The acute effects of food intake on energy expenditure during cycle ergometry

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Abstract
We have examined the effects of a single meal on oxygen consumption (VOO2) before and during exercise in six normal men. Ingestion of 1,000 or 3,000 kcal for breakfast increased VOO2 (thermic effect) by 10%, but the larger breakfast did not induce a greater effect than the smaller one. During exercise after food ingestion, there was an additional thermic effect which had the same magnitude as the effect of food itself. The thermic effects of exercise and food ingestion were not altered in four subjects who ingested 4,000 extra kcal daily for 30 days or in two subjects who ate a high protein and a low protein diet for 2-week periods.

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