Resumen de Ingestion of a Moderately High Caffeine Dose Before Exercise Increases Postexercise Energy Expenditure
Valentin Emilio Fernandez Elias, Juan del Coso Garrigós, Nassim Hamouti, Juan F. Ortega, Gloria Muñoz, Jesús A. Muñoz-Guerra Revilla, Ricardo Mora Rodríguez
Caffeine is an ergogenic aid widely used before and during prolonged exercise. Due to its prolonged biological half-life caffeine effects could remain after exercise. We aimed to investigate the metabolic, respiratory, and cardiovascular postexercise responses to preexercise graded caffeine ingestion. Twelve aerobically trained subjects (mean VO2max = 54 ± 7 ml · min�1 · kg�1) cycled for 60-min at 75% VO2max after ingesting placebo (0 mg of caffeine per kg of body weight) or 0.5, 1.5, 3.0 and 4.5 mg · kg�1 on five occasions. During the 3 hr postexercise, heart rate, blood pressure, glucose, lactate, and fatty acids were analyzed. None of these variables were statistically affected by preexercise caffeine ingestion between 0.5 and 4.5 mg · kg�1. However, ingestion of 4.5 mg · kg�1 of caffeine raised postexercise energy expenditure 15% above placebo (233 ± 58 vs. 202 ± 49 kcal/3 hr; p < .05). Ventilation and tidal volume were elevated after the 4.5 mg·kg�1 caffeine dose above placebo (9.2 ± 2.5 L · min�1 and 0.67 ± 0.29 L · breath�1 vs. 7.8 ± 1.5 L · min�1 and 0.56 ± 0.20 L · breath�1, respectively; p < .05). Ventilation correlated with tidal volume (r = .45; p < .05) and energy expenditure (r = .72; p < .05). In summary, preexercise ingestion of ergogenic caffeine doses do not alter postexercise cardiovascular responses. However, ingestion of 4.5 mg · kg�1 of caffeine raises
