Applied Biomechanics and Sports Technology Research Group, Department of Physical Education, Sport and Human Movement, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Real Federación Española de Futbol, Las Rozas, 28232 Madrid, Spain.
Sensors (Basel). 2024 May 20;24(10):3256. doi: 10.3390/s24103256.
Since isometric training is gaining popularity, some devices are being developed to test isometric force as an alternative to the more expensive force plates (FPs); thus, the aim of this study was to test the reliability and validity of "GSTRENGTH" for measuring PF in the isometric belt squat exercise. Five subjects performed 24 contractions at three different knee angles (90°, 105° and 120°) on two occasions (120 total cases). Peak force data were measured using FPs and a strain gauge (SG) and analyzed by Pearson's product-moment correlation coefficient, ICCs, Cronbach's alpha, a paired sample -test and Bland-Altman plots. Perfect or almost perfect relationships (r: 0.999-1) were found with an almost perfect or perfect level of agreement (ICCs: 0.992-1; α: 0.998-1). The -test showed significant differences for the raw data but not for the predictions by the equations obtained with the SG values. The Bland-Altman plots, when significant, showed trivial to moderate values for systematic bias in general. In conclusion, "GSTRENGTH" was shown to be a valid alternative to FPs for measuring PF.
由于等长训练越来越受欢迎，一些设备被开发出来，以测试等长力作为更昂贵的力量板（FP）的替代品；因此，本研究的目的是测试“GSTRENGTH”在等长腰带深蹲运动中测量 PF 的可靠性和有效性。5 名受试者在两种情况下（共 120 次）以三种不同的膝关节角度（90°、105°和 120°）进行了 24 次收缩。使用 FP 和应变计（SG）测量峰值力数据，并通过 Pearson 积矩相关系数、ICC、Cronbach's alpha、配对样本 t 检验和 Bland-Altman 图进行分析。与几乎完美的一致性（ICC：0.992-1；α：0.998-1）相关的几乎完美或完美的关系（r：0.999-1）。t 检验显示原始数据存在显著差异，但 SG 值的方程预测结果则无显著差异。Bland-Altman 图在存在显著差异时，通常显示系统偏差的数值为轻微到中度。总之，“GSTRENGTH”被证明是测量 PF 的 FP 的有效替代品。
