engleski

Caffeinated Gel Ingestion Enhances Jump Performance, Muscle Strength, and Power in Trained Men

We aimed to explore the effects of caffeinated gel ingestion on neuromuscular performance in resistance-trained men. The participants (n = 17 ; mean ± standard deviation (SD): age 23 ± 2 years, height 183 ± 5 cm, body mass 83 ± 11 kg) completed two testing conditions that involved ingesting a caffeinated gel (300 mg of caffeine) or placebo. The testing outcomes included: (1) vertical jump height in the squat jump (SJ) and countermovement jump (CMJ) ; (2) knee extension and flexion peak torque and average power at angular velocities of 60°·s-1 and 180°·s-1 ; (3) barbell velocity in the bench press with loads corresponding to 50%, 75%, and 90% of one-repetition maximum (1RM) ; and (4) peak power output in a test on a rowing ergometer. Compared to the placebo, caffeine improved: (1) SJ (p = 0.039 ; Cohen's d effect size (d) = 0.18 ; +2.9%) and CMJ height (p = 0.011 ; d = 0.18 ; +3.3%) ; (2) peak torque and average power in the knee extensors at both angular velocities (d ranged from 0.21 to 0.37 ; percent change from +3.5% to +6.9%), peak torque (p = 0.034 ; d = 0.24 ; +4.6%), and average power (p = 0.015 ; d = 0.32 ; +6.7%) at 60°·s-1 in the knee flexors ; (3) barbell velocity at 50% 1RM (p = 0.021 ; d = 0.33 ; +3.5%), 75% 1RM (p < 0.001 ; d = 0.42 ; +5.4%), and 90% 1RM (p < 0.001 ; d = 0.59, +12.0%). We conclude that the ingestion of caffeinated gels may acutely improve vertical jump performance, strength, and power in resistance-trained men.

caffeine ; ergogenic aid ; isokinetic testing ; resistance training

nije evidentirano