Concurrent Validity of the Inertial Measurement Unit Vmaxpro in Vertical Jump Estimation

The aim of this study was to evaluate if the inertial measurement unit (IMU) Vmaxpro is a valid device estimate vertical jump height (VJH) when compared motion capture system (MoCAP). Thirteen highly trained female volleyball players participated in which consisted three sessions. After familiarization session, two sessions comprised warm-up followed by ten countermovement jumps, resting min between each attempt. Jump measured simultaneously using take-off velocity and MoCAP center-of-mass excursion. Results show significant differences devices (10.52 cm; p < 0.001; ES = 0.9), very strong Spearman’s correlation (rs 0.84: 0.001), weak concordance coefficient (CCC 0.22; ρ 0.861; Cb 0.26). Regression analysis reveals high correlations, systematic error (8.46 cm), nonproportional random (SEE 1.67 cm). Bland–Altman plots (10.6 cm) with 97.3 % data being within LoA. In conclusion, can be considered for estimation VJH, cheaper, portable, manageable alternative MoCAP. However, magnitude discourages its use where indistinguishable from are used unless corresponding specific fitting equation applied.