Validity and repeatability of inertial measurement units for measuring gait parameters.
Validity and repeatability of inertial measurement units for measuring gait parameters.
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DOI：
10.1016/j.gaitpost.2017.04.013
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发表时间：
2017-06
期刊：
影响因子：
2.4
通讯作者：
Krishnan C
中科院分区：
文献类型：
--
作者：
Washabaugh EP;Kalyanaraman T;Adamczyk PG;Claflin ES;Krishnan C
惯性测量单元(IMU)是一种小型可穿戴传感器，在临床步态分析中具有巨大的应用潜力。它们允许在临床和研究实验室之外对步态和运动障碍进行客观评估，并允许对大量步骤进行评估。然而，这些系统的重复性和有效性数据对于步态度量来说是稀疏的。本研究的目的是确定用APDM Opal Imus和Mobility Lab系统测量的时空指标(步速、站立百分比、摆动百分比、步态周期时间、步长、节奏和步长)的有效性和日间重复性。我们收集了39名健康受试者的数据。受试者在两天多的时间里在标准跑步机、分带式跑步机或地面上行走，IMU放置在两个位置：两只脚和两个脚踝。用IMU系统进行的时空测量与仪表式跑步机的数据或使用标准的临床程序进行了验证。计算系统的重复性和最小可检测变化(MDC)。IMUS在测量大多数测试的步态指标时显示出高到中等的有效性。此外，当在跑步机和地面上使用时，这些测量似乎是可重复的。IMUS的脚部配置似乎能更好地测量步态参数；然而，脚部和脚踝的配置都显示出良好的重复性。总之，这项研究中的IMU系统在测量健康年轻人的时空步态参数方面似乎既准确又可重复。
Inertial measurement units (IMUs) are small wearable sensors that have tremendous potential to be applied to clinical gait analysis. They allow objective evaluation of gait and movement disorders outside the clinic and research laboratory, and permit evaluation on large numbers of steps. However, repeatability and validity data of these systems are sparse for gait metrics. The purpose of this study was to determine the validity and between-day repeatability of spatiotemporal metrics (gait speed, stance percent, swing percent, gait cycle time, stride length, cadence, and step duration) as measured with the APDM Opal IMUs and Mobility Lab system. We collected data on 39 healthy subjects. Subjects were tested over two days while walking on a standard treadmill, split-belt treadmill, or overground, with IMUs placed in two locations: both feet and both ankles. The spatiotemporal measurements taken with the IMU system were validated against data from an instrumented treadmill, or using standard clinical procedures. Repeatability and minimally detectable change (MDC) of the system was calculated between days. IMUs displayed high to moderate validity when measuring most of the gait metrics tested. Additionally, these measurements appear to be repeatable when used on the treadmill and overground. The foot configuration of the IMUs appeared to better measure gait parameters; however, both the foot and ankle configurations demonstrated good repeatability. In conclusion, the IMU system in this study appears to be both accurate and repeatable for measuring spatiotemporal gait parameters in healthy young adults.
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