The effects of altering attentional demands of gait control on the variability of temporal and kinematic parameters
The effects of altering attentional demands of gait control on the variability of temporal and kinematic parameters
复制标题
改变步态控制的注意力需求对时间和运动参数变化的影响
DOI：
10.1016/j.gaitpost.2016.04.005
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发表时间：
2016
期刊：
影响因子：
2.4
通讯作者：
Shinkoda K
中科院分区：
文献类型：
--
作者：
Tanimoto K;Anan M;Sawada T;Takahashi M;Shinkoda K
本研究的目的是研究认知和视觉运动任务对步态控制的影响，包括步幅时间变异性的大小和时间结构，以及使用惯性传感器测量的下肢运动学。14名健康的年轻受试者在跑步机上以自己选择的步速行走15分钟，在三种情况下：正常行走，无并发任务；在执行认知任务时走路；以及在执行视觉运动任务时走路。由两腿的加速度和角速度数据生成步幅时间和峰值角速度的时间序列数据。计算了这些变量的时间序列均值、变异系数、分形标度指数α和整个跨步周期内小腿角速度的标准差。认知任务对跨步时间的长期相关性有影响，但对下肢运动学没有影响。跨步时间变异的时间结构在认知任务中变得更加随机。视觉运动任务对下肢运动有影响。在视觉运动任务中，受试者对摆动肢体的控制具有更大的可变性，并且具有更复杂的适应性下肢运动模式。双任务对步态控制的影响因步幅时间和下肢运动学的不同而不同。这些发现表明，变异的时间结构和下肢运动学是检测步态模式变化的有用参数，并为步态控制提供进一步的见解。
The purpose of this study was to investigate the effects of cognitive and visuomotor tasks on gait control in terms of the magnitude and temporal structure of the variability in stride time and lower-limb kinematics measured using inertial sensors. Fourteen healthy young subjects walked on a treadmill for 15 min at a self-selected gait speed in the three conditions: normal walking without a concurrent task; walking while performing a cognitive task; and walking while performing a visuomotor task. The time series data of stride time and peak shank angular velocity were generated from acceleration and angular velocity data recorded from both shanks. The mean, coefficient of variation, and fractal scaling exponentαof the time series of these variables and the standard deviation of shank angular velocity over the entire stride cycle were calculated. The cognitive task had an effect on long-range correlations in stride time but not on lower-limb kinematics. The temporal structure of variability in stride time became more random in the cognitive task. The visuomotor task had an effect on lower-limb kinematics. Subjects controlled their swing limb with greater variability and had a more complex adaptive lower-limb movement pattern in the visuomotor task. The effects of the dual tasks on gait control were different for stride time and lower-limb kinematics. These findings suggest that the temporal structure of variability and lower-limb kinematics are useful parameters to detect a change in gait pattern and provide further insight into gait control.