跑台步行过程中时空步态参数短期控制的不对称性
Asymmetry of short-term control of spatio-temporal gait parameters during treadmill walking
摘要：
能量成本的优化决定了步态时空参数的平均值，如步长，步长或步速。然而，在行走过程中，人类需要在每一步调整这些参数，以响应外源性和/或内源性扰动。虽然我们已经知道了一些触发这些反应的神经机制，但我们对逐步适应的基本原则的理解仍然难以捉摸。我们确定了20名右脚偏好的健康受试者在跑步机上以1.1，1.4和1.7 m/s的速度行走时的步态参数。我们发现，当步态参数的值明显大于（小于）的平均值，它要么是紧随其后的对侧腿（interleg控制）的一个较小（较大）的值，或从平均值的偏差减少在同侧腿（intraleg控制）的下一个运动。在这种瞬态控制事件期间，以独特的方式执行步骤持续时间的选择和步长的选择。我们量化了步态参数的短期控制的对称性，并观察到右腿在较高速度（1.4和1.7 m/s）下对所有三个参数的短期控制中的显着优势。
英文摘要：
Optimization of energy cost determines average values of spatio-temporal gait parameters such as step duration, step length or step speed. However, during walking, humans need to adapt these parameters at every step to respond to exogenous and/or endogenic perturbations. While some neurological mechanisms that trigger these responses are known, our understanding of the fundamental principles governing step-by-step adaptation remains elusive. We determined the gait parameters of 20 healthy subjects with right-foot preference during treadmill walking at speeds of 1.1, 1.4 and 1.7 m/s. We found that when the value of the gait parameter was conspicuously greater (smaller) than the mean value, it was either followed immediately by a smaller (greater) value of the contralateral leg (interleg control), or the deviation from the mean value decreased during the next movement of ipsilateral leg (intraleg control). The selection of step duration and the selection of step length during such transient control events were performed in unique ways. We quantified the symmetry of short-term control of gait parameters and observed the significant dominance of the right leg in short-term control of all three parameters at higher speeds (1.4 and 1.7 m/s).
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