title: Effects of different doses of caffeine on anaerobic exercise in boys.
abstract: This study investigated effects of low (1 mg·kg-1), moderate (3 mg·kg-1) and high (5 mg·kg-1) doses of caffeine on anaerobic performance in boys. Twenty-six 8- to 10-year-old boys participated in a double-blind, crossover, counter-balanced study. Boys received in random order a placebo (PL) or anhydrous caffeine: 1 (CAF-1), 3 (CAF-3), or 5 (CAF-5) mg caffeine·kg-1 body mass in cherry flavored Sprite. Sixty minutes following consumption boys performed a static handgrip test and then a 30-s Wingate test. Maximal grip strength (21.5 ± 4.9 & 21.6 ± 4.7 vs. 20.4 ± 4.0 kg) was significantly higher in CAF-5 & CAF-3 vs PL, respectively. Absolute and relative peak power (287 ± 72 vs 281 ± 69 W & 8.0 ± 0.9 vs 7.8 ± 1.0 W·kg-1) were significantly higher in CAF-3 vs PL, respectively. Mean power (153 ± 48 vs 146 ± 43 W) was significantly higher in CAF-5 vs PL, respectively. Peak Wingate HR was significantly higher (189 ± 8 vs 185 ± 9 beats·min-1) in CAF-5 vs PL, respectively. These findings suggest that in boys CAF-1 did not affect performance. During the Wingate test CAF-3 resulted in higher peak power while CAF-5 increased mean power. The significant increase in peak HR following the Wingate test is likely related to greater mean power generated during CAF-5.
authors: Dept. of Exercise and Sport Sciences, Harding University, Searcy, AR.
authors: Ken
authors: K
authors: Turley
authors: Paola A
authors: PA
authors: Eusse
authors: Myles M
authors: MM
authors: Thomas
authors: Jeremy R
authors: JR
authors: Townsend
authors: Aaron B
authors: AB
authors: Morton
mesh_terms: D015308:Anaerobic Threshold / Q000187:drug effects*; D054874:Athletic Performance / Q000502:physiology; D002110:Caffeine / Q000008:administration & dosage / Q000494:pharmacology*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage / Q000494:pharmacology*; D002648:Child; D018592:Cross-Over Studies; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D018737:Hand Strength; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male
chemical_list: D000697:Central Nervous System Stimulants; D002110:Caffeine