Stride-to-stride variability while enumerating animal names among healthy young adults: Result of stride velocity or effect of attention-demanding task?
Stride-to-stride variability while enumerating animal names among healthy young adults: Result of stride velocity or effect of attention-demanding task?
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DOI：
10.1016/j.gaitpost.2007.03.011
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发表时间：
2008-01-01
期刊：
影响因子：
2.4
通讯作者：
Beauchet, Olivier
中科院分区：
文献类型：
--
作者：
Dubost, Veronique;Annweiler, Cedric;Beauchet, Olivier
背景资料：与人类行走中的平衡阶段控制相比，参与控制与行走相关的有节奏的步进机制的注意力仍然不清楚。同时双任务相关的步幅速度下降，增加步幅步幅的变化已被观察到，并解释为干扰引起的注意力资源的竞争需求。它还表明，步幅时间变异性取决于步幅速度，而步幅长度变异性和步幅速度之间的关系仍然存在争议。目前尚不清楚双任务相关的步幅时间和步幅长度变异性的变化是否是由步幅速度和/或注意要求任务的影响引起的目的：确定步幅速度和注意要求任务对双任务相关的步幅时间和步幅长度变异性变化的各自作用。平均步速，平均，使用移动设备Physilog（R）收集40名健康年轻人在自行步行时的步幅时间和步幅长度的标准差和变异系数。结果：边走边列举动物名称引起步态显著变化，但对认知任务表现无显著影响。重复测量设计的协方差平衡分析表明，在双任务条件下，步幅时间变异性显著增加，而步幅长度变异性在双任务条件下没有变化，这与双任务相关的步幅速度下降无关。这些结果表明，双任务相关的步幅时间变异性的增加取决于注意力要求的任务，而不是步幅速度，提示健康的年轻人在正常的自主选择的步行速度下，将他们的部分注意力用于控制节奏性步进机制。(c)2007 Elsevier B. V.保留所有权利。
Background: The involvement of attention in the control of the walking-related rhythmic stepping mechanism remains unclear in contrast to control of balance phases in human walking. Concurrently to the dual-task related decrease in stride velocity, an increased stride-to-stride variability has been observed and interpreted as interference caused by competing demands for attention resources. It has been also shown that stride time variability depends on stride velocity, whereas the relationship between stride length variability and stride velocity remains controversial. It remains unknown whether dual-task related changes in stride time and stride length variability result from an effect of stride velocity and/or of the attention-demanding task.Objective: To determine the respective roles of stride velocity and attention-demanding task on dual-task related changes in stride time and stride length variability.Methods: Mean stride velocity, mean, standard deviation and coefficient of variation of stride time and stride length were collected using the ambulatory device Physilog (R) in 40 healthy young adults while walking at self-selected speed and while walking with enumerating animal names.Results: Enumerating animal names while walking provoked significant changes in gait but not in cognitive task performance. Balanced analyses of covariance with a repeated measures design showed that stride time variability increased significantly under dual-task condition independently of dual-task related decrease in stride velocity, while stride length variability did not change under dual-task.Conclusion: These results show that the dual-task related increase in stride time variability depends on the attention-demanding task rather than stride velocity, suggesting that healthy young adults devote a part of their attention to the control of the rhythmic stepping mechanism at normal self-selected walking speed. (c) 2007 Elsevier B.V. All rights reserved.