Int J Sport Nutr Exerc Metab. 2014 Jun 5. [Epub ahead of print]
Ingestion of a Moderately-High Caffeine Dose Before Exercise Increases Post-Exercise Energy Expenditure.
Fernández-Elías VE1, Del Coso J, Hamouti N, Ortega JF, Muñoz G, Muñoz-Guerra J, Mora-Rodríguez R.
Author information
1Exercise Physiology Laboratory, University of Castilla-La Mancha, Toledo, Spain.
Abstract
Caffeine is an ergogenic aid widely used prior to 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 post-exercise responses to pre-exercise 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 hours post-exercise, heart rate, blood pressure, glucose, lactate and fatty acids were analyzed. None of these variables were statistically affected by pre-exercise caffeine ingestion between 0.5 and 4.5 mg · kg-1. However, ingestion of 4.5 mg · kg-1 of caffeine raised post-exercise energy expenditure 15 % above placebo (233 ± 58 vs. 202 ± 49 kcal/3 hours; P < 0.05). 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 < 0.05). Ventilation correlated with tidal volume (r = 0.45; P < 0.05) and energy expenditure (r = 0.72; P < 0.05). In summary, pre-exercise ingestion of ergogenic caffeine doses do not alter post-exercise cardiovascular responses. However, ingestion of 4.5 mg · kg-1 of caffeine raises 3 h post-exercise energy expenditure (i.e., 31 kcal) likely through increased energy cost of ventilation.
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