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首页> 外文期刊>Journal of Biomechanics >Feasible muscle activation ranges based on inverse dynamics analyses of human walking
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Feasible muscle activation ranges based on inverse dynamics analyses of human walking

机译：基于人体行走的逆动力学分析，可行的肌肉激活范围

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Although it is possible to produce the same movement using an infinite number of different muscle activation patterns owing to musculoskeletal redundancy, the degree to which observed variations in muscle activity can deviate from optimal solutions computed from biomechanical models is not known. Here, we examined the range of biomechanically permitted activation levels in individual muscles during human walking using a detailed musculoskeletal model and experimentally-measured kinetics and kinematics. Feasible muscle activation ranges define the minimum and maximum possible level of each muscle's activation that satisfy inverse dynamics joint torques assuming that all other muscles can vary their activation as needed. During walking, 73% of the muscles had feasible muscle activation ranges that were greater than 95% of the total muscle activation range over more than 95% of the gait cycle, indicating that, individually, most muscles could be fully active or fully inactive while still satisfying inverse dynamics joint torques. Moreover, the shapes of the feasible muscle activation ranges did not resemble previously-reported muscle activation patterns nor optimal solutions, i.e. static optimization and computed muscle control, that are based on the same biomechanical constraints. Our results demonstrate that joint torque requirements from standard inverse dynamics calculations are insufficient to define the activation of individual muscles during walking in healthy individuals. Identifying feasible muscle activation ranges may be an effective way to evaluate the impact of additional biomechanical and/or neural constraints on possible versus actual muscle activity in both normal and impaired movements. (C) 2015 Elsevier Ltd. All rights reserved.
机译：尽管由于肌肉骨骼冗余，可以使用无数种不同的肌肉激活模式来产生相同的运动，但是尚不清楚观察到的肌肉活动变化可偏离由生物力学模型计算出的最佳解的程度。在这里，我们使用详细的肌肉骨骼模型以及实验测量的动力学和运动学，研究了人类步行过程中单个肌肉的生物力学允许的激活水平范围。假设所有其他肌肉都可以根据需要改变其激活程度，则可行的肌肉激活范围将定义满足反向动力学关节扭矩的每条肌肉激活的最小和最大可能水平。在步行过程中，超过73％的步态周期中有73％的肌肉具有可行的肌肉激活范围，大于总肌肉激活范围的95％，这表明，个别情况下，大多数肌肉可能处于完全活动状态或完全不活动状态仍满足逆动力学联合扭矩。此外，可行的肌肉激活范围的形状与基于相同的生物力学约束的先前报告的肌肉激活模式或最佳解决方案（即静态优化和计算的肌肉控制）都不相似。我们的结果表明，标准逆动力学计算得出的关节扭矩要求不足以定义健康个体在行走过程中单个肌肉的激活。确定可行的肌肉激活范围可能是评估其他生物力学和/或神经约束对正常和受损运动中可能的与实际的肌肉活动影响的有效方法。 （C）2015 Elsevier Ltd.保留所有权利。

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