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Abstract
Postprandial hyperglycemia (PPH) is directly associated with cardiovascular disease risk. A single bout of aerobic (AE) or resistance exercise (RE) lowers PPH in healthy adults. No studies have examined the extent to which prior exercise regulates PPH and insulin sensitivity in overweight and obese adults, and whether differences exist between exercise modalities. PURPOSE: To determine the effects of different exercise modalities on PPH and insulin responses to an oral glucose tolerance test (OGTT) in overweight and obese adults. METHODS: In a randomized, cross-over design, 11 overweight and obese adults (21.8 y; BMI = 32.3 kg/m2) completed three separate trials. Seated rest, a single bout of AE, or a single bout of RE preceded an OGTT by 14-17 h. Blood was obtained at 30 min intervals for 180 min following the OGTT. RESULTS: A main effect for time (p<0.001), but no trial (p .0.05) or interaction (p .0.05) effect, was found for plasma glucose and insulin. Plasma glucose and insulin concentrations increased above baseline (p<0.05) through 120 min and 180 min, respectively. CONCLUSION: Acute AE and RE performed the evening prior to an OGTT does not affect PPH or insulin responses in overweight and obese adults.
