Ruggiero Luca, Dewhurst Susan, Bampouras Theodoros M
Department of Medical and Sport Sciences, University of Cumbria, Lancaster, United Kingdom.
J Appl Biomech. 2016 Aug;32(4):415-9. doi: 10.1123/jab.2015-0297. Epub 2016 Mar 8.
Leg stiffness is an important performance determinant in several sporting activities. This study evaluated the criterion-related validity and reliability of 2 field-based leg stiffness devices, Optojump NextR (Optojump) and Myotest ProR (Myotest) in different testing approaches. Thirty-four males performed, on 2 separate sessions, 3 trials of 7 maximal hops, synchronously recorded from a force platform (FP), Optojump and Myotest. Validity (Pearson's correlation coefficient, r; relative mean bias; 95% limits of agreement, 95%LoA) and reliability (coefficient of variation, CV; intraclass correlation coefficient, ICC; standard error of measurement, SEM) were calculated for first attempt, maximal attempt, and average across 3 trials. For all 3 methods, Optojump correlated highly to the FP (range r = .98-.99) with small bias (range 0.91-0.92, 95%LoA 0.86-0.98). Myotest demonstrated high correlation to FP (range r = .81-.86) with larger bias (range 1.92-1.93, 95%LoA 1.63-2.23). Optojump yielded a low CV (range 5.9% to 6.8%), high ICC (range 0.82-0.86), and SEM ranging 1.8-2.1 kN/m. Myotest had a larger CV (range 8.9% to 13.0%), moderate ICC (range 0.64-0.79), and SEM ranging from 6.3 to 8.9 kN/m. The findings present important information for these devices and support the use of a time-efficient single trial to assess leg stiffness in the field.
腿部僵硬度是多项体育活动中一项重要的表现决定因素。本研究评估了两种基于现场的腿部僵硬度测量设备Optojump NextR（Optojump）和Myotest ProR（Myotest）在不同测试方法下与标准相关的效度和信度。34名男性在两个不同的时间段内，进行了3组每组7次最大跳跃测试，同时通过力平台（FP）、Optojump和Myotest进行同步记录。计算了首次尝试、最大尝试以及3次测试的平均值的效度（皮尔逊相关系数，r；相对平均偏差；95%一致性界限，95%LoA）和信度（变异系数，CV；组内相关系数，ICC；测量标准误，SEM）。对于所有3种方法，Optojump与FP的相关性很高（r范围为0.98 - 0.99），偏差较小（范围为0.91 - 0.92，95%LoA为0.86 - 0.98）。Myotest与FP的相关性较高（r范围为0.81 - 0.86），但偏差较大（范围为1.92 - 1.93，95%LoA为1.63 - 2.23）。Optojump的CV较低（范围为5.9%至6.8%），ICC较高（范围为0.82 - 0.86），SEM范围为1.8 - 2.1 kN/m。Myotest的CV较大（范围为8.9%至13.0%），ICC中等（范围为0.64 - 0.79），SEM范围为6.3至8.9 kN/m。这些发现为这些设备提供了重要信息，并支持使用省时的单次测试来评估现场的腿部僵硬度。
