Caffeine improves performance but not duration of the countermovement jump phases

Background The countermovement jump (CMJ) test is often employed to assess power generated in the lower limbs and has been related performance several sports modalities. objective of this study was effects caffeine supplementation on height, average (AP), peak (PP), maximum velocity (V max ), force production duration eccentric, isometric concentric muscle contraction phases a CMJ. Methods Sixteen resistance-trained men (age: 22.69±2.12 years; height: 1.78±0.06 m; weight: 78.09±10.27 kg) performed CMJ 60 minutes after having taken an oral supplement containing 6 mg·kg-1 or placebo (sucrose). design randomized, double-blind crossover. Results Caffeine ingestion improved height (+3.86%, P=0.02), V (+1.49%, P=0.023), AP (+4.83%, P=0.006), PP (+3.49%, P=0.004). Conclusions Acute leads , without significantly affecting different phases. Therefore, may be as ergogenic aid where associated with sport-specific enhancements.