A simple model of bipedal walking predicts the preferred speed-step length relationship
A simple model of bipedal walking predicts the preferred speed-step length relationship
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DOI：
10.1115/1.1372322
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发表时间：
2001-06-01
影响因子：
1.7
通讯作者：
Kuo, AD
中科院分区：
文献类型：
--
作者：
Kuo, AD
我们使用了一个简单的被动动态行走模型，加上主动驱动人类。我们测试了几种假设的代谢成本，一个组件比例摆动腿。对于第二个组件，基于摆动腿所需的力的量除以力的持续时间的成本比其他成本（如摆动腿所做的机械功的量）更好地预测了首选的速度-步长关系。力/时间的成本模拟了在短时间内为大力量招募快速肌肉纤维的需求。摆动腿上的肌肉所做的实际机械功似乎相对不那么重要，尽管在接近等距的条件下，肌肉活动的短时间爆发似乎可以将其最小化。脚趾机械功和力除以时间的组合最小化预测了首选的速度-步长关系。
We used a simple model of passive dynamic walking, with the addition of active powering humans. We tested several hypothetical metabolic costs, with one component proportional swing leg. For this second component, a cost based on the amount of force needed to oscillate the leg divided by the rime duration of that force predicts the preferred speed-step length relationship much better than other costs, such as the amount of mechanical work done in swinging the leg. The cost of force/time models the need to recruit fast muscle fibers for large forces at short durations. The actual mechanical work performed by muscles on the swing leg appears to be of relatively less importance, although it appears to be minimized by the use of short bursts of muscle activity in near-isometric conditions. The combined minimization of toe-off mechanical work and force divided by rime predicts the preferred speed-step length relationship.