EFFECTS OF RESISTANCE VS AEROBIC TRAINING ON SUBSTRATE METABOLISM FOLLOWING MEALS OF DIFFERENT MACRONUTRIENT COMPOSITION

Abstract

PURPOSE These preliminary data provide information on the effects of 3 mon of aerobic training (AT) or resistance training (RT) on substrate oxidation in response to high fat (HF) and high carbohydrate (HC) meals. METHODS Overweight previously sedentary males and females were randomized into one of two groups; AT (n=3, age=29(11.5, BMI=33.8(0.7) or RT (n=6, age=24.2(3.4, BMI=28.8(3.7). Subjects were tested at baseline and 3-months which included the measurement of substrate oxidation for 180 min in response to either a HC meal (79% carbohydrate, 20% protein and 1% fat) or a HF meal (37% carbohydrate, 18% protein, and 45% fat). AT performed treadmill exercise at a target heart rate of 75% of maximal cardiorespiratory fitness 4 d/wk for 45 min. RT performed high intensity resistance training at 75% of 1RM 4 d/wk. RESULTS Means(SD for carbohydrate and fat oxidation in response to HF and HC meals are expressed below: CONCLUSION: In response to HF meal, AT decreased CHO oxidation and increased FAT oxidation. AT increased FAT oxidation in response to HC meal. In response to HF meal there were significant group differences in CHO oxidation. No significant differences were found after 3 mon of RT in response to either meal. Training adaptations in muscle appear to affect the substrate oxidation to meals of different macronutrient content. Supported by American Heart Association (#01513742) and VCU-GCRC (MO1 RR00065, NCRR, NIH).Table: No Caption Available