人体肌肉和肌腱结构的僵硬度与体内肌纤维组成有关吗？
Is the stiffness of human muscle and tendon structures related to muscle fiber composition in vivo?
作者信息
Kubo Keitaro, Miyazaki Daisuke, Yata Hideaki, Shimoju Shozo, Okada Masaji, Tsunoda Naoya
机构信息
Department of Life Science, The University of Tokyo, Meguro, Tokyo, Japan -
Faculty of Physical Education, Kokushikan University, Tokyo, Japan.
出版信息
J Sports Med Phys Fitness. 2018 May;58(5):622-629. doi: 10.23736/S0022-4707.17.06890-6. Epub 2017 Apr 26.
BACKGROUND
The aim of the present study was to investigate the relationship between estimated muscle fiber composition (time-to-peak twitch torque; TPT) and muscle stiffness under passive and active conditions as well as stiffness of tendon structures in human plantar flexors.
METHODS
TPT was assessed using supramaximal electrical stimulation. Active muscle stiffness in the medial gastrocnemius muscle was calculated based on changes in estimated muscle force and fascicle length during fast stretching after 50% maximal isometric contractions. Passive muscle stiffness was also calculated from estimated passive muscle force and fascicle length during slow passive stretching. Stiffness of tendon structures was determined during isometric plantar flexion using ultrasonography.
RESULTS
TPT did not correlate with passive muscle stiffness (r=0.039, P=0.790), active muscle stiffness (r=0.185, P=0.203), or stiffness of tendon structures (r=-0.178, P=0.477).
CONCLUSIONS
These results suggested that the muscle fiber composition of the human medial gastrocnemius muscle was not related to the mechanical properties of muscles or tendon structures.
背景
本研究旨在探讨估计的肌纤维组成（峰值抽搐扭矩时间；TPT）与人类跖屈肌在被动和主动条件下的肌肉僵硬度以及肌腱结构僵硬度之间的关系。
方法
使用超强电刺激评估TPT。在50%最大等长收缩后快速拉伸期间，根据估计的肌肉力量和肌束长度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期间估计的被动肌肉力量和肌束长度计算得出。使用超声检查在等长跖屈期间测定肌腱结构的僵硬度。
结果
TPT与被动肌肉僵硬度（r = 0.039，P = 0.790）、主动肌肉僵硬度（r = 0.185，P = 0.203）或肌腱结构僵硬度（r = -0.178，P = 0.477）均无相关性。
结论
这些结果表明，人类腓肠肌内侧的肌纤维组成与肌肉或肌腱结构的力学特性无关。
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