Football Training and Biomechanics Laboratory, Italian Football Federation (FIGC), Technical Department, Coverciano (Florence), Italy.
J Strength Cond Res. 2013 Mar;27(3):761-8. doi: 10.1519/JSC.0b013e31825dbcc5.
The aim of this study was to examine the concurrent validity of 2 portable systems for vertical jump (VJ) assessment under field conditions. The VJ flight times assessed using an optical mat (Optojump) and an accelerometer-based (Myotest) system were compared with that of a force platform. The flight times recorded during a countermovement jump (CMJ) were collected from 20 rugby players (n = 86 jumps) concurrently using the 3 tracking systems. Significant bias between the Force platform and either the Optojump (bias = 0.006 ± 0.007; 95% confidence interval [CI] 0.004-0.007 seconds) and Myotest (bias = -0.031 ± 0.021; 95% CI 0.035 to -0.026s; p < 0.0001) occurred. A nearly perfect correlation was found between force platform and Optojump (r = 0.99; 95% CI 0.098-0.99; p < 0.0001). Force platform and Myotest (r = 0.89; 95% CI 0.084-0.93; p < 0.0001) flight times showed very large association. Difference between Optojump and Myotest systems was significant (-0.036 ± 0.021 seconds; 95% CI -0.041 to -0.032; p < 0.0001), which results in Myotest mean flight time being approximately 7.2% longer than the Optojump flight time. The association between Optojump and Myotest was nearly perfect (r = 0.91, 95% CI 0.86-0.94; p < 0.0001). This study showed that the Optojump and Myotest systems possess convergent validity and can be successfully used under field conditions to assess VJ while performing a CMJ. However, caution should be exercised when interpreting data obtained from different portable systems for field measurement.
本研究旨在检验两种便携式垂直跳跃（VJ）评估系统在现场条件下的同时效度。使用光学垫（Optojump）和基于加速度计的系统（Myotest）评估的 VJ 飞行时间与力台的飞行时间进行了比较。在 20 名橄榄球运动员（n = 86 次跳跃）进行的一次反向跳跃（CMJ）中，同时使用 3 种跟踪系统记录了飞行时间。力台与 Optojump （偏差= 0.006 ± 0.007；95%置信区间[CI] 0.004-0.007 秒）和 Myotest （偏差= -0.031 ± 0.021；95%CI 0.035 至-0.026s；p < 0.0001）之间存在显著偏差。力台与 Optojump 之间存在近乎完美的相关性（r = 0.99；95%CI 0.098-0.99；p < 0.0001）。力台与 Myotest （r = 0.89；95%CI 0.084-0.93；p < 0.0001）的飞行时间之间存在很强的关联性。Optojump 和 Myotest 系统之间的差异具有统计学意义（-0.036 ± 0.021 秒；95%CI -0.041 至-0.032；p < 0.0001），这导致 Myotest 的平均飞行时间比 Optojump 的飞行时间长约 7.2%。Optojump 和 Myotest 之间的关联性近乎完美（r = 0.91，95%CI 0.86-0.94；p < 0.0001）。本研究表明，Optojump 和 Myotest 系统具有收敛效度，可在现场条件下成功用于评估 CMJ 时的 VJ。然而，在解释来自不同便携式系统的现场测量数据时应谨慎。
