Effects of caffeine (3 mg) on maximal oxygen consumption, plasmatic lactate and reaction time after maximum effort
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2006
- handle: 10670/1.r0pq96
- 1885-3137
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RICYDE. Revista Internacional de Ciencias del Deporte
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Methyltheobromine Trimethyldioxopurine Guaranine Dihydrotrimethylpurinedione Trimethylxanthine Coffeine Trimethyldihydropurinedione TheineCiter ce document
Sandra Bahia Ramos et al., « Effects of caffeine (3 mg) on maximal oxygen consumption, plasmatic lactate and reaction time after maximum effort », RICYDE. Revista Internacional de Ciencias del Deporte, ID : 10670/1.r0pq96
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Résumé
"The stimulants caffeine effects on sport performance have been widely investigated. The Maximal Oxygen Uptake (MOU) has been used inrecent researches which aim to elucidate mechanisms of caffeine during maximal effort. As a physiological pattern to evaluate the effect of caffeine during the effort and after it (recovery), plasmatic lactate is presented in many studies. In this context, the present study aimed to investigate physiological changes: VO2 MAX on an ergometric device (speed and grade on a treadmill); plasmatic lactate (L) and modification of cognitive and motor performance (Reaction Time Test - RTT) produced by caffeine. Five apparently healthy volunteers (26 ± 5 years; 67 ± 12.5 kg) were submitted twice to the following routine: plasmatic lactate at rest (L 0), reaction time test at rest RTT (R), maximum effort test on treadmill, plasmatic lactate concentrations at minute 1 (L 1), 2 (L 2) and 4 (L 3)after effort, and RTT (1). They were given either one placebo capsule (400 mg corn starch) or caffeine (3 mg/kg of body weight). Two-way ANOVA with repetition was used to compare variables at placebo (P) and caffeine (C) moments. The caffeine moment presented non-significant reduction in RRT, non-significant increase in plasmatic lactate and non-significant modification in VO2 MAX, when compared to placebo moment. Thus, one can conclude that 3 mg/kg/bw of caffeine with 12h of abstinence, presented non-significant effects in maximal oxygen uptake, plasmatic lactate and in simple reaction time."