Twenty-five sedentary , obese ( BMI > 30 kg/m2 ) males ( 52.8 7.2 years ) ; 12 controls versus 13 T2DM were randomly allocated to four groups that exercised for 30 min , three times per week either at low ( Fat-Max ; 30-40 % VO ( 2max ) ) or moderate ( T ( vent ) ; 55-65 % VO ( 2max ) ) intensity .