Department of Nephrology, University Medical Centre, 1000 Ljubljana, Slovenia.
Faculty of Sport, University of Ljubljana, 1000 Ljubljana, Slovenia.
Int J Environ Res Public Health. 2020 May 25;17(10):3708. doi: 10.3390/ijerph17103708.
There is a persistent need in sport science for developing a measuring tool that is affordable, portable, and easy to use. We aimed to examine the concurrent validity and test-retest reliability of the My Jump 2 app compared to a validated OptoJump instrument for measuring jump performance during the squat jump (SJ), countermovement jump (CMJ), and CMJ free arms (CMJAM) in primary school children. A total of 48 participants (11-14 years age), volunteered to participate in this research. The jumps were recorded with a validated OptoJump photoelectric cell system and a concurrent device (iPhone X through My Jump 2 app) at the same time. The participants repeated the testing procedure after two weeks to assess the reliability of the measurements (ICC). Systematic bias between sessions and tools was evaluated using the paired samples -test and Bland and Altman analysis. High test-retest reliability (ICC > 0.89) was observed for all measures' in-between conditions. Very large correlations in the total sample were observed between the My Jump 2 app and OptoJump for SJ (r = 0.97, = 0.001), CMJ (r = 0.97, = 0.001), and CMJAM (r = 0.99, = 0.001). Bland and Altman's plot depicting limits of agreement for the total sample between the OptoJump and My Jump 2 show that the majority of data points are within the 95% CIs. The results of this study suggest that My Jump 2 is a valid, reliable, and useful tool for measuring jump performance in primary school children.
在运动科学领域，人们一直需要开发一种价格实惠、便携且易于使用的测量工具。本研究旨在检验 My Jump 2 应用程序与经过验证的 OptoJump 仪器在测量小学生深蹲跳（SJ）、纵跳（CMJ）和 CMJ 自由臂（CMJAM）时的同步有效性和重测信度。共有 48 名参与者（11-14 岁）自愿参加本研究。使用经过验证的 OptoJump 光电传感器系统和同时使用的设备（iPhone X 通过 My Jump 2 应用程序）记录跳跃。参与者在两周后重复测试程序以评估测量的可靠性（ICC）。使用配对样本 t 检验和 Bland 和 Altman 分析评估了两次测试之间的系统偏差和工具之间的系统偏差。所有中间条件下的测试重测信度均很高（ICC > 0.89）。在整个样本中，My Jump 2 应用程序和 OptoJump 之间的 SJ（r = 0.97， = 0.001）、CMJ（r = 0.97， = 0.001）和 CMJAM（r = 0.99， = 0.001）都观察到了非常大的相关性。Bland 和 Altman 的图显示了总样本中 OptoJump 和 My Jump 2 之间的协议差异限制，大多数数据点都在 95%CI 内。本研究结果表明，My Jump 2 是一种有效、可靠且有用的工具，可用于测量小学生的跳跃表现。
