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).

Sandra Bahia Ramos, Paula Fernandes de Aguiar, Ana Cristina Lopes, Glória Barreto, André Valentim Siqueira Rodrigues, Henrique Marcelo Gualberto Pereira, Estélio Henrique Martin Dantas, Francisco Radler de Aquino Neto



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


Los efectos estimulantes de la cafeína en el rendimiento deportivo vienen siendo ampliamente investigados. El Consumo Máximo de Oxígeno (VO2 MAX) ha sido empleado en estudios recientes que buscan elucidar los mecanismos de la cafeína durante el esfuerzo máximo a través de métodos neurológicos así como fisiológicos. En este contexto, este estudio tiene el objetivo de analizar las variaciones generadas por la cafeína en respuestas ergoespirométrica (VO2 MAX), plasmática (Lactato-L) y motora (Test del Tiempo de Reacción – TTR). Para eso, 5 individuos aaparentemente saludables, todos hombres, (26 ± 5 años, 67 ± 12,5 kg) se sometieron dos veces a la siguiente rutina: medición de lactato plasmático (L0), TTR (0), test de esfuerzo máximo en cinta ergométrica, medición de lactato (L1), (L2), (L3), y TTR(1). Les fue administrada una cápsula de 400 mg de placebo (almidón de maíz) o 3 mg/kg de peso corporal (pc) de cafeína. Fue empleada la ANOVA de dos factores con repetición para la comparación de las variables en los momentos C, P. El momento cafeína presentó reducción no significativa en el tiempo de reacción, en el lactato plasmático y en VO2 MAX. Así, se puede concluir que cafeína 3 mg/kg/pc con abstinencia de 12 h. no presenta efectos significativos en el consumo máximo de oxígeno, así como en la concentración de lactato plasmático y en el tiempo de reacción simple.




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Palabras clave/key words

cafeina; VO2 MAX; lactato plasmatico; tiempo de reaccion; caffeine; plasmatic lactate; reaction time

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RICYDE. Revista Internacional de Ciencias del Deporte

Publisher: Ramón Cantó Alcaraz
ISSN:1885-3137 - Periodicidad Trimestral / Quarterly
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