Force–Velocity Profiling Using a Low-Cost, Accessible, and More Accurate Jump Height Calculation Method

We aimed to compare the concurrent validity of force–velocity (F–V) profiling using two low-cost and accessible jump height (JH) calculation methods: flight time method (FT) and modified FT (FTM). Forty-two male athletes performed unloaded, moderate-, and high-loaded squat jumps and countermovement jumps on force plates while recorded with a high-speed smartphone camera. JH was calculated using the impulse-momentum method (IM), FT, and FTM, and values were subsequently used to derive F–V profile variables. The FT significantly overestimated some F–V profile variables of the countermovement jump. Conversely, all F–V profile variables calculated using the FTM did not differ significantly from those derived using the IM. Moreover, F–V profile variables derived using the IM were more strongly correlated with those calculated using the FTM than those calculated using the FT. In conclusion, the FTM demonstrates higher concurrent validity for assessing F–V profiles than the FT.