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首页> 外文期刊>Journal of Biomechanics >Contributions of muscles to mediolateral ground reaction force over a range of walking speeds
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Contributions of muscles to mediolateral ground reaction force over a range of walking speeds

机译：在一定的步行速度范围内，肌肉对中外侧地面反作用力的贡献

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Impaired control of mediolateral body motion during walking is an important health concern. Developing treatments to improve mediolateral control is challenging, partly because the mechanisms by which muscles modulate mediolateral ground reaction force (and thereby modulate mediolateral acceleration of the body mass center) during unimpaired walking are poorly understood. To investigate this, we examined mediolateral ground reaction forces in eight unimpaired subjects walking at four speeds and determined the contributions of muscles, gravity, and velocity-related forces to the mediolateral ground reaction force by analyzing muscle-driven simulations of these subjects. During early stance (0-6% gait cycle), peak ground reaction force on the leading foot was directed laterally and increased significantly (p<0.05) with walking speed. During early single support (14-30% gait cycle), peak ground reaction force on the stance foot was directed medially and increased significantly (p<0.01) with speed. Muscles accounted for more than 92% of the mediolateral ground reaction force over all walking speeds, whereas gravity and velocity-related forces made relatively small contributions. Muscles coordinate mediolateral acceleration via an interplay between the medial ground reaction force contributed by the abductors and the lateral ground reaction forces contributed by the knee extensors, plantarflexors, and adductors. Our findings show how muscles that contribute to forward progression and body-weight support also modulate mediolateral acceleration of the body mass center while weight is transferred from one leg to another during double support.
机译：步行过程中对中外侧身体运动的控制受损是重要的健康问题。开发改善前外侧控制的治疗方法具有挑战性，部分原因是人们对在无障碍步行过程中肌肉调节后外侧地面反作用力（从而调节体重中心的后外侧加速度）的机制了解甚少。为了对此进行研究，我们检查了八名以四种速度行走的未受损受试者的中外侧地面反作用力，并通过分析这些受试者的肌肉驱动模拟确定了肌肉，重力和速度相关力对中外侧地面反作用力的贡献。在早期姿势（步态为0-6％的步态）期间，前脚上的地面最大反作用力指向横向，并随步行速度显着增加（p <0.05）。在早期单次支撑（步态周期为14-30％）期间，站立脚的地面最大反作用力指向内侧，并随速度显着增加（p <0.01）。在所有步行速度中，肌肉占中外侧地面反作用力的92％以上，而与重力和速度有关的力贡献较小。肌肉通过外展肌所贡献的内侧地面反作用力与膝盖伸肌、,屈肌和内收肌所贡献的外侧地面反作用力之间的相互作用来协调中外侧的加速度。我们的发现表明，在双支撑过程中，重量从一条腿转移到另一条腿时，有助于向前发展和体​​重支撑的肌肉也如何调节重心的中外侧加速度。

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