Diet-induced thermogeneis following meals containing different carbohydrate and fat content

Abstract

PURPOSE: To examine the effects of meals of varying macronutrient content on postprandial metabolism in 12 long-term resistance trained (RT) and 12 long-term untrained (UT) males. METHODS: Subjects completed randomized sessions consisting of consumption of a test meal of high carbohydrate (HC) or high fat (HF) content, and measurement of diet-induced thermogenesis (DIT) and substrate oxidation for 240 min. RESULTS: DIT (kJ) and respiratory exchange ratio (RER) are expressed in the table below.Table: No Caption AvailableValues are mean ± SD. *Significantly different than HF † Significantly different than UT There was no training status effect on DIT in response to either the HC or HF meals. Higher DIT was present in RT following the HC meal compared to HF, which was not found in UT. The data do suggest a strong association between substrate utilized and DIT. Pearson correlational analysis revealed a significant relationship (R = 0.55, p < 0.001) between DIT and RER, signifying that DIT is strongly associated with carbohydrate oxidation. CONCLUSION: Resistance training appears to have no effect on DIT following meals of varying macronutrient content. In addition, carbohydrate oxidation may provide a predominate contribution to DIT. Supported by the National Strength and Conditioning Association and Ross Laboratories.