Test-Retest Reliability Of Countermovement Jump Force-Time Metrics In Combat Fighters And Physically Active Men
Countermovement jump, force-time curve, combat fighters, reliability, performance testing.
Although jump height is the most analyzed variable, countermovement vertical jump (CMJ) force-time variables describe aspects of the movement strategy. This study investigates the reliability of force-time metrics in different phases of CMJ in combat fighters and physically active men. Eighteen physically active men and twenty amateur combat fighters were tested on three occasions with performed 4-7 valid CMJs with maximum effort. The tests were performed on a force platform. Reliability was determined using the intraclass correlation coefficient (ICC) and the typical error of measurement expressed as coefficient of variation (CV). We considered as “reliable” those metrics showing effect size < 0.2, ICC ≥ 0.75, and CV ≤ 10%, including their 95% confidence intervals. The braking, propulsive and landing phases demonstrated reliable metrics. For the physically active group, the impulse of landing phase was the only reliable variable, while the maximum and mean force for the braking and propulsive phases, and the impulse for the propulsive phase, proved to be reliable variables for the combat fighters group.