Fleron Martin Kokholm, Ubbesen Niels Christian Hauerbach, Battistella Francesco, Dejtiar David Leandro, Oliveira Anderson Souza
a Faculty of Medicine, Department of Health Science and Technology , Aalborg University , Aalborg , Denmark.
b Faculty of Engineering and Science, Department of Materials and Production , Aalborg University , Aalborg , Denmark.
Sports Biomech. 2019 Aug;18(4):366-377. doi: 10.1080/14763141.2017.1409259. Epub 2018 Jan 12.
Motion capture through inertial sensors is becoming popular, but its accuracy to describe kinematics during changes in walking speed is unknown. The aim of this study was to determine the accuracy of trunk speed extracted using an inertial motion system compared to a gold standard optical motion system, during steady walking and stationary periods. Eleven participants walked on pre-established paths marked on the floor. Between each lap, a 1-second stationary transition period at the initial position was included prior to the next lap. Resultant trunk speed during the walking and transition periods were extracted from an inertial (240 Hz sampling rate) and an optical system (120 Hz sampling rate) to calculate the agreement (Pearson's correlation coefficient) and relative root mean square errors between both systems. The agreement for the resultant trunk speed between the inertial system and the optical system was strong (0.67 < ≤ 0.9) for both walking and transition periods. Moreover, relative root mean square error during the transition periods was greater in comparison to the walking periods (>40% across all paths). It was concluded that trunk speed extracted from inertial systems have fair accuracy during walking, but the accuracy was reduced in the transition periods.
通过惯性传感器进行运动捕捉正变得越来越流行，但其在步行速度变化过程中描述运动学的准确性尚不清楚。本研究的目的是确定在稳定步行和静止期间，与金标准光学运动系统相比，使用惯性运动系统提取的躯干速度的准确性。11名参与者在预先标记在地板上的路径上行走。每圈之间，在下一圈之前，在初始位置包括1秒的静止过渡阶段。从惯性系统（采样率240Hz）和光学系统（采样率120Hz）中提取步行和过渡阶段的合成躯干速度，以计算两个系统之间的一致性（皮尔逊相关系数）和相对均方根误差。在步行和过渡阶段，惯性系统和光学系统之间合成躯干速度的一致性都很强（0.67＜≤0.9）。此外，与步行阶段相比，过渡阶段的相对均方根误差更大（所有路径均超过40%）。得出的结论是，从惯性系统中提取的躯干速度在步行期间具有相当的准确性，但在过渡阶段准确性会降低。
