Alisson Henrique Marinho1,2,3, Gislaine Cristina-Souza1,4, Pâmela Souza Santos1,3, Ana Carla Santos-Mariano1,3, André Rodacki3, Fernando Roberto De-Oliveira5, Romulo Bertuzzi6, Adriano Eduardo Lima-Silva7. 1. Human Performance Research Group, Federal University of Technology Parana, Pedro Gusso street, 2601, Neoville, Curitiba, Paraná, 81310900, Brazil. 2. Laboratory of Applied Sports Science, Institute of Physical Education and Sports, Federal University of Alagoas, Maceió, Alagoas, Brazil. 3. Department of Physical Education, Federal University of Parana, Curitiba, Parana, Brazil. 4. Nutrition and Exercise Research Group, State University of Minas Gerais (UEMG), Passos, Minas Gerais, Brazil. 5. Department of Physical Education, Federal University of Lavras, Lavras, Minas Gerais, Brazil. 6. Endurance Performance Research Group (GEDAE-USP), University of São Paulo, São Paulo, Brazil. 7. Human Performance Research Group, Federal University of Technology Parana, Pedro Gusso street, 2601, Neoville, Curitiba, Paraná, 81310900, Brazil. aesilva@utfpr.edu.br.
Abstract
PURPOSE: The current study investigated the effect of caffeine on the breathing pattern during a high-intensity whole-body exercise. METHODS: Using a randomized, crossover, counterbalanced, and double-blind design, twelve healthy men ingested either 5 mg.kg-1 of caffeine or cellulose (placebo) one hour before performing a high-intensity whole-body exercise (i.e., work rate corresponding to 80% of the difference between the gas exchange threshold and maximal oxygen uptake) until the limit of tolerance. Ventilatory and metabolic responses were recorded throughout the trial and at task failure. RESULTS: Caffeine ingestion increased time to task failure in relation to the placebo (368.1 ± 49.6 s vs. 328.5 ± 56.6 s, p = 0.005). Caffeine also increased tidal volume and inspiratory time throughout the exercise (p < 0.05). Compared to task failure with placebo, task failure with caffeine intake was marked by higher (p < 0.05) minute ventilation (134.8 ± 16.4 vs. 147.6 ± 18.2 L.min-1), the ventilatory equivalent of oxygen consumption (37.8 ± 4.2 vs. 41.7 ± 5.5 units), and respiratory exchange ratio (1.12 ± 0.10 vs. 1.19 ± 0.11 units). CONCLUSION: In conclusion, ingestion of caffeine alters the breathing pattern by increasing tidal volume and lengthening the inspiratory phase of the respiratory cycle. These findings suggest that caffeine affects the ventilatory system, which may account, in part, for its ergogenic effects during high-intensity whole-body exercises.
PURPOSE: The current study investigated the effect of caffeine on the breathing pattern during a high-intensity whole-body exercise. METHODS: Using a randomized, crossover, counterbalanced, and double-blind design, twelve healthy men ingested either 5 mg.kg-1 of caffeine or cellulose (placebo) one hour before performing a high-intensity whole-body exercise (i.e., work rate corresponding to 80% of the difference between the gas exchange threshold and maximal oxygen uptake) until the limit of tolerance. Ventilatory and metabolic responses were recorded throughout the trial and at task failure. RESULTS: Caffeine ingestion increased time to task failure in relation to the placebo (368.1 ± 49.6 s vs. 328.5 ± 56.6 s, p = 0.005). Caffeine also increased tidal volume and inspiratory time throughout the exercise (p < 0.05). Compared to task failure with placebo, task failure with caffeine intake was marked by higher (p < 0.05) minute ventilation (134.8 ± 16.4 vs. 147.6 ± 18.2 L.min-1), the ventilatory equivalent of oxygen consumption (37.8 ± 4.2 vs. 41.7 ± 5.5 units), and respiratory exchange ratio (1.12 ± 0.10 vs. 1.19 ± 0.11 units). CONCLUSION: In conclusion, ingestion of caffeine alters the breathing pattern by increasing tidal volume and lengthening the inspiratory phase of the respiratory cycle. These findings suggest that caffeine affects the ventilatory system, which may account, in part, for its ergogenic effects during high-intensity whole-body exercises.
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