Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY, USA.
Department of Mechanical Engineering, School of Engineering and Applied Science, Columbia University, New York, NY, USA.
Top Stroke Rehabil. 2024 Apr;31(3):235-243. doi: 10.1080/10749357.2023.2240584. Epub 2023 Aug 6.
The ability to objectively measure spatiotemporal metrics within individuals post-stroke is integral to plan appropriate intervention, track recovery, and ultimately improve efficacy of rehabilitation programs. Inertial measurement units (IMUs) provide a means to systematically collect gait-specific metrics that could not otherwise be obtained from clinical outcomes. However, the use of IMUs to measure spatiotemporal parameters in stroke survivors has yet to be validated. The purpose of this study is to determine the validity and reliability of IMU-recorded spatiotemporal gait metrics as compared to a motion capture camera system (MCCS) in individuals post-stroke.
Participants ( = 23, M/F = 12/11, mean (SD) age = 50.2(11.1) spatiotemporal data were collected simultaneously from a MCCS and APDM Opal IMUs during a five-minute treadmill walking task at a self-selected speed. Criterion validity and test-retest reliability were assessed using Lin's concordance correlation coefficients (CCCs) and intraclass correlation coefficients (ICCs), respectively. Spatiotemporal values from MCCS and IMU were used to calculate gait asymmetry, and a t-test was used to assess the difference between asymmetry values.
There were fair-to-excellent agreement between IMU and MCCS of temporal parameters (CCC 0.56-0.98), excellent agreement of spatial parameters (CCC >0.90), and excellent test-retest reliability for all parameters (ICC >0.90).
Compared to motion capture, the APDM Opal IMUs produced accurate and reliable measures of spatiotemporal parameters. Findings support the use of IMUs to assess spatiotemporal parameters in individual's post-stroke.
客观测量卒中后个体的时空度量对于制定适当的干预措施、跟踪恢复情况以及最终提高康复计划的效果至关重要。惯性测量单元（IMU）提供了一种系统地收集特定步态的指标的方法，而这些指标是无法从临床结果中获得的。然而，IMU 用于测量卒中幸存者的时空参数尚未得到验证。本研究的目的是确定与运动捕捉相机系统（MCCS）相比，IMU 记录的时空步态指标在卒中后个体中的有效性和可靠性。
本研究共纳入 23 名参与者（M/F=12/11，平均（标准差）年龄=50.2（11.1）岁），在自我选择的速度下进行 5 分钟跑步机行走任务时，同时从 MCCS 和 APDM Opal IMU 收集时空数据。使用 Lin 的一致性相关系数（CCCs）和组内相关系数（ICCs）分别评估标准效度和测试-重测信度。使用 MCCS 和 IMU 的时空值计算步态不对称性，并使用 t 检验评估不对称值之间的差异。
IMU 和 MCCS 的时间参数（CCC 0.56-0.98）之间存在良好到极好的一致性，空间参数（CCC >0.90）之间存在极好的一致性，所有参数的测试-重测信度均极好（ICC >0.90）。
与运动捕捉相比，APDM Opal IMU 产生了时空参数的准确和可靠的测量值。这些发现支持使用 IMU 评估卒中后个体的时空参数。
