Effect of the Different Hip Joint Angle Definition on the Estimation of Muscle-Tendon Complex Length of the Hip Extensor Muscles in Counter Movement Jump

Kiyonobu Kigoshi, K. Byun, M. Ogata, Akihiro Kato
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引用次数: 2

Abstract

The purpose of this study was to consider the discrepancy between the trunk-based and the pelvis-based hip joint angles, and the difference between the MTC lengths estimated on the basis of the two types of hip joint angles during dynamic movement. Ten male athletes performed CMJ. Joint kinematics and the MTC length of long head of biceps femoris were compared between the trunk-based hip angle and the pelvis-based hip angle. In the CMJ, the angular displacements of the trunk-based were significantly higher than that of pelvis-based hip joints. There were no significant correlations between the two types of hip joint angles except at initial position. As for long head of biceps femoris, in contrast with the trunk-based-hip joint angle derived MTC length, which shows stretching in the descending phase and shortening in the ascending phase, the pelvis-based hip joint angle derived MTC length shows little changes. These results suggest that the trunk-based and pelvis-based hip joint angles have similar patterns of fluctuation; however, the angular displacement of each type is not equivalent. These results also suggest that we may misinterpret the type of muscle contraction because the definitions of hip joint angle are different even for the same muscle type.
不同髋关节角度定义对反动作跳跃中髋伸肌肌-腱复合体长度估计的影响
本研究的目的是考虑基于躯干和基于骨盆的髋关节角度之间的差异,以及基于两种髋关节角度在动态运动中估计的MTC长度之间的差异。10名男运动员执行CMJ。比较了躯干为基础的髋关节角和骨盆为基础的髋关节角的关节运动学和股骨二头肌长头的MTC长度。在CMJ中,以躯干为基础的髋关节的角位移明显高于以骨盆为基础的髋关节。除初始位置外,两种类型髋关节角度之间无显著相关性。对于股二头肌长头,与以躯干为基础的髋关节角度衍生出的MTC长度呈下降期拉伸、上升期缩短的趋势相反,以骨盆为基础的髋关节角度衍生出的MTC长度变化不大。这些结果表明基于躯干和基于骨盆的髋关节角度有相似的波动模式;然而,每种类型的角位移是不相等的。这些结果还表明,我们可能会误解肌肉收缩的类型,因为即使对同一种肌肉类型,髋关节角度的定义也不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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