Whole-body fat oxidation increases more by prior exercise than overnight fasting in elite endurance athletes
| Autor: | Klavs Madsen, Ulrika Andersson Hall, Fredrik Edin, Anders Pedersen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_specialty Magnetic Resonance Spectroscopy fasting Hydrocortisone Physiology Endocrinology Diabetes and Metabolism 030209 endocrinology & metabolism Fatty Acids Nonesterified 03 medical and health sciences 0302 clinical medicine Oxygen Consumption Fat oxidation Physiology (medical) Medicine Humans Insulin Metabolomics Exercise Breakfast Nutrition and Dietetics Cross-Over Studies biology business.industry Athletes maximal fat oxidation capacity endurance athletes Calorimetry Indirect 030229 sport sciences General Medicine Fasting biology.organism_classification Lipid Metabolism metabolomics Bicycling Adipose Tissue Multivariate Analysis Physical therapy Linear Models Physical Endurance Female prior exercise Whole body business |
| Zdroj: | Andersson Hall, U, Edin, F, Pedersen, A & Madsen, K 2016, ' Whole-body fat oxidation increases more by prior exercise than overnight fasting in elite endurance athletes ', Applied Physiology, Nutrition and Metabolism, vol. 41, no. 4, pp. 430-7 . https://doi.org/10.1139/apnm-2015-0452 |
| ISSN: | 1715-5320 |
| DOI: | 10.1139/apnm-2015-0452 |
| Popis: | The purpose of this study was to compare whole-body fat oxidation kinetics after prior exercise with overnight fasting in elite endurance athletes. Thirteen highly trained athletes (9 men and 4 women; maximal oxygen uptake: 66 ± 1 mL·min−1·kg−1) performed 3 identical submaximal incremental tests on a cycle ergometer using a cross-over design. A control test (CON) was performed 3 h after a standardized breakfast, a fasting test (FAST) 12 h after a standardized evening meal, and a postexercise test (EXER) after standardized breakfast, endurance exercise, and 2 h fasting recovery. The test consisted of 3 min each at 30%, 40%, 50%, 60%, 70%, and 80% of maximal oxygen uptake and fat oxidation rates were measured through indirect calorimetry. During CON, maximal fat oxidation rate was 0.51 ± 0.04 g·min−1 compared with 0.69 ± 0.04 g·min−1 in FAST (P < 0.01), and 0.89 ± 0.05 g·min−1 in EXER (P < 0.01). Across all intensities, EXER was significantly higher than FAST and FAST was higher than CON (P < 0.01). Blood insulin levels were lower and free fatty acid and cortisol levels were higher at the start of EXER compared with CON and FAST (P < 0.05). Plasma nuclear magnetic resonance-metabolomics showed similar changes in both EXER and FAST, including increased levels of fatty acids and succinate. In conclusion, prior exercise significantly increases whole-body fat oxidation during submaximal exercise compared with overnight fasting. Already high rates of maximal fat oxidation in elite endurance athletes were increased by approximately 75% after prior exercise and fasting recovery. |
| Databáze: | OpenAIRE |
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