Sports Medicine Research Institute, College of Health Sciences, University of Kentucky, Lexington, KY, United States of America.
Physiol Meas. 2020 May 4;41(4):045002. doi: 10.1088/1361-6579/ab8050.
To investigate the influence of cognitive dual-tasks on dynamic postural sway variability, measured with a single inertial measurement unit, in healthy collegiate athletes during dual-task gait.
Thirty-four athletes ambulated down and back a 10-meter course. Root mean square values of postural sway acceleration were calculated for four sway-planes. Single and dual-task trial times were calculated from gait initiation to termination. Single and dual-task root mean square values were compared using Wilcoxon signed rank tests for each sway plane to determine significance. The relative difference between each sway measures and trial times for single and dual-task gait (i.e. dual-task cost was calculated). Spearman's correlation was used to analyze the association between dual-task cost of sway and trial time data.
During dual-task conditions, participants ambulated slower and demonstrated a significant reduction in root mean square sway in all planes of motion. The greatest decreases were in the medial-lateral (Z = -4.83, p < 0.001, ES = -0.83) and superior-inferior planes (Z = -4.93, p < 0.001, ES = -0.85). Increased trial time cost was associated with a decrease in dual-task cost of postural sway (p < 0.05).
Performing a cognitive task while ambulating decreased postural sway variability in task-relevant planes of motion compared to single-task conditions. Reduced dual-task cost of sway variability during gait was associated with maintained trial times between single and dual-tasks. These data support the use of instrumented dual-task gait assessment to evaluate postural sway variability.
研究认知双重任务对健康大学生在双重任务步态时使用单一惯性测量单元测量的动态姿势摆动变异性的影响。
34 名运动员在 10 米的跑道上往返行走。计算了四个摆动平面的姿势摆动加速度均方根值。从步态开始到结束计算单任务和双重任务的试验时间。使用 Wilcoxon 符号秩检验比较每个摆动平面的单任务和双重任务的均方根值，以确定显著性。计算单任务和双重任务步态的每个摆动测量值和试验时间的相对差异（即计算双重任务成本）。使用 Spearman 相关分析来分析摆动的双重任务成本与试验时间数据之间的关联。
在双重任务条件下，参与者的步态速度较慢，所有运动平面的均方根摆动幅度均显著减小。最大的减小发生在横向（Z = -4.83，p < 0.001，ES = -0.83）和上下平面（Z = -4.93，p < 0.001，ES = -0.85）。试验时间成本的增加与姿势摆动的双重任务成本的减少相关（p < 0.05）。
与单任务条件相比，在行走时执行认知任务会降低与任务相关的运动平面中的姿势摆动变异性。行走时摆动变异性的双重任务成本降低与单任务和双重任务之间的试验时间保持相关。这些数据支持使用仪器化双重任务步态评估来评估姿势摆动变异性。
