Caffeine intake improves muscular endurance and induces depletion of anaerobic work capacity in the bench press

Aim: To investigate the effects of caffeine (CAF) ingestion on anaerobic work capacity (AWC) and muscular endurance in bench press exercise at predictive intensities equivalent to 20, 25, 30% 1RM. Methods: Thirteen males (age: 23 ± 3 years; body mass 83.5 4.9 kg; height 172.8 5.0 cm 1RM 82 24 kg) had their test evaluated time until failure was performed 20%, 25%, CAF (350mg) or placebo (PLA, cellulose). AWC measured from linear equation: “Force = Critical Force + (AWC x 1/timeout)”. Results: enhanced 20% (PLA 202.6 29.1s; 243.2 20.6s), but there no ergogenic effect 25% 188.8 23.5 s; 195.6 27.1 s), 147.4 15.8 145.4 14.8 s). lower than PLA 6378.0 1214.9 J; 3246.4 1389.7 p 0.03; Effect size 0.88). (N) not different between treatments 29.97 11.54% 3.74 3.69% 1 RM (p=0.47; size= 0.28). Conclusion: Acute intake reduces increases RM, press.