Gait adjustments in response to an obstacle are faster than voluntary reactions
Gait adjustments in response to an obstacle are faster than voluntary reactions
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DOI：
10.1016/j.humov.2004.08.011
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发表时间：
2004-10-01
影响因子：
2.1
通讯作者：
Duysens, J
中科院分区：
文献类型：
--
作者：
Weerdesteyn, V;Nienhuis, B;Duysens, J
据报道，步态期间的避障反应具有非常短的潜伏期。这就提出了一个问题，即大脑皮层是否也参与其中，就像它参与自主反应一样。本研究测定了避障反应时间，并将避障反应时间与自主步幅调整时间和手、脚简单反应时相关。25名健康的年轻人参加了这项研究。当他们在跑步机上行走时，一个障碍物突然落在他们的左腿前。对障碍物的第一反应是脚的微分加速度曲线偏离控制信号的时刻。OA反应潜伏期平均122ms（SD 14ms）。注意到两种非常不同的回避反应（步幅的延长和缩短），但对OA潜伏期没有回避策略效应。OA潜伏期明显短于自主步幅调整的潜伏期和手、脚的简单反应时间。短的OA潜伏期不仅可以从任务的动态性质来解释。这表明，皮层下通路可能参与避障。(C)2004 Elsevier B.V.保留所有权利。
It has been reported that obstacle avoidance reactions during gait have very short latencies. This raises the question whether the cortex can be involved, as it is in voluntary reactions. In this study, latencies of obstacle avoidance (OA) reactions were determined and related to latencies of voluntary stride modifications and simple reaction times (SRT) of hand and foot. Twenty-five healthy young adults participated in this study. While they were walking on the treadmill, an obstacle suddenly fell in front of their left leg. The first reaction to the obstacle was the moment at which the differentiated acceleration curve of the foot deviated from the control signal. Latencies of OA reactions were 122ms (SD 14ms) on average. Two very different avoidance reactions (lengthening and shortening of the stride) were noticed, but there was no avoidance strategy effect on OA latencies. OA latencies were significantly shorter as compared to latencies of voluntary stride modifications and simple reaction times of hand and foot. The short OA latencies could not only be explained from the dynamic nature of the task. It is suggested that subcortical pathways might be involved in obstacle avoidance. (C) 2004 Elsevier B.V. All rights reserved.