Muscle coordination of mediolateral balance in normal walking
Muscle coordination of mediolateral balance in normal walking
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DOI：
10.1016/j.jbiomech.2010.04.010
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发表时间：
2010-08-10
影响因子：
2.4
通讯作者：
Kim, Hyung Joo
中科院分区：
文献类型：
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作者：
Pandy, Marcus G.;Lin, Yi-Chung;Kim, Hyung Joo
本研究的目的是描述和解释正常行走过程中个体肌肉如何控制内侧平衡。生物力学模型和实验步态数据用于量化站立阶段个体肌肉对质心内侧加速度的贡献。我们测试了这样的假设：髋关节、膝关节和踝关节伸肌主要作用于矢状面，对垂直支撑和向前推进有显着贡献，也加速了中外侧方向的质心。同时记录五名以自己喜欢的速度行走的健康受试者的运动学、测力台和肌肉肌电图数据。身体被建模为一个 10 段、23 个自由度的骨骼，由 54 块肌肉驱动。通过解决最小化肌肉激活平方和的优化问题，从逆动力学获得的关节力矩被分解为肌肉力。在整个站立过程中，肌肉对质心的中间外侧加速有显着贡献。产生支撑和向前推进的肌肉（股底肌、比目鱼肌和腓肠肌）也与髋内收肌和跖屈外翻肌协同作用，横向加速重心。在站立阶段的大部分时间里，重力都会横向加速质心。髋关节外展肌、臀中肌前部和臀后部，以及在较小程度上的跖屈肌内翻肌，通过加速内侧质心来主动控制平衡。 (C) 2010 Elsevier Ltd. 保留所有权利。
The aim of this study was to describe and explain how individual muscles control mediolateral balance during normal walking. Biomechanical modeling and experimental gait data were used to quantify individual muscle contributions to the mediolateral acceleration of the center of mass during the stance phase. We tested the hypothesis that the hip, knee, and ankle extensors, which act primarily in the sagittal plane and contribute significantly to vertical support and forward progression, also accelerate the center of mass in the mediolateral direction. Kinematic, force plate, and muscle EMG data were recorded simultaneously for five healthy subjects who walked at their preferred speeds. The body was modeled as a 10-segment, 23 degree-of-freedom skeleton, actuated by 54 muscles. Joint moments obtained from inverse dynamics were decomposed into muscle forces by solving an optimization problem that minimized the sum of the squares of the muscle activations. Muscles contributed significantly to the mediolateral acceleration of the center of mass throughout stance. Muscles that generated both support and forward progression (vasti, soleus, and gastrocnemius) also accelerated the center of mass laterally, in concert with the hip adductors and the plantarflexor everters. Gravity accelerated the center of mass laterally for most of the stance phase. The hip abductors, anterior and posterior gluteus medius, and, to a much lesser extent, the plantarflexor inverters, actively controlled balance by accelerating the center of mass medially. (C) 2010 Elsevier Ltd. All rights reserved.