nathan D.;Cramer, Joel T.
本研究的目的是检查动态拉伸对膝关节屈肌被动生物力学特性和等距肌肉力量的影响。14名健康男性（平均+/- 5岁：年龄=24 +/- 3岁）在动态拉伸前后分别在膝关节完全伸展35度、50度、65度、80度和95度处进行被动活动范围评估和膝关节屈肌的等距最大自主收缩。此外，在最大自主收缩时记录股二头肌肌电振幅。在动态拉伸前后分别测量被动刚度和被动电阻扭矩。动态拉伸包括参与者将他们的右腿向外伸展到末端范围运动，并将他们的腿向后拉向身体，同时坐在等速测力机中进行四次30秒的比赛，比赛之间休息20秒。动态拉伸后被动运动范围增大，被动刚度和被动电阻转矩减小。在膝关节角度为65度和完全伸展后80度时，峰值扭矩下降，而动态拉伸后肌电图振幅下降。动态拉伸导致被动刚度和被动电阻扭矩的变化，这是静态拉伸后的典型报道，然而，在两个膝关节角度处的峰值扭矩有所下降。
The purpose of this study was to examine the effects of dynamic stretching on the passive biomechanical properties and isometric muscle strength of the knee flexors. Fourteen healthy men (mean +/- s: age=24 +/- 3 years) performed passive range of motion assessments and isometric maximal voluntary contractions of the knee flexors at knee joint angles of 35 degrees, 50 degrees, 65 degrees, 80 degrees, and 95 degrees below full knee extension before and after dynamic stretching. In addition, electromyographic amplitude was recorded from the biceps femoris during the maximal voluntary contractions. Passive stiffness and passive resistive torque were measured during pre- and post-dynamic stretching. The dynamic stretching included the participant extending their right leg outwards to the end range motion and pulling their leg back towards the body while seated in the isokinetic dynamometer for four 30-s bouts with 20-s rest between bouts. Passive range of motion increased while passive stiffness and passive resistive torque decreased following dynamic stretching. Peak torque decreased at knee joint angles of 65 degrees and 80 degrees below full extension, while electromyographic amplitude decreased following dynamic stretching. Dynamic stretching resulted in changes to passive stiffness and passive resistive torque that are typically reported following static stretching, however, there were decreases in peak torque at two of the knee joint angles.