J Sport Rehabil. 2019 Aug 1;28(6). doi: 10.1123/jsr.2018-0295.
Wearable sensor devices have notable advantages, such as cost-effectiveness, easy to use, and real-time feedback. Wirelessness ensures full-body motion, which is required during movement in a challenging environment such as during sports. Research on the reliability and validity of commercially available systems, however, is indispensable.
To confirm the test-retest reliability and concurrent validity of a commercially available body-worn sensor-BTS G-WALK® sensor system-for spatiotemporal gait parameters with the GAITRite® walkway system as golden standard.
Reliability and concurrent validity study.
Laboratory setting.
Thirty healthy subjects.
Spatiotemporal parameters: speed, cadence, stride length, stride duration, stance duration, swing duration, double support, and single support.
In terms of test-retest reliability of the BTS G-WALK® sensor system, intraclass correlation coefficient values for both the spatial and temporal parameters were excellent between consecutive measurements on the same day with intraclass correlation coefficient values ranging from .85 to .99. In terms of validity, intraclass correlation coefficient values between measurement systems showed excellent levels of agreement for speed, cadence, stride length, and stride duration (range = .88-.97), and showed poor to moderate levels of agreement (range = .12-.47) for single/double support and swing/stance duration. Bland-Altman plots showed overall percentage bias values equal to or smaller than 3% with limits of agreement ≤15% (speed, cadence, stride length, stride duration, swing duration, and stance duration). Only for single and double support, the limits of agreement were higher with, respectively, -15.4% to 19.5% and -48.0% to 51.4%.
The BTS G-WALK® sensor system is reliable for all measured spatiotemporal parameters. In terms of validity, excellent concurrent validity was shown for speed, cadence, stride length, and stride duration. Cautious interpretation is necessary for temporal parameters based on final foot contact (stance, swing, and single/double support time).
可穿戴传感器设备具有成本效益高、使用方便、实时反馈等显著优势。无线性确保了全身运动，这在运动等具有挑战性的环境中是必需的。然而，对商业可用系统的可靠性和有效性的研究是不可或缺的。
用 GAITRite®步道系统作为金标准，确认一种商用体戴传感器-BTS G-WALK®传感器系统的时空步态参数的测试-重测信度和同时效度。
可靠性和同时效度研究。
实验室设置。
30 名健康受试者。
时空参数：速度、步频、步长、步幅时间、支撑时间、摆动时间、双支撑和单支撑。
BTS G-WALK®传感器系统的测试-重测信度方面，在同一天的连续测量中，空间和时间参数的组内相关系数值均为极好，组内相关系数值范围为.85 至.99。在有效性方面，测量系统之间的组内相关系数值显示出速度、步频、步长和步幅时间的极好水平的一致性（范围为.88-.97），而单/双支撑和摆动/支撑时间的一致性则为差到中度（范围为.12-.47）。Bland-Altman 图显示总体百分比偏差值等于或小于 3%，一致性界限≤15%（速度、步频、步长、步幅时间、摆动时间和支撑时间）。只有单支撑和双支撑的一致性界限较高，分别为-15.4%至 19.5%和-48.0%至 51.4%。
BTS G-WALK®传感器系统对于所有测量的时空参数都是可靠的。在有效性方面，速度、步频、步长和步幅时间显示出极好的同时效度。基于最终脚触（支撑、摆动和单/双支撑时间），对时间参数的解释应谨慎。
