Coulthard Jason T, Treen Tanner T, Oates Alison R, Lanovaz Joel L
College of Kinesiology, University of Saskatchewan, 87 Campus Drive, Saskatoon, SK S7N 5B2, Canada.
College of Kinesiology, University of Saskatchewan, 87 Campus Drive, Saskatoon, SK S7N 5B2, Canada.
Gait Posture. 2015 May;41(4):882-7. doi: 10.1016/j.gaitpost.2015.03.009. Epub 2015 Mar 21.
Functional tests, such as the timed-up-and-go (TUG), are routinely used to screen for mobility issues and fall risk. While the TUG is easy to administer and evaluate, its single time-to-completion outcome may not discriminate between different mobility challenges. Wearable sensors provide an opportunity to collect a variety of additional variables during clinical tests. The purpose of this study was to assess a new wearable inertial sensor system (iTUG) by investigating the effects of cognitive tasks in a dual-task paradigm on spatiotemporal and kinematic variables during the TUG. No previous studies have looked at both spatiotemporal variables and kinematics during dual-task TUG tests. 20 healthy young participants (10 males) performed a total 15 TUG trials with two different cognitive tasks and a normal control condition. Total time, along with spatiotemporal gait parameters and kinematics for all TUG subtasks (sit-to-stand, walking, turn, turn-to-sit), were measured using the inertial sensors. Time-to-completion from iTUG was highly correlated with concurrent manual timing. Spatiotemporal variables during walking showed expected differences between control and cognitive dual-tasks while trunk kinematics appeared to show more sensitivity to dual-tasks than reported previously in straight line walking. Non-walking TUG subtasks showed only minor changes during dual-task conditions indicating a possible attentional shift away from the cognitive task. Stride length and some variability measures were significantly different between the two cognitive tasks suggesting an ability to discriminate between tasks. Overall, the use of the iTUG system allows the collection of both traditional and potentially more discriminatory variables with a protocol that is easily used in a clinical setting.
功能测试，如定时起立行走测试（TUG），通常用于筛查行动能力问题和跌倒风险。虽然TUG测试易于实施和评估，但其单次完成时间的结果可能无法区分不同的行动能力挑战。可穿戴传感器为在临床测试期间收集各种额外变量提供了机会。本研究的目的是通过研究双重任务范式中的认知任务对TUG测试期间时空和运动学变量的影响，来评估一种新型可穿戴惯性传感器系统（iTUG）。此前尚无研究在双重任务TUG测试中同时考察时空变量和运动学。20名健康年轻参与者（10名男性）在两种不同的认知任务和正常对照条件下共进行了15次TUG试验。使用惯性传感器测量所有TUG子任务（从坐到站、行走、转身、转坐到站）的总时间以及时空步态参数和运动学。iTUG的完成时间与同时进行的人工计时高度相关。行走期间的时空变量在对照和认知双重任务之间显示出预期差异，而躯干运动学似乎比先前直线行走研究中报告的对双重任务更敏感。非行走TUG子任务在双重任务条件下仅显示出微小变化，表明注意力可能从认知任务上转移。两种认知任务之间的步长和一些变异性测量值存在显著差异，表明有区分任务的能力。总体而言，iTUG系统的使用允许通过一种易于在临床环境中使用的方案收集传统变量和可能更具区分性的变量。
