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首页> 外文期刊>Journal of Biomechanics >Modeling muscle activity to study the effects of footwear on the impact forces and vibrations of the human body during running.
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Modeling muscle activity to study the effects of footwear on the impact forces and vibrations of the human body during running.

机译：对肌肉活动进行建模，以研究鞋类在跑步过程中对人体的冲击力和振动的影响。

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摘要

A previously developed mass-spring-damper model of the human body is improved in this paper, taking muscle activity into account. In the improved model, a nonlinear controller mimics the functionality of the Central Nervous System (CNS) in tuning the mechanical properties of the soft-tissue package. Two physiological hypotheses are used to determine the control strategies that are used by the controller. The first hypothesis (constant-force hypothesis) postulates that the CNS uses muscle tuning to keep the ground reaction force (GRF) constant regardless of shoe hardness, wherever possible. It is shown that the constant-force hypothesis can explain the existing contradiction about the effects of shoe hardness on the GRF during running. This contradiction is emerged from the different trends observed in the experiments on actual runners, and experiments in which the leg was fixed and exposed to impact. While the GRF is found to be dependent on shoe hardness in the former set of experiments, no such dependency was observed in the latter. According to the second hypothesis, the CNS keeps the level of the vibrations of the human body constant using muscle tuning. The results of the study show that this second control strategy improves the model such that it can correctly simulate the effects of shoe hardness on the vibrations of the human body during running.
机译：考虑到肌肉活动，本文改进了先前开发的人体质量弹簧阻尼器模型。在改进的模型中，非线性控制器模仿中枢神经系统（CNS）的功能来调整软组织包装的机械性能。使用两个生理假设来确定控制器使用的控制策略。第一个假设（恒力假设）假设CNS在任何可能的情况下都使用肌肉调整来使地面反作用力（GRF）保持恒定而与鞋子的硬度无关。结果表明，恒定力假设可以解释跑步过程中鞋子硬度对GRF影响的矛盾。从在实际跑步者的实验中观察到的不同趋势中发现了这种矛盾，在实际实验中，腿部被固定并受到冲击。虽然在前一组实验中发现GRF取决于鞋的硬度，但在后一组实验中未观察到这种依赖性。根据第二种假设，中枢神经系统通过肌肉调整使人体的振动水平保持恒定。研究结果表明，该第二种控制策略改进了模型，从而可以正确模拟鞋子硬度对跑步过程中人体振动的影响。

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