1. Caffeinated Gel Ingestion Enhances Jump Performance, Muscle Strength, and Power in Trained Men
- Author
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Jozo Grgic, Sandro Venier, and Pavle Mikulic
- Subjects
Adult ,Male ,Rowing ,lcsh:TX341-641 ,030209 endocrinology & metabolism ,Athletic Performance ,ergogenic aid ,Bench press ,Article ,03 medical and health sciences ,Vertical jump ,Young Adult ,0302 clinical medicine ,Animal science ,caffeine ,isokinetic testing ,resistance training ,Double-Blind Method ,Squat jump ,Caffeine ,Ingestion ,Humans ,Muscle Strength ,Muscle, Skeletal ,Mathematics ,Nutrition and Dietetics ,Cross-Over Studies ,Knee extensors ,digestive, oral, and skin physiology ,030229 sport sciences ,Muscle strength ,Jump ,lcsh:Nutrition. Foods and food supply ,Gels ,Food Science - Abstract
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&minus, 1 and 180°, 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&rsquo, 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°, 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 <, 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. more...
- Published
- 2019