Fitzgerald John S, Johnson LuAnn, Tomkinson Grant, Stein Jesse, Roemmich James N
a Human Performance Laboratory, Department of Kinesiology and Public Health Education , University of North Dakota , Grand Forks , ND , USA.
b Grand Forks Human Nutrition Research Center , United States Department of Agriculture , Grand Forks , ND , USA.
J Sports Sci. 2018 May;36(9):963-969. doi: 10.1080/02640414.2017.1346818. Epub 2017 Jun 26.
Mechanography during the vertical jump may enhance screening and determining mechanistic causes underlying physical performance changes. Utility of jump mechanography for evaluation is limited by scant test-retest reliability data on force-time variables. This study examined the test-retest reliability of eight jump execution variables assessed from mechanography. Thirty-two women (mean±SD: age 20.8 ± 1.3 yr) and 16 men (age 22.1 ± 1.9 yr) attended a familiarization session and two testing sessions, all one week apart. Participants performed two variations of the squat jump with squat depth self-selected and controlled using a goniometer to 80º knee flexion. Test-retest reliability was quantified as the systematic error (using effect size between jumps), random error (using coefficients of variation), and test-retest correlations (using intra-class correlation coefficients). Overall, jump execution variables demonstrated acceptable reliability, evidenced by small systematic errors (mean±95%CI: 0.2 ± 0.07), moderate random errors (mean±95%CI: 17.8 ± 3.7%), and very strong test-retest correlations (range: 0.73-0.97). Differences in random errors between controlled and self-selected protocols were negligible (mean±95%CI: 1.3 ± 2.3%). Jump execution variables demonstrated acceptable reliability, with no meaningful differences between the controlled and self-selected jump protocols. To simplify testing, a self-selected jump protocol can be used to assess force-time variables with negligible impact on measurement error.
垂直纵跳过程中的力学记录可能会增强对身体机能变化潜在机制原因的筛查和判定。纵跳力学记录在评估方面的效用受到力-时变量重测信度数据匮乏的限制。本研究检测了通过力学记录评估的八个纵跳执行变量的重测信度。32名女性（平均±标准差：年龄20.8±1.3岁）和16名男性（年龄22.1±1.9岁）参加了一次熟悉环节和两次测试环节，所有环节间隔均为一周。参与者进行了两种深蹲跳变式，深蹲深度由自身选择，并使用角度计控制至膝关节屈曲80°。重测信度通过系统误差（使用各次跳跃间的效应量）、随机误差（使用变异系数）和重测相关性（使用组内相关系数）进行量化。总体而言，纵跳执行变量显示出可接受的信度，表现为较小的系统误差（平均±95%CI：0.2±0.07）、中等的随机误差（平均±95%CI：17.8±3.7%）以及非常强的重测相关性（范围：0.73 - 0.97）。受控方案和自选方案之间随机误差的差异可忽略不计（平均±95%CI：1.3±2.3%）。纵跳执行变量显示出可接受的信度，受控和自选纵跳方案之间无显著差异。为简化测试，可使用自选纵跳方案来评估力-时变量，对测量误差的影响可忽略不计。
