Correspondingly, RSI was the most valid metric across all technologies. G-Flight (+1.3–4 cm) and PUSH (+4.1–4.5 cm) consistently overestimate jump height, while PUSH underestimates contact-time (−24 ms). Mo-Cap held the greatest statistical similarity to force-plates, only overestimating contact-time (+12 ms). Dependent variables included jump height, contact-time, and reactive strength index (RSI). Variability was examined via the coefficient of variation, interclass correlation coefficient, and typical error of measure. Systematic bias was determined by limits of agreement using Bland–Altman analysis. Between-device differences were determined using a one-way repeated measures ANOVA. Each participant performed squat jumps, countermovement jumps, and drop jumps on three separate occasions.
Twelve healthy university students (7 males, 5 females) volunteered for this study. For this study, two-dimensional motion capture (Mo-Cap), G-Flight micro-sensor, and PUSH accelerometer technologies were compared to a research-grade force-plate. However, accurate field analysis has not always been readily available or affordable. Vertical jump is a valuable training, testing, and readiness monitoring tool used across a multitude of sport settings.
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