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Medicine & Science in Sports & Exercise:
B-13M Free Communication/Poster Fat Metabolism

EFFECTS OF DIFFERENT MACRONUTRIENT CONSUMPTION FOLLOWING RESISTANCE EXERCISE ON INSULIN, GLUCOSE, AND TRIACYLGLYCEROL CONCENTRATIONS

Bosher, K J.1; Shannon, K A.1; Luebbers, P E.1; Shannon, R M.1; Gennings, C1; Potteiger, J A. FACSM1

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1Virginia Commonwealth University, Richmond Virginia

(Sponsor: Dennis J. Jacobsen, FACSM)

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PURPOSE

To examine the effect of consumption of different macronutrient content on insulin, glucose, and triacylglycerol concentrations following a resistance exercise session.

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METHODS

Nine young resistance trained males completed 3 exercise sessions of 8 exercises, 1 warm-up set, followed by 3 sets of 10 repetitions (72.7 ± 1.9 % 10RM). 45 min after exercise, subjects randomly consumed one of three treatment meals: high fat (HF, 37%, 18%, and 45% carbohydrate, protein, and fat), high carbohydrate (HC, 79%, 20 %, and 1 % carbohydrate, protein, and fat), or water (CON). HC and HF were equivalent to 40% of resting metabolic rate. Substrate oxidation was determined after meal consumption for 180 min. Blood was collected pre-exercise, pre-meal, and 15, 30, 45, 60, 90, 120, 150 and 180 min post-meal, and analyzed for insulin, glucose, triacylglycerol, and glycerol.

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RESULTS

Insulin concentration (mg/dl) was higher for HC at 15, 30, 45, 60, and 90 min compared to HF and CON. The order of treatments is CON, HC, and HF: 15 min (3.7 ± 1.7, 58.7 ± 49.0, 31.1 ± 20.2); 30 min (3.2 ± 1.4, 66.6 ± 51.5, 28.8 ± 16.6); 45 min (3.3 ± 1.4, 49.7 ± 26.8, 19.9 ± 8.7); 60 min (3.7 ± 2.1, 33.5 ± 13.3, 16.4 ± 8.8); and 90 min (3.0 ± 1.3, 33.7 ± 17.1, 9.0 ± 2.6). Glucose was higher following the HC meal at 15, 30, 45, 60, and 90 min compared to HF and CON. Triacylglycerol was higher following the HF meal at 90, 120, 150, and 180 min compared to the HC and CON meals.

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CONCLUSIONS

After resistance training exercise, meals too high carbohydrate or fat may create an environment that could promote development of diabetes or atherosclerosis. Supported by American Heart Association (#01513742) and VCU-GCRC (MO1 RR00065 NIH).

©2003The American College of Sports Medicine

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