Faculty of sport, University of Ljubljana, Ljubljana, Slovenia.
PLoS One. 2021 Jul 29;16(7):e0255339. doi: 10.1371/journal.pone.0255339. eCollection 2021.
Wearable sensor systems are a emerging tools for the evaluation of the sport's activity and can be used to quantify the external workload of the athlete. The main goal of this paper was to evaluate the validity and reliability of the "Armbeep inertial measurement unit" (IMU) sensor both in a closed tennis exercise and in open matchplay. Twentyfour junior tennis players performed a baseline drill and played matches, during which they wore a combined accelerometer and gyroscope sensor. Video footage was concomitantly recorded using a digital video camera. The agreement between the measurements was assessed with the intraclass correlation coefficient (ICC) and the standard error of measurement (SEM). A simple linear regression was used to predict the number of shots registered from the video and from the Armbeep IMU sensor's data. The number of total forehand and backhand shots during the drill repetitions showed an excellent test and re-test reproducibility (ICC≥0.90). There was a significant relationship between the Armbeep IMU sensor's number of contacts and the total number of shots (R2 = 0.938) which indicated the excellent reliability of the tested Armbeep IMU sensor for those parameters. Considering the accuracy of the total tennis shots and the small magnitude of error for wrist speed and acceleration, the Armbeep IMU sensor appears to be an appropriate on-court tool that can be used to monitor the hitting load during tennis practice and matches.
可穿戴传感器系统是评估运动活动的新兴工具，可用于量化运动员的外部工作量。本文的主要目的是评估“Armbeep 惯性测量单元”（IMU）传感器在封闭网球练习和开放比赛中的有效性和可靠性。二十四名青少年网球运动员进行了基线训练并参加了比赛，在此期间他们佩戴了加速度计和陀螺仪传感器。同时使用数字摄像机记录视频片段。使用组内相关系数（ICC）和测量标准误差（SEM）评估测量值之间的一致性。使用简单线性回归来预测从视频和 Armbeep IMU 传感器数据中记录的击球次数。在训练重复中，正手和反手总击球数显示出极好的测试和再测试可重复性（ICC≥0.90）。Armbeep IMU 传感器的接触次数与总击球次数之间存在显著关系（R2 = 0.938），这表明经过测试的 Armbeep IMU 传感器在这些参数方面具有极好的可靠性。考虑到总网球击球的准确性和手腕速度和加速度的小误差幅度，Armbeep IMU 传感器似乎是一种合适的场上工具，可用于监测网球练习和比赛中的击球负荷。
