Kubo Keitaro, Miyazaki Daisuke, Yamada Kenji, Yata Hideaki, Shimoju Shozo, Tsunoda Naoya
Department of Life Science, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan.
Faculty of Physical Education, Kokushikan University, Tokyo, Japan.
J Biomech. 2015 Jul 16;48(10):1937-43. doi: 10.1016/j.jbiomech.2015.04.012. Epub 2015 Apr 17.
The aim of the present study was to compare passive and active muscle stiffness and tendon stiffness between long distance runners and untrained men. Twenty long distance runners and 24 untrained men participated in this study. Active muscle stiffness in the medial gastrocnemius muscle was calculated according to changes in estimated muscle force and fascicle length during fast stretching after submaximal isometric contractions. Passive muscle stiffness was also calculated from estimated passive muscle force and fascicle length during slow passive stretching. Tendon stiffness was determined during isometric plantar flexion by ultrasonography. Passive muscle stiffness of long distance runners was significantly higher than that of untrained men (p<0.001). Active muscle stiffness at all torque levels of long distance runners was also significantly higher than that of untrained men (p<0.001). No significant difference was observed in tendon stiffness between long distance runners and untrained men (p=0.869). These results suggested that passive and active muscle stiffness were higher in long distance runners than in untrained men, whereas no significant difference was observed in tendon stiffness between the two groups.
本研究的目的是比较长跑运动员和未经训练的男性之间的被动和主动肌肉僵硬度以及肌腱僵硬度。20名长跑运动员和24名未经训练的男性参与了本研究。在次最大等长收缩后的快速拉伸过程中，根据估计的肌肉力量和肌束长度的变化计算腓肠肌内侧的主动肌肉僵硬度。被动肌肉僵硬度也根据缓慢被动拉伸过程中估计的被动肌肉力量和肌束长度来计算。通过超声检查在等长跖屈过程中测定肌腱僵硬度。长跑运动员的被动肌肉僵硬度显著高于未经训练的男性（p<0.001）。长跑运动员在所有扭矩水平下的主动肌肉僵硬度也显著高于未经训练的男性（p<0.001）。长跑运动员和未经训练的男性之间的肌腱僵硬度未观察到显著差异（p=0.869）。这些结果表明，长跑运动员的被动和主动肌肉僵硬度高于未经训练的男性，而两组之间的肌腱僵硬度未观察到显著差异。
