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首页> 外文期刊>Gait & posture >Kinetic mechanisms to alter walking speed.
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Kinetic mechanisms to alter walking speed.

机译：改变步行速度的动力学机制。

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摘要

A mechanism to modulate speed during human walking has not yet been proposed in the literature, even though changing walking speed is likely a necessary attribute of everyday ambulation. To understand how joint kinetics modulate walking speed 12 normal adults walked Fast (1.4m/s), Slow (1.0m/s), Accel (1.0-1.4m/s) and Decel (1.4-1.0m/s) trials while full body 3D kinematics and kinetics were collected. Reduced sagittal ankle plantarflexor moments were observed in Accel trials during early single limb stance (p<0.001) and increased sagittal plantarflexor moments were seen in Decel trials during early single limb stance (p<0.001) compared to steady speed walking. Modulating the sagittal ankle moment altered the center of pressure location and either attenuated (Accel) or accentuated (Decel) the early stance braking impulse to accelerate or decelerate the center of mass. The onset of walking speed changes occurred at approximately 15% of the gait cycle and did not support the concept of "controlled falling". Sagittal ankle push-off power appears a consequence of increased walking speed, but not the causative factor to increase walking speed.
机译：尽管改变步行速度可能是日常步行的必要属性，但尚未在文献中提出调节人体步行过程中速度的机制。了解关节动力学如何调节步行速度12名正常成年人在充满时进行快（1.4m / s），慢（1.0m / s），加速（1.0-1.4m / s）和减速（1.4-1.0m / s）试验收集了人体3D运动学和动力学。与稳定速度行走相比，在早期单肢姿势期间的Accel试验中观察到矢状踝plant屈力矩减少（p <0.001），在Decel试验中在早期肢体姿势观察到矢状踝plant屈力矩增加（p <0.001）。调节矢状踝力矩会改变压力位置的中心，并减弱（加速）或加重（减速）早期的姿态制动脉冲，以加速或减速质量中心。步行速度变化的发作大约发生在步态周期的15％处，并不支持“控制性跌倒”的概念。矢状踝推力似乎是步行速度增加的结果，但不是步行速度增加的原因。

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