Sixteen lean ( BMI < 25 , age 23 3 yr ) and 10 obese ( BMI > 30 , age 26 6 yr ) physically inactive adults were studied during 3 randomized admissions [ control ( C , no exercise ) , moderate-intensity exercise ( M , @ lactate threshold ( LT ) ) and high-intensity exercise ( H , midway between LT and VO2peak ) ( 30 min ) ] .