Phase resetting behavior in human gait is influenced by treadmill walking speed.
Phase resetting behavior in human gait is influenced by treadmill walking speed.
复制标题
人类步态的相位重置行为受到跑步机行走速度的影响。
DOI：
10.1016/j.gaitpost.2015.09.021
复制
发表时间：
2016
期刊：
影响因子：
2.4
通讯作者：
Milton,JohnG
中科院分区：
文献类型：
--
作者：
Nessler,JeffA;Spargo,Tavish;Craig-Jones,Andrew;Milton,JohnG
步态常被建模为一个极限环振荡器。当受到干扰时，这种类型的系统将以一种定型的方式重置其输出，这种方式可能会随着时间的推移而相对于其原始轨迹发生位移。与其他生物振荡器相比，对人类步态的相位重置特性知之甚少。由于人类必须经常调整步态以应对扰动，因此对这种行为的更好理解可能会降低跌倒的风险。本研究的目的是进一步评估人类步态的相位重置行为，特别强调(1)健康个体的相位重置反应的差异，(2)这种反应对步行速度的敏感性。17名健康受试者在跑步机上以每小时2.0英里、2.5英里和3.0英里的速度行走，同时他们的右肢每12-20步随机受到干扰。离散的机械扰动是由一根绳子施加的，绳子系在每个受试者的脚踝上，由一个电动手臂驱动。在一个选择的步幅中应用一次扰动，总是在摆动阶段的不同点上，并且记录在随后的步幅中发生的相移量。8名受试者的子集也以他们喜欢的步行速度在单独的一天进行另外3次试验，以提供受试者内部可变性的估计。结果表明，阶段重置行为在受试者之间相对一致，但阶段重置行为的微小变化可归因于不同跑步机速度的行走。
Gait is often modeled as a limit cycle oscillator. When perturbed, this type of system will reset its output in a stereotypical manner, which may be shifted in time with respect to its original trajectory. In contrast to other biological oscillators, relatively little is known regarding the phase resetting properties for human gait. Because humans must often reset their gait in response to perturbation, an improved understanding of this behavior may have implications for reducing the risk of fall. The purpose of this study was to further evaluate phase resetting behaviors in human gait with particular emphasis on (1) variance of the phase resetting response among healthy individuals and (2) the sensitivity of this response to walking speed. Seventeen healthy subjects walked on a treadmill at 2.0 mph, 2.5 mph, and 3.0 mph while their right limb was perturbed randomly every 12–20 strides. Discrete, mechanical perturbations were applied by a rope that was attached to each subject's ankle and actuated by a motorized arm. Perturbations were applied once during a select stride, always at a different point in the swing phase, and the amount of phase shift that occurred on the subsequent stride was recorded. A subset of 8 subjects also walked at their preferred walking speed for 3 additional trials on a separate day in order to provide an estimate of within-subjects variability. The results suggested that phase resetting behavior is relatively consistent among subjects, but that minor variations in phase resetting behavior are attributable to walking at different treadmill speeds.
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