When energy balance is maintained, exercise does not induce negative fat balance in lean sedentary, obese sedentary, or lean endurance-trained individuals.

Description

This study sought to determine the impact of exercise on 24-hour fat oxidation and fat balance in lean sedentary, obese sedentary, and lean endurance-trained men and women. Twenty-four-hour energy expenditure and substrate oxidation rates were measured under sedentary (control) and exercise conditions while maintaining energy balance. The data showed that even in endurance-trained individuals, exercise did not increase 24-hour fat oxidation when subjects were studied in energy balance. Therefore, the authors suggest that the state of energy balance is an underappreciated factor when studying the effect of exercise on fat oxidation and probably body fat mass.