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Published on: March 15, 2019
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High-CHO diet increases post-exercise oxygen consumption after a supramaximal exercise bout
G A Ferreira1, R Bertuzzi2, F R De-Oliveira3
1Grupo de Pesquisa em Ciências do Esporte, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brasil.
Summary
High carbohydrate availability significantly boosts exercise performance and elevates post-exercise oxygen consumption (EPOC) after intense workouts. This suggests increased energy expenditure during and after exercise when fueled with ample carbohydrates.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Metabolic Responses
Background:
- Carbohydrate availability is crucial for endurance performance.
- The impact of carbohydrate availability on excess post-exercise oxygen consumption (EPOC) after supramaximal exercise is not fully understood.
Purpose of the Study:
- To investigate the effect of pre-exercise carbohydrate (CHO) availability on EPOC following a single supramaximal exercise bout.
- To determine how manipulating CHO stores influences exercise capacity and energy expenditure.
Main Methods:
- Five physically active men completed a supramaximal cycling test (115% V̇O2 peak) to exhaustion.
- Endogenous CHO stores were manipulated via a glycogen-depletion protocol followed by 48 hours of either a low-CHO (10%) or high-CHO (80%) diet.
Main Results:
- High-CHO availability significantly increased time to exhaustion and total oxygen consumption during exercise compared to low-CHO availability.
- A higher EPOC magnitude and greater total oxygen consumption during the exercise and recovery period were observed with high-CHO availability.
- These findings indicate a significant increase in both exercise and post-exercise energy expenditure.
Conclusions:
- Pre-exercise carbohydrate availability plays a significant role in modulating EPOC after supramaximal exercise.
- Optimal carbohydrate intake enhances exercise capacity and augments both immediate and delayed post-exercise metabolic responses.
- These results have implications for optimizing nutrition strategies to maximize training adaptations and energy expenditure.
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