Özet:

Objective: The aim of this study was to evaluate the effects of caffeine on total time to exhaustion and other metabolic parameters. Materialsand methods: A double-blind, placebo controlled and randomized experimental design was used in this investigation. In two different sessions, 5 male (25 ± 5 years old) ingested 6mg ofcaffeine/kg in capsules or placebo in a double blinded manner. The subjects were submitted to an incremental test until to exhaustion on a fixed speed of 10% above lactate threshold, variables were collected every 3 minutes until exhaustion. Individual total time, heart rate, rating of perceived exertion and lactate were measured.Results: Our results show increased exhaustion time for caffeine supplementation than placebo (13.2 ± 2.68 min. caffeine vs 9 ± 3 min. placebo, p<0.01), with no other significant changes for lactate, heart rate or perceivedexertion. Conclusion: We concluded that a 6mg/kg caffeine dose is adequate to improve total time to exhaustion without changing other important physiologic parameters of runners.

Anahtar Kelimeler: