Imperial College, Institute of Biomedical Engineering, London, United Kingdom.
Int J Sports Med. 2011 Apr;32(4):254-8. doi: 10.1055/s-0030-1270487. Epub 2011 Mar 4.
This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest® [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated ( P≤0.05-0.001) with the force plate measurements ( R=0.59-0.87 and R=0.66-0.97), respectively. The mean PF and PP values were not significantly different between the 2 kinematic systems and the force plate, but the estimates did produce some systematic bias and relatively large random errors, especially with the 20-kg load (PF bias >170 N, PF error >335 N, PP bias >400 W, PP error >878 W). Some proportional bias was also identified. In summary, the estimation of PF and PP by a linear position transducer and accelerometer showed moderate to strong relative validity and equivalent absolute validity, but these estimates are limited by the presence of bias and large random errors.
这项研究检验了两种运动学系统在估计深蹲跳中力和功率时的有效性。12 名经过重量训练的男性在 Kistler 便携式测力板上分别进行了 20kg、40kg、60kg 和 80kg 的单次重复深蹲跳。一个商用线性位置传感器（GYM）和加速度计（Myotest® [MYO]）被连接到杠铃上，以评估向心峰力（PF）和峰功率（PP）。在所有测试的负荷下，GYM 和 MYO 对 PF 和 PP 的估计与测力板测量值呈中度到高度相关（P≤0.05-0.001）（R=0.59-0.87 和 R=0.66-0.97）。两种运动学系统和测力板之间的平均 PF 和 PP 值没有显著差异，但这些估计值确实存在一些系统偏差和相对较大的随机误差，尤其是在 20kg 的负荷下（PF 偏差>170N，PF 误差>335N，PP 偏差>400W，PP 误差>878W）。还确定了一些比例偏差。总之，线性位置传感器和加速度计对 PF 和 PP 的估计具有中度到高度的相对有效性和等效的绝对有效性，但这些估计值受到偏差和较大随机误差的限制。
