Individual muscle contributions to support in normal walking
Individual muscle contributions to support in normal walking
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DOI：
10.1016/s0966-6362(02)00073-5
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发表时间：
2003-04-01
期刊：
影响因子：
2.4
通讯作者：
Pandy, MG
中科院分区：
文献类型：
--
作者：
Anderson, FC;Pandy, MG
本研究的目的是量化的贡献，个别肌肉支持整个身体在正常步态。肌肉对支撑的贡献通过其对地面施加的垂直力的时间历程的贡献来描述。该分析是基于一个三维的，肌肉驱动的身体模型和正常行走的动态优化解决方案。结果表明，在站立早期，脚平放在地面之前，主要由踝关节背屈肌提供支撑。在平足后，但在对侧脚趾离地前，主要由臀大肌、股大肌和臀后中/小肌产生支撑;这些肌肉负责垂直地面反作用力中的第一个峰值。站立中期的大部分支撑是由臀中肌/臀小肌提供的，重力也有很大的帮助。踝跖屈肌在站立后期几乎产生了所有的支撑力，这些肌肉负责垂直地面反作用力的第二个峰值。结果还表明，离心力的作用，以减少垂直地面反作用力，但只有少量，和阻力的骨骼重力不大于1/2体重在整个步态周期。(C)2002 Elsevier Science B. V.保留所有权利。
The purpose of this study was to quantify the contributions made by individual muscles to support of the whole body during normal gait. A muscle's contribution to support was described by its contribution to the time history of the vertical force exerted by the ground. The analysis was based on a three-dimensional, muscle-actuated model of the body and a dynamic optimization solution for normal walking. The results showed that, in early stance, before the foot was placed flat on the ground, support was provided mainly by the ankle dorsiflexors. After foot-flat, but before contralateral toe-off support was generated primarily by gluteus maximus, vasti, and posterior gluteus medius/minimus; these muscles were responsible for the first peak seen in the vertical ground-reaction force. The majority of support in midstance was provided by gluteus medius/minimus, with gravity assisting significantly as well. The ankle plantarflexors generated nearly all support in late stance; these muscles were responsible for the second peak in the vertical ground-reaction force. The results showed also that centrifugal forces act to decrease the vertical ground-reaction force, but only by minor amounts, and that resistance of the skeleton to the force of gravity is no larger than 1/2 body weight throughout the gait cycle. (C) 2002 Elsevier Science B.V. All rights reserved.