Jiangsu Collaborative Innovation Center for Sports and Health Project, Nanjing Sport Institute, Nanjing, China.
Key Laboratory of Human Sports Science for Jiangsu Province, Nanjing Sport Institute, Nanjing, China.
PeerJ. 2024 Jul 9;12:e17658. doi: 10.7717/peerj.17658. eCollection 2024.
Vertical jumping is an important evaluation tool to measure muscle strength and power as well as lower limb symmetry. It is of practical importance and value to develop and utilize a portable and low-cost mobile application (APP) to evaluate jumping. The "My Jump 2" app is an iPhone camera-based application for measuring jumping movements, which is applied to the countermovement jump (CMJ) vertical jumps of the lower limbs of athletes in different sports. The validity of this application and previous versions applied to different forms of vertical jump tests has been preliminarily demonstrated in different population, which has an obvious progress in research. Therefore, the reliability and validity of the jump height, time of flight parameters and symmetry of the CMJ vertical jump of athletes in different sports are needed to be verified by more experiments.
The purpose of this study is to verify whether "My Jump 2" can effectively and reliably assess jump height, flight practice and lower limb symmetry in CMJAM (countermovement jump free arm) tests in fencing, swimming and diving athletes.
Seventy-nine fencers, swimmers and divers with training experience participated in this study. They completed a total of three CMJAM vertical jump and lower limb symmetry tests in 1 day, while being assessed by using the "My Jump 2" application and a force platform. The intra-group correlation coefficient (ICC) was used to verify reliability, while the Cronbach's alpha and coefficient of variation (CV%) was used to analyze the stability of the CMJAM vertical jump test over three jumps. The Pearson correlation coefficient was used to verify the strength of the relationship between methods (., concurrent validity), and the Bland-Altman plot was used to represent consistency, meanwhile, the t-test was used to determine the systematic bias between methods.
Compared with the force platform, the cumulative height values of the total number of jumps (r = 0.999; = 0.000), the cumulative time to vacate (r = 0.999; = 0.000) for the CMJAM test obtained by the "My Jump 2" application, the height (ICC = 0.999-1, = 0.000), the time to vacate flight (ICC = 0.999-1, = 0.000), contact time symmetry (ICC = 0.976-0.994, = 0.000), and flight time symmetry (ICC = 0.921-0.982, = 0.000), respectively. Showed high correlation between the results of "my jump 2" app and the force platform.
The "My Jump 2" application is a valid tool to assess CMJAM vertical jump and lower limb symmetry in fencing, swimming and diving athletes with training experience.
垂直跳跃是衡量肌肉力量和功率以及下肢对称性的重要评估工具。开发和利用便携式低成本移动应用程序（APP）来评估跳跃具有实际意义和价值。“My Jump 2”应用程序是一款基于 iPhone 摄像头的应用程序，用于测量跳跃动作，适用于不同运动项目中运动员的反跳（CMJ）垂直跳跃。该应用程序及其之前版本在不同形式的垂直跳跃测试中的有效性已在不同人群中得到初步验证，这在研究中具有明显的进步。因此，需要通过更多的实验来验证不同运动项目中运动员的 CMJ 垂直跳跃的跳跃高度、腾空时间参数和对称性的可靠性和有效性。
本研究旨在验证“ My Jump 2”是否可以有效可靠地评估有训练经验的击剑、游泳和潜水运动员的 CMJAM（无臂反跳）测试中的跳跃高度、腾空时间和下肢对称性。
共有 79 名有训练经验的击剑运动员、游泳运动员和潜水员参加了这项研究。他们在 1 天内总共完成了 3 次 CMJAM 垂直跳跃和下肢对称性测试，同时使用“ My Jump 2”应用程序和测力台进行评估。组内相关系数（ICC）用于验证可靠性，而克朗巴赫的α和变异系数（CV％）用于分析 3 次跳跃中 CMJAM 垂直跳跃测试的稳定性。皮尔逊相关系数用于验证方法之间的关系强度（即，同时效度），而 Bland-Altman 图用于表示一致性，同时，t 检验用于确定方法之间的系统偏差。
与测力台相比，“ My Jump 2”应用程序获得的 CMJAM 测试的总跳跃次数的累积高度值（r = 0.999； = 0.000）、累积腾空时间（r = 0.999； = 0.000）、高度（ICC = 0.999-1， = 0.000）、腾空时间（ICC = 0.999-1， = 0.000）、接触时间对称性（ICC = 0.976-0.994， = 0.000）和腾空时间对称性（ICC = 0.921-0.982， = 0.000）之间存在高度相关性。
“ My Jump 2”应用程序是评估有训练经验的击剑、游泳和潜水运动员 CMJAM 垂直跳跃和下肢对称性的有效工具。
