Changes in joint range of motion and muscle-tendon unit stiffness after varying amounts of dynamic stretching
Changes in joint range of motion and muscle-tendon unit stiffness after varying amounts of dynamic stretching
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DOI：
10.1080/02640414.2016.1260149
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发表时间：
2017-01-01
影响因子：
3.4
通讯作者：
Mizuno, Takamasa
中科院分区：
文献类型：
--
作者：
Mizuno, Takamasa
本研究的目的是研究动态拉伸（DS）对关节活动度（ROM）和肌肉-肌腱单位（MTU）刚度的影响。15名健康受试者参加了4项随机排序的实验性试验，其中包括1组（DS 1）、4组（DS 4）和7组（DS 7）DS，或对照条件/静息坐姿（CON）。每个DS组包括15次重复的踝关节背屈-跖屈运动。当踝关节被动背屈至最大背屈角为0.0174 rad.s（-1）时，用超声测量肌肉-肌腱连接（MTJ）的位移。还使用等速测力计测量被动扭矩。与干预前相比，DS 4和DS 7后踝关节ROM显著增加（P < 0.05），但DS 4和DS 7之间的踝关节ROM无显著差异。DS 1和CON后踝关节ROM无差异。此外，在任何实验条件下，次最大背屈角度下的MTU刚度、被动扭矩和MTJ位移均未发生变化。这些结果表明，DS 4增加了踝关节ROM，而没有改变MTU的机械性能，并且这种踝关节ROM的增加在DS 4之后达到稳定。
The purpose of this study was to examine the effects of varying amounts of dynamic stretching (DS) on joint range of motion (ROM) and stiffness of the muscle-tendon unit (MTU). Fifteen healthy participants participated in four randomly ordered experimental trials, which involved one (DS1), four (DS4) and seven (DS7) sets of DS, or control conditions/seated at rest (CON). Each DS set consisted of 15 repetitions of an ankle dorsiflexion-plantarflexion movement. The displacement of the muscle-tendon junction (MTJ) was measured using ultrasonography while the ankle was passively dorsiflexed at 0.0174 rad.s(-1) to its maximal dorsiflexion angle. Passive torque was also measured using an isokinetic dynamometer. Ankle ROM was significantly increased after DS4 and DS7 compared with the pre-intervention values (P < 0.05), but there were no significant differences in ankle ROM between DS4 and DS7. No differences were observed in ankle ROM after DS1 and CON. In addition, the stiffness of the MTU, passive torque and displacement of the MTJ at submaximal dorsiflexion angles did not change in any of the experimental conditions. These results indicate that DS4 increased ankle ROM without changing the mechanical properties of the MTU, and that this increase in ankle ROM plateaued after DS4.