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• W2049818993 abstract "Abstract The stimulants caffeine effects on sport performance have been widely investigated. The Maximal Oxygen Uptake (MOU) has been used in recent 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 12 h of abstinence, presented non-significant effects in maximal oxygen uptake, plasmatic lactate and in simple reaction time. Key words / palabras clave : cafeina | VO2 MAX | lactato plasmatico | tiempo de reaccion | caffeine | plasmatic lactate | reaction time Resumen Los efectos estimulantes de la cafeina en el rendimiento deportivo vienen siendo ampliamente investigados. El Consumo Maximo de Oxigeno (VO2 MAX) ha sido empleado en estudios recientes que buscan elucidar los mecanismos de la cafeina durante el esfuerzo maximo a traves de metodos neurologicos asi como fisiologicos. En este contexto, este estudio tiene el objetivo de analizar las variaciones generadas por la cafeina en respuestas ergoespirometrica (VO2 MAX), plasmatica (Lactato-L) y motora (Test del Tiempo de Reaccion – TTR). Para eso, 5 individuos aaparentemente saludables, todos hombres, (26 ± 5 anos, 67 ± 12,5 kg) se sometieron dos veces a la siguiente rutina: medicion de lactato plasmatico (L0), TTR (0), test de esfuerzo maximo en cinta ergometrica, medicion de lactato (L1), (L2), (L3), y TTR(1). Les fue administrada una capsula de 400 mg de placebo (almidon de maiz) o 3 mg/kg de peso corporal (pc) de cafeina. Fue empleada la ANOVA de dos factores con repeticion para la comparacion de las variables en los momentos C, P. El momento cafeina presento reduccion no significativa en el tiempo de reaccion, en el lactato plasmatico y en VO2 MAX. Asi, se puede concluir que cafeina 3 mg/kg/pc con abstinencia de 12 h. no presenta efectos significativos en el consumo maximo de oxigeno, asi como en la concentracion de lactato plasmatico y en el tiempo de reaccion simple. http://dx.doi.org/10.5232/ricyde2006.00504" @default.
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• W2049818993 date "2006-10-01" @default.
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• W2049818993 title "Effects of caffeine (3 mg) on maximal oxygen consumption, plasmatic lactate and reaction time after maximum effort. (Efectos de la utilización de 3 mg de cafeína sobre los niveles de potencia aeróbica máxima, de lactato plasmático y del tiempo de reacción simple, ambos después de la realización de esfuerzo máximo)." @default.
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• W2049818993 doi "https://doi.org/10.5232/ricyde2006.00504" @default.
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