Exercise Type That Faster Reduces Postprandial Glycemia.

Carbohydrate oxidation, glucose and insulin blood concentrations, isotopically measured rate of appearance of endogenous and exogenous glucose will be measured in 4 ocassions. Participants will undergo in a cross-over randomized fashion the following trials: 1. Exercise pedalling during 50 min at 60% of their VO2max followed by an oral glucose tolerance test (OGTT). 2. Exercise pedalling during 50 min in a hot environment (33ºC) at 60% of their VO2max followed by an oral glucose tolerance test (OGTT). 3. Exercise pedalling during 50 min using intervalic bouts averaging 60% of VO2max followed by an oral glucose tolerance test (OGTT). 4. No exercise, followed by an oral glucose tolerance test (OGTT).