Multiple walking speed-frequency relations are predicted by constrained optimization
Multiple walking speed-frequency relations are predicted by constrained optimization
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DOI：
10.1006/jtbi.2001.2279
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发表时间：
2001-04-21
影响因子：
2
通讯作者：
Ruina, A
中科院分区：
文献类型：
--
作者：
Bertram, JEA;Ruina, A
一个人被限制在跑步机上以给定的速度v行走，选择特定的步频f和步长d = v/f。在一定的速度范围内进行测试会产生速度-频率（v-f）关系。这种关系通常被认为是人类步态的基本特征。通常进一步假设，该曲线遵循最小能量成本策略。我们观察到，在不同的约束条件下行走的个体--以固定的节拍器频率范围行走（固定f）或在间隔标记的范围内行走（固定d）--产生的速度-频率关系不同于受约束的v关系。我们在这里表明，三个不同的速度-频率曲线，类似于所观察到的，预测的假设，一个步行的人优化的基本目标函数F（v，f），具有最小的首选步态。此外，运输的代谢成本是函数F的合理近似候选。(C)北京：科学出版社.
A person constrained to walk at a given speed v on a treadmill, chooses a particular step frequency f and step length d = v/f. Testing over a range of speeds generates a speed-frequency (v-f) relationship. This relationship is commonly posited as a basic feature of human gait. It is often further posited that this curve follows from minimum energy cost strategy. We observed that individuals walking under different constraint circumstances-walking to a range of fixed metronome frequencies (fixed f) or over a range of spaced markers (fixed d)-produce speed-frequency relations distinct from the constrained v relation. We show here that three distinct speed-frequency curves, similar to those observed, are predicted by the assumption that a walking person optimizes an underlying objective function F(v,f) that has a minimum at the preferred gait. Further, the metabolic cost of transport is a reasonable approximate candidate for the function F. (C) 2001 Academic Press.