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Oxidation of ethanol at rest and during prolonged exercise in men.

The purpose of this study was to measure the oxidation of ethanol at rest and during prolonged moderate exercise with use of 13C labeling. Five healthy young males (22.4 +/- 2.7 yr; maximal O2 uptake = 56 +/- 6.6 ml.kg-1.min-1) performed three exercises (68.4 +/- 6.7% maximal O2 uptake; 90 min) on a cycle ergometer with ingestion of 0.4 (trial A) and 0.8 (trial B) g/kg body wt of [13C]ethanol (diluted in 770 +/- 72 ml of water) or water only (trial C). The subjects were also studied during a 90-min rest period after the ingestion of 0.8 g/kg body wt of [13C]ethanol (trial D). At rest, over the 90-min observation period, only 2.1 +/- 0.3 g of the 61.6 +/- 5.7 g of ethanol ingested were oxidized, providing 11.1 +/- 1.9% of the total energy expenditure. Over the 90 min of exercise, the amounts of ethanol oxidized were similar in trials A (9.5 +/- 2.0 g) and B (8.5 +/- 2.5 g). The contribution of ethanol represented 5.2 +/- 1.0% of the total energy expenditure, which is much lower than that previously reported for exogenous carbohydrates (8-18%) or medium-chain free fatty acids (7-14%). The small contribution of ethanol to energy metabolism did not significantly modify endogenous substrate oxidation.