Caffeine increases whole-body fat oxidation during 1 h of cycling at Fatmax
| Autor: | Juan Del Coso, Carlos Ruiz-Moreno, Víctor Pérez-García, Jaime González-García, Verónica Giráldez-Costas, Francisco J. Amaro-Gahete, Jorge Gutiérrez-Hellín |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Arbitrary unit Medicine (miscellaneous) 030209 endocrinology & metabolism Carbohydrate metabolism Placebo 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Endurance training Internal medicine Heart rate medicine 030109 nutrition & dietetics Nutrition and Dietetics business.industry Substrate oxidation Adverse effects Carbohydrate Endurance exercise Endocrinology Blood pressure chemistry Caffeine business |
| Zdroj: | DDFV. Repositorio Institucional de la Universidad Francisco de Vitoria instname DDFV: Repositorio Institucional de la Universidad Francisco de Vitoria Universidad Francisco de Vitoria |
| Popis: | Purpose The ergogenic effect of caffeine on exercise of maximum intensity has been well established. However, there is controversy regarding the effect of caffeine on shifting substrate oxidation at submaximal exercise. The aim of this study was to investigate the effect of acute caffeine ingestion on whole-body substrate oxidation during 1 h of cycling at the intensity that elicits maximal fat oxidation (Fatmax). Methods In a double-blind, randomized, and counterbalanced experiment, 12 healthy participants (VO2max = 50.7 ± 12.1 mL/ kg/min) performed two acute experimental trials after ingesting either caffeine (3 mg/kg) or a placebo (cellulose). The trials consisted of 1 h of continuous cycling at Fatmax. Energy expenditure, fat oxidation rate, and carbohydrate oxidation rate were continuously measured by indirect calorimetry. Results In comparison to the placebo, caffeine increased the amount of fat oxidized during the trial (19.4 ± 7.7 vs 24.7 ± 9.6 g, respectively; P = 0.04) and decreased the amount of carbohydrate oxidized (94.6 ± 30.9 vs 73.8 ± 32.4 g; P = 0.01) and the mean self-perception of fatigue (Borg scale= 11 ± 2 vs 10 ± 2 arbitrary units; P = 0.05). In contrast, caffeine did not modify total energy expenditure (placebo = 543 ± 175; caffeine = 559 ± 170 kcal; P = 0.60) or mean heart rate (125 ± 13 and 127 ± 9 beats/min; P = 0.30) during exercise. Before exercise, caffeine increased systolic and diastolic blood pressure whilst it increased the feelings of nervousness and vigour after exercise (P < 0.05). Conclusion These results suggest that a moderate dose of caffeine (3 mg/kg) increases the amount of fat oxidized during 1 h of cycling at Fatmax. Thus, caffeine might be used as an effective strategy to enhance body fat utilization during submaxi- mal exercise. The occurrence of several side effects should be taken into account when using caffeine to reduce body fat in populations with hypertension or high sensitivity to caffeine. pre-print 332 KB |
| Databáze: | OpenAIRE |
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