Why Should Athletes Brake Fast? Influence of Eccentric Velocity on Concentric Performance During Countermovement Jumps at Different Loads

• DOI: 10.1123/ijspp.2023-0273
• Publication Date: 2024-01-18T06:23:43Z
• Authors: Jose L. Hernández...; Rafael Sabido; Manuel Omar-García; Daniel Boullosa
• Keywords: Countermovement; Eccentric training; Stretch shortening cycle

Purpose : The aim of the present study was to analyze effect different eccentric tempos on kinetics and kinematics subsequent concentric performance when performing countermovement jumps against loads. Methods After 1-repetition-maximum assessment 2 familiarization sessions, 13 well-trained participants performed, in randomized order, 12 sets (4 × 3 loads) 4 repetitions loaded countermovement-jump exercise. analyzed were 5 seconds, as fast possible, accelerated (ie, without pause between repetitions), while loads used 30%, 50%, 70% 1-repetition maximum. Several kinetic kinematic variables during both phases recorded by linking a linear position transducer barbell. Results work greater condition despite no changes depth. peak mean propulsive velocities as-fast-as-possible conditions. Correlation analysis showed that, compared with 5-second condition, increased related difference performed last 100 milliseconds phase ( r > .770). Conclusions Contrary current practices, highlights need for jumps, common exercise athletes training evaluation purposes, possible. This allows not only but also improved performance.