Potentiation of the thermic effect of insulin by exercise: differences between lean, obese, and noninsulin-dependent diabetic men.
We studied the effects of prior high-intensity cycle exercise (85% VO2 max) on total energy expenditure (EE) and the thermic effect of insulin (TEI) in normal controls and in obese insulin-resistant and noninsulin-dependent diabetic (NIDDM) subjects. Normal controls, but not obese or NIDDM subjects, showed a significant increase (3-7%) in total EE 12-16 h after exercise (p less than 0.05). Prior exercise increased lipid and decreased glucose oxidation in all groups. During low-dose insulin infusion (40 mU X M2 X min), prior exercise potentiated TEI in control and NIDDM subjects (p less than 0.05), whereas obese subjects showed no response. During high-dose insulin infusion (400 mU X M2 X min), TEI was similar in NIDDM and control subjects but was significantly less in the obese group. In this study, we found a positive correlation between TEI and insulin-stimulated rates of glucose disposal (r = 0.91, p less than 0.001). The predicted cost of glucose storage accounted for 42% of TEI.
D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D002153:Calorimetry, Indirect; D002245:Carbon Dioxide / Q000378:metabolism; D003924:Diabetes Mellitus, Type 2 / Q000503:physiopathology*; D004734:Energy Metabolism / Q000187:drug effects; D005947:Glucose / Q000378:metabolism; D006801:Humans; D007328:Insulin / Q000097:blood* / Q000494:pharmacology; D008297:Male; D009765:Obesity / Q000503:physiopathology*; D010101:Oxygen Consumption; D005082:Physical Exertion
D001786:Blood Glucose; D007328:Insulin; D002245:Carbon Dioxide; D005947:Glucose