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首页> 外文期刊>Journal of Biomechanics >Analysis of dual-task elderly gait in fallers and non-fallers using wearable sensors
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Analysis of dual-task elderly gait in fallers and non-fallers using wearable sensors

机译：使用可穿戴传感器分析衰落和非衰落的双重任务老年步态

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Dual-task (DT) gait involves walking while simultaneously performing an attention-demanding task and can be used to identify impaired gait or executive function in older adults. Advancment is needed in techniques that quantify the influence of dual tasking to improve predictive and diagnostic potential. This study investigated the viability of wearable sensor measures to identify DT gait changes in older adults and distinguish between elderly fallers and non-fallers. A convenience sample of 100 older individuals (75.5 +/- 6.7 years; 76 non-fallers, 24 fallers based on 6 month retrospective fall occurrence) walked 7.62 m under single-task (ST) and DT conditions while wearing pressure-sensing insoles and tri-axial accelerometers at the head, pelvis, and left and right shanks. Differences between ST and DT gait were identified for temporal measures, acceleration descriptive statistics, Fast Fourier Transform (FFT) quartiles, ratio of even to odd harmonics, center of pressure (CoP) stance path coefficient of variation, and deviations to expected CoP stance path. Increased posterior CoP stance path deviations, increased coefficient of variation, decreased FFT quartiles, and decreased ratio of even to odd harmonics suggested increased DT gait variability. Decreased gait velocity and decreased acceleration standard deviations (SD) at the pelvis and shanks could represent compensatory gait strategies that maintain stability. Differences in acceleration between fallers and non-fallers in head posterior SD and pelvis AP ratio of even to odd harmonics during ST, and pelvis vertical maximum Lyapunov exponent during DT gait were identified. Wearable-sensor-based DT gait assessments could be used in point-of-care environments to identify gait deficits. (C) 2016 Elsevier Ltd. All rights reserved.
机译：双重任务（DT）步态涉及行走，同时执行注意力的任务，可用于识别老年人的步态受损或执行功能。在量化双重任务的影响提高预测和诊断潜力的技术中需要进步。本研究调查了可穿戴传感器措施的可行性，以识别老年人的DT步态变化，并区分老年衰落和非衰退。 100个老年人的便利样本（75.5 +/- 6.7岁; 76个非衰退，基于6个月回顾性的24次衰退）在一次任务（ST）和DT条件下在一次任务（ST）和DT条件下走了7.62米，而佩戴压力传感鞋垫头部，骨盆和左侧和右柄处的三轴加速度计。确定ST和DT步态之间的差异用于时间测量，加速描述性统计，快速傅里叶变换（FFT）四分位数，均匀谐波，压力中心（COP）姿态路径系数的变化，以及预期的COP姿态路径的偏差。增加后座位姿势路径偏差，增加的变异系数，降低的FFT四分位数，并且均匀于奇次谐波的减少表明DT步态变异增加。在骨盆和柄处减少步态速度和减少的加速标准偏差（SD）可以代表维持稳定的补偿性步态策略。鉴定了在ST的衰落和脑后衰落和骨盆下降和骨盆的非衰落中的加速度的差异，并且鉴定了DT步态期间的奇次谐波和骨盆垂直最大Lyapunov指数。可穿戴传感器的DT步态评估可用于护理点环境以识别步态赤字。 （c）2016 Elsevier Ltd.保留所有权利。

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