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Concentric and eccentric isokinetic knee extension: A reproducibility study using the IsoMed 2000-dynamometer

机译：同心和偏心等速膝关节伸展：使用IsoMed 2000测力计的重现性研究

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The purpose of this study was to determine relative as well as absolute reproducibility for the IsoMed 2000-dynamometer in measuring Peak Torque (PT) during concentric and eccentric maximum knee extension at two angular velocities. Thirty five physically active male subjects (mean age: 23.7 years) with no prior experience of isokinetic exercise were measured on three occasions (T1-T3), separated by 48-72 h. Detection of systematic errors was performed using repeated measures analysis of variance (ANOVA) with Bonferroni post hoc adjustments. Further statistical calculations were done between consecutive pairs of sessions (T1-T2; T2-T3). Intraclass correlation coefficients (ICC 2,1) were calculated to assess relative reproducibility, whereas absolute reproducibility was determined by the standard error of measurement (SEM). A highly significant systematic error was found for the eccentric measurements with values on the first visit being around 5% lower than corresponding values on the second and third visit. ICC values of 0.907-0.955 and 0.968-0.984 with corresponding values of SEM of 7.4-19.1 and 4.5-10.9 Nm were found for T1-T2 and T2-T3, respectively. In conclusion, high reproducibility was shown for the IsoMed 2000-dynamometer in measuring PT during concentric and eccentric knee extension. However, due to a systematic practice-based improvement found for eccentric measurements, we suggest to do a familiarisation session prior the actual testing sessions in practice.
机译：这项研究的目的是确定IsoMed 2000测力计在两个角速度下同心和偏心最大膝盖伸展过程中测量峰值扭矩（PT）时的相对和绝对重现性。在三项场合（T1-T3）中测量了无运动锻炼经验的35名身体活动的男性受试者（平均年龄：23​​.7岁），间隔48-72小时。使用Bonferroni事后调整，使用方差重复测量分析（ANOVA）进行系统错误的检测。在连续的会话对之间（T1-T2; T2-T3）进行了进一步的统计计算。计算类内相关系数（ICC 2,1）来评估相对再现性，而绝对再现性则由测量的标准误差（SEM）确定。对于偏心测量，发现一个非常显着的系统误差，第一次访问的值比第二次和第三次访问的相应值低大约5％。 T1-T2和T2-T3的ICC值分别为0.907-0.955和0.968-0.984，SEM的相应值为7.4-19.1和4.5-10.9 Nm。总之，在同心和偏心膝盖伸展过程中，IsoMed 2000测功机在测量PT时显示出很高的重现性。但是，由于发现了针对偏心测量的基于系统的，基于实践的改进，因此我们建议在实际测试之前先进行一次熟悉会议。

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