Fathian Ramin, Khandan Aminreza, Chiu Loren Z F, Rouhani Hossein
Mechanical Engineering Department, University of Alberta, Edmonton, Alberta, Canada.
Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, Alberta, Canada.
Sports Biomech. 2024 Nov;23(11):2390-2407. doi: 10.1080/14763141.2022.2032296. Epub 2022 Feb 4.
The countermovement vertical jump height, flight time, and jump duration are used to assess athletic performance. Force-plate and motion-capture cameras are used to estimate these parameters, yet, their application is limited to dedicated lab environments. Despite the potential of inertial measurement units (IMU) for estimating the jump height, their accuracy has not been validated. This study investigates the accuracy of our proposed method to estimate the jump height using a sacrum-mounted IMU, during countermovement jumping. Eleven individuals performed four jumps each. To obtain the jump height, we transformed the IMU readouts into anatomical planes, and double-integrated the vertical acceleration after correction for zero velocity and vertical displacement. The accuracy of jump height obtained by IMU was compared to force-plate and motion-capture cameras during jumps without arm swing (mean error (standard deviation) of 0.3(2.2) cm and 1.0(3.0) cm, and correlation coefficient of 0.83 and 0.82, respectively) and during jumps with arm swing (-1.1(2.1) cm and 0.5(1.9) cm, and 0.92 and 0.89). The correlation coefficients were high, and the errors were comparable to the difference between the jump height obtained by force-plate and cameras. Therefore, a sacrum-mounted IMU can be recommended for in-field assessment of countermovement jump with and without arm swing.
反向运动垂直跳高度、飞行时间和跳跃持续时间用于评估运动表现。测力板和动作捕捉相机用于估计这些参数，然而，它们的应用仅限于专门的实验室环境。尽管惯性测量单元（IMU）有潜力用于估计跳跃高度，但其准确性尚未得到验证。本研究调查了我们提出的在反向运动跳跃过程中使用安装在骶骨上的IMU估计跳跃高度方法的准确性。11名受试者每人进行4次跳跃。为了获得跳跃高度，我们将IMU读数转换到解剖平面，并在对零速度和垂直位移进行校正后对垂直加速度进行二次积分。在无摆臂跳跃（平均误差（标准差）分别为0.3（2.2）厘米和1.0（3.0）厘米，相关系数分别为0.83和0.82）和有摆臂跳跃（-1.1（2.1）厘米和0.5（1.9）厘米，相关系数分别为0.92和0.89）过程中，将IMU获得的跳跃高度准确性与测力板和动作捕捉相机进行了比较。相关系数很高，误差与测力板和相机获得的跳跃高度差异相当。因此，对于有摆臂和无摆臂的反向运动跳跃的现场评估，推荐使用安装在骶骨上的IMU。
