Centre for Exercise and Sports Science, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, Australia.
Sports Biomech. 2013 Nov;12(4):403-12. doi: 10.1080/14763141.2013.811284.
This study assessed the validity of a tri-axial accelerometer worn on the upper body to estimate peak forces during running and change-of-direction tasks. Seventeen participants completed four different running and change-of-direction tasks (0 degrees, 45 degrees, 90 degrees, and 180 degrees; five trials per condition). Peak crania-caudal and resultant acceleration was converted to force and compared against peak force plate ground reaction force (GRF) in two formats (raw and smoothed). The resultant smoothed (10 Hz) and crania-caudal raw (except 180 degrees) accelerometer values were not significantly different to resultant and vertical GRF for all running and change-of-direction tasks, respectively. Resultant accelerometer measures showed no to strong significant correlations (r = 0.00-0.76) and moderate to large measurement errors (coefficient of variation [CV] = 11.7-23.9%). Crania-caudal accelerometer measures showed small to moderate correlations (r = -0.26 to 0.39) and moderate to large measurement errors (CV = 15.0-20.6%). Accelerometers, within integrated micro-technology tracking devices and worn on the upper body, can provide a relative measure of peak impact force experienced during running and two change-of-direction tasks (45 degrees and 90 degrees) provided that resultant smoothed values are used.
本研究评估了佩戴在上半身的三轴加速度计在估计跑步和变向任务中的峰值力的有效性。十七名参与者完成了四项不同的跑步和变向任务（0 度、45 度、90 度和 180 度；每种条件下进行五次试验）。将峰值颅尾向和合成加速度转换为力，并以两种格式（原始和平滑）与峰值力板地面反作用力（GRF）进行比较。对于所有跑步和变向任务，合成平滑（10 Hz）和颅尾向原始（180 度除外）加速度计值与合成和垂直 GRF 没有显著差异。加速度计测量值的相关性从无到强（r = 0.00-0.76），测量误差从中等到大（变异系数 [CV] = 11.7-23.9%）。颅尾向加速度计测量值的相关性从小到大（r = -0.26 至 0.39），测量误差从中等到大（CV = 15.0-20.6%）。在集成微技术跟踪设备中佩戴在上半身的加速度计可以提供在跑步和两个变向任务（45 度和 90 度）期间经历的峰值冲击力的相对测量值，前提是使用合成平滑值。
