Rago Vincenzo, Brito João, Figueiredo Pedro, Carvalho Thiago, Fernandes Tiago, Fonseca Pedro, Rebelo António
Center of Research, Education, Innovation and Intervention in Sports, University of Porto, 4099-002 Porto, Portugal.
Portugal Football School, Portuguese Football Federation, 1495-433 Oeiras, Portugal.
Sports (Basel). 2018 Aug 31;6(3):91. doi: 10.3390/sports6030091.
The aim of this study was to analyze the concurrent validity, test⁻retest reliability, and capacity to detect changes of four different portable devices used to measure a wide range of neuromuscular parameters derived from countermovement jump (CMJ). An accelerometric device (Myotest), a jump mat (Ergojump), an optical device (Optojump), and a smartphone app (MyJump) were simultaneously examined for concurrent validity against gold-standard measures (motion-capture system and a force platform). Twenty-two CMJ-derived variables were collected from 15 healthy male subjects ( = 60 CMJs). Contraction time (CT) and eccentric duration (EccD) measurements obtained from the Myotest were moderately to largely associated with and not different from force platform measurements (r = 0.31 to 0.64, ES = 0.11 to 0.18) and showed moderate test-retest reliability (intraclass correlation coefficient (ICC) = 0.92 to 0.97, coefficient of variation (CV) = 3.8 to 8.0%). Flight time (FT) and jump height (JH) from Ergojump, Optojump, and MyJump showed moderate to strong associations with gold-standard measurements (r = 0.57 to 0.98) and good test⁻retest reliability (ICC = 0.54 to 0.97, CV = 1.8 to 4.2). However, all portable devices underestimated JH (ES = 1.25 to 2.75). Independent of the instrument used, the analyzed CMJ variables showed good capacity to detect changes (standard error of measurement (SEM) < smallest worthwhile change (SWC)), with the exception of rate of force and rate of power development parameters, which showed marginal capacity (SEM > SWC). The Myotest is preferable to measure temporal parameters during ground contact, whereas Ergojump, Optojump, and MyJump devices may be preferable to measure FT and JH, with the Optojump being the most accurate.
本研究的目的是分析四种不同便携式设备用于测量从反向移动跳（CMJ）得出的广泛神经肌肉参数时的同时效度、重测信度以及检测变化的能力。对一个加速度测量设备（Myotest）、一个跳垫（Ergojump）、一个光学设备（Optojump）和一个智能手机应用程序（MyJump）进行了同时效度检测，以对照金标准测量方法（动作捕捉系统和一个力平台）。从15名健康男性受试者中收集了22个源自CMJ的变量（共60次CMJ）。从Myotest获得的收缩时间（CT）和离心持续时间（EccD）测量值与力平台测量值中度至高度相关且无差异（r = 0.31至0.64，效应量（ES） = 0.11至0.18），并显示出中度重测信度（组内相关系数（ICC） = 0.92至0.97，变异系数（CV） = 3.8至8.0%）。来自Ergojump、Optojump和MyJump的飞行时间（FT）和跳跃高度（JH）与金标准测量值显示出中度至高度相关性（r = 0.57至0.98），且重测信度良好（ICC = 0.54至0.97，CV = 1.8至4.2）。然而，所有便携式设备都低估了JH（ES = 1.25至2.75）。无论使用何种仪器，所分析的CMJ变量均显示出良好的检测变化能力（测量标准误（SEM）<最小有意义变化（SWC）），但力发展速率和功率发展速率参数除外，它们显示出边缘能力（SEM > SWC）。Myotest在测量地面接触期间的时间参数方面更可取，而Ergojump、Optojump和MyJump设备在测量FT和JH方面可能更可取，其中Optojump最准确。
