Wearable Sensor System to Measure Velocity Adaptive Variability for Continuous Human Mobility Monitoring

Ik-Hyun Youn, Jong-Hoon Youn, A. Patlolla
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Abstract

Variability of human mobility has become an important identifier for the assessment of human motor performance. For example, abnormally increased variability during movement has shown to correlate with higher falling risk. Various gait parameters, such as step length, stride time, and joint angle velocity have been studied to reveal the link between variability and movement impairment under the hospital or laboratory environments. Although the accuracy of the measurements with the laboratory equipment is relatively high and reliable, spatiotemporal limitation and lack of representativeness of ordinary mobility characteristics of a subject have been major challenges of previous approaches. This study proposes the velocity adaptive variability parameter to overcome the listed limitations. Among several major factors that affect level of variability, such as kinematic, pathological, and physiological changes, the parameter specifically absorbs the impact of varied walking speeds to get an instinct variability signature from the same subject regardless of walking speed. Since we utilize a single inertial sensor to measure variability of the subject, the approach will enable us to continuously monitor mobility-related problems in a free-living environment. The proof of concept experiment has shown practical advantages of our approach, and we also expect that the adaptive variability can be applied to future continuous mobility monitoring research.
测量速度自适应变化的可穿戴传感器系统,用于连续的人体移动监测
人体活动的可变性已成为评估人体运动性能的重要标志。例如,运动过程中异常增加的可变性与较高的跌倒风险相关。各种步态参数,如步长、步幅时间和关节角速度已被研究,以揭示变异性与医院或实验室环境下运动障碍之间的联系。虽然使用实验室设备测量的精度相对较高且可靠,但时空限制和缺乏对受试者普通流动性特征的代表性一直是以往方法的主要挑战。本文提出了速度自适应变率参数来克服上述局限性。在运动、病理和生理变化等影响可变性水平的几个主要因素中,该参数专门吸收不同行走速度的影响,从而获得同一受试者无论行走速度如何的本能可变性特征。由于我们使用单个惯性传感器来测量受试者的可变性,因此该方法将使我们能够在自由生活环境中持续监测与移动相关的问题。概念验证实验表明了该方法的实际优势,并期望该自适应变异性可以应用于未来的连续移动监测研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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