Department of Human Movement Sciences, University Medical Center Groningen, University of Groningen, The Netherlands.
Exercise Science and Neuroscience Unit, Department of Exercise & Health, Paderborn University, Germany.
J Biomech. 2023 Jun;154:111637. doi: 10.1016/j.jbiomech.2023.111637. Epub 2023 May 15.
Inertial measurement units (IMUs) allow for measurements of kinematic movements outside the laboratory, persevering the athlete-environment relationship. To use IMUs in a sport-specific setting, it is necessary to validate sport-specific movements. The aim of this study was to assess the concurrent validity of the Xsens IMU system by comparing it to the Vicon optoelectronic motion system for lower-limb joint angle measurements during jump-landing and change-of-direction tasks. Ten recreational athletes performed four tasks; single-leg hop and landing, running double-leg vertical jump landing, single-leg deceleration and push off, and sidestep cut, while kinematics were recorded by 17 IMUs (Xsens Technologies B.V.) and eight motion capture cameras (Vicon Motion Systems, Ltd). Validity of lower-body joint kinematics was assessed using measures of agreement (cross-correlation: XCORR) and error (root mean square deviation and amplitude difference). Excellent agreement was found in the sagittal plane for all joints and tasks (XCORR > 0.92). Highly variable agreement was found for knee and ankle in transverse and frontal plane. Relatively high error rates were found in all joints. In conclusion, this study shows that the Xsens IMU system provides highly comparable waveforms of sagittal lower-body joint kinematics in sport-specific movements. Caution is advised interpreting frontal and transverse plane kinematics as between-system agreement highly varied.
惯性测量单元（IMU）允许在实验室外测量运动学运动，保持运动员与环境的关系。要在特定运动中使用 IMU，有必要验证特定运动的运动。本研究的目的是通过比较 Xsens IMU 系统与 Vicon 光电运动系统，评估其在跳跃着陆和变向任务中测量下肢关节角度的同时效度。十名休闲运动员完成了四项任务：单腿跳跃和着陆、双腿垂直跳跃着陆、单腿减速和蹬伸、以及侧步切割，同时通过 17 个 IMU（Xsens Technologies B.V.）和 8 个运动捕捉相机（Vicon Motion Systems，Ltd.）记录运动学。使用一致性测量（交叉相关：XCORR）和误差（均方根偏差和幅度差）评估下肢关节运动学的有效性。在所有关节和任务中，矢状面的一致性都非常好（XCORR > 0.92）。在横切和额状面中，膝关节和踝关节的一致性高度可变。在所有关节中都发现了相对较高的误差率。总之，这项研究表明，Xsens IMU 系统在特定运动中提供了高度可比的矢状面下肢关节运动学的波形。在解释系统间的一致性时，应谨慎使用额状面和横切面上的运动学数据，因为一致性高度可变。
