Whole body fat oxidation increases during exercise. However, 24-h fat oxidation on a day with exercise often remains similar to that of sedentary day, when energy intake is increased to achieve an @entity558 . The present study aimed to examine a possibility that time of the day when exercise is performed makes differences in 24-h fat oxidation. As a potential mechanism of exercise affecting 24-h fat oxidation, its relation to exercise-induced transient @entity51 was examined. Nine young male endurance athletes underwent three trials of indirect calorimetry using a metabolic chamber, in which they performed a session of 100 min of exercise before breakfast (AM), after lunch (PM), or two sessions of 50 min of exercise before breakfast and after lunch (AM/PM) at 65% of maximal @entity26 uptake. Experimental meals were designed to achieve individual energy balance. Twenty-four-hour energy expenditure was similar among the trials, but 24-h fat oxidation was 1,142    97, 809    88, and 608    46 kcal/24 h in descending order of its magnitude for AM, AM/PM, and PM, respectively (P < 0.05). Twenty-four-hour @entity1735 oxidation was 2,558    110, 2,374    114, and 2,062    96 kcal/24 h for PM, AM/PM, and AM, respectively. In spite of @entity558 over 24 h, exercise induced a transient @entity51 , the magnitude of which was negatively correlated with 24-h fat oxidation (r = -0.72, P < 0.01). Similarly, transient @entity1735 deficit after exercise was negatively correlated with 24-h fat oxidation (r = -0.40, P < 0.05). The time of the day when exercise is performed affects 24-h fat oxidation, and the transient energy/ @entity1735 deficit after exercise is implied as a factor affecting 24-h fat oxidation.

Transient XXXX induced by exercise increases 24-h fat oxidation in young trained men.

@entity51 :: ('MESH:D009461', 'Disease') :: ['energy deficit'] @entity558 :: ('MESH:C536528', 'Disease') :: ['energy-balanced condition'] @entity26 :: ('MESH:D010100', 'Chemical') :: ['oxygen'] @entity1735 :: ('CHEBI:16646', 'Chemical') :: ['carbohydrate']
@entity51 :: (MESH:D009461,Disease) :: ['energy deficit']
