The effects of dynamic stretching on plantar flexor muscle-tendon tissue properties
The effects of dynamic stretching on plantar flexor muscle-tendon tissue properties
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DOI：
10.1016/j.math.2011.07.003
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发表时间：
2011-12-01
期刊：
影响因子：
--
通讯作者：
Takeda, Naoki
中科院分区：
文献类型：
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作者：
Samukawa, Mina;Hattori, Masaki;Takeda, Naoki
动态拉伸通常用于体育活动的热身程序。尽管已经报道了动态拉伸对运动表现的一些积极影响，但对肌肉肌腱单位（MTU）本身的影响仍然不清楚。本研究的目的是通过超声检查来确定动态拉伸对踝跖屈肌腱特性的影响。20名健康男性受试者参加了本研究。要求受试者进行跖屈肌的动态拉伸30 s，重复5组。动态拉伸前后测量踝关节背屈活动度。通过超声检查，还测定了肌腱接头（MTJ）位移、羽状角和肌束长度的变化。踝关节背屈活动度在动态拉伸后显著增加（p < 0.0001）。观察到MTJ的显著远侧位移，直到第二拉伸变形（p < 0.001），此后没有显著变化。羽饰角和束长不受动态拉伸的影响。动态拉伸被证明是有效的，在增加踝关节的灵活性。可能表明肌肉组织变化的结果（如羽状角和肌束长度）没有改变。然而，发现了一个显着的位移的MTJ，表明在肌腱组织的一些变化。因此，跖屈肌的动态拉伸被认为是延长肌腱组织的有效手段。(C)2011爱思唯尔有限公司保留所有权利。
Dynamic stretching is commonly used in warm-up routines for athletic activities. Even though several positive effects of dynamic stretching on athletic performance have been reported, the effects on the muscleetendon unit (MTU) itself are still unclear. The objective of this study is to determine the effects of dynamic stretching on the ankle plantar flexor muscleetendon properties by use of ultrasonography. Twenty healthy male subjects participated in the present study. The subjects were asked to engage in dynamic stretching of plantar flexors for 30 s and to repeat for 5 sets. Ankle dorsiflexion ROM was measured before and after the dynamic stretching. Changes in the displacement of the myotendinous junction (MTJ), pennation angle, and fascicle length were also determined by using ultrasonography. Ankle dorsiflexion ROM increased significantly after the dynamic stretching (p < 0.0001). A significant distal displacement of the MTJ was observed until the second stretching set (p < 0.001) with no significant changes thereafter. Pennation angle, and fascicle length were unaffected by the dynamic stretching. Dynamic stretching was shown to be effective in increasing ankle joint flexibility. Outcomes that could have indicated changes in muscle tissue (such as the pennation angle and fascicle length) were unaltered. However, a significant displacement of the MTJ was found, indicating some change in the tendon tissues. Therefore, dynamic stretching of the plantar flexors was considered an effective means of lengthening the tendon tissues. (C) 2011 Elsevier Ltd. All rights reserved.