Effects of caffeine on anaerobic exercise in boys.
The effects of caffeine on anaerobic exercise in young boys was investigated. Twenty-four healthy 8-10 year old boys participated in a randomized double-blind, double-crossover, counter-balanced study. Each subject received the caffeinated drink (CAF--5 mg · kg(-1)) or placebo (PL) twice each on four separate visits. Sixty minutes following ingestion of either CAF or PL boys performed a static hand-grip test and then a Wingate test. Reliability was moderately high for the Wingate test (R = .70-0.95). Hand-grip reliability was higher for CAF (R = .88) than PL (R = .52). Mean power (180 ± 36 vs 173 ± 28 W) was significantly higher (p < .05) in CAF versus PL, respectively. There were no differences in peak power or static hand-grip maximal voluntary contraction with CAF. Further, peak HR (190 ± 10 vs 185 ± 10 beats · min(-1)) was significantly higher in CAF versus PL, respectively. Thus, in this study a moderately high dose of CAF significantly increased the average power during a Wingate test, yet it does not affect peak power or static hand-grip strength.
Human Performance Laboratory, Dept of Exercise and Sport Sciences, Harding University, Searcy, AR, USA.
Kenneth R
KR
Turley
Joey D
JD
Rivas
Jeremey R
JR
Townsend
Aaron B
AB
Morton
Jason W
JW
Kosarek
Mark G
MG
Cullum
D000273:Adipose Tissue; D000704:Analysis of Variance; D002110:Caffeine / Q000494:pharmacology*; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D002648:Child; D018592:Cross-Over Studies; D004311:Double-Blind Method; D016552:Ergometry / Q000295:instrumentation; D005080:Exercise Test; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000187:drug effects*; D008297:Male; D015203:Reproducibility of Results; D013223:Statistics as Topic; D011795:Surveys and Questionnaires
D000697:Central Nervous System Stimulants; D002110:Caffeine