Original Article : Effects of high - fat and high - carbohydrate diet on glycogen utilization during exercise in rats

Journal of Exercise Nutrition & Biochemistry 2001;5(1):81-90.

Abstract

C
arbohydrate and fat on energy metabolism during exercise are essential nutrient, but a number of opinion is divided from their contents of food. In this point of view, to study how high-fat dietary contents affects glycogen utilization, 32 female Sprague-Dawley rats were treadmill trained for 4wk while consuming two high-fat diet and one high-carbohydrate diet. All animals were fed 79% high-fat diet(n=16, HFAT), 70% high-carbohydrate diet(n=16, HCHO). After the final day of training, one-half of rats in each the three groups were run to exhaustion(E), whereas the remaining rats served as rested controls(R). All animals were trained on a motorized rodent treadmill. The animals ran for 30min/d at 28m/min(0% grade). Biochemical analysis items were glycogen. Body weight were similar among the HFAT and 70 HCHO groups. %Fat was significantly greater in animals that consumed the HFAT group than in those on the HCHO group(p<0.05). Generally liver and muscle glycogen concentration had more in the HFR, on the other hand, had less in HFE compared with the others. The average overall glycogen utilization rate was depressed in muscle and liver after animals were on the HFAT. In summary, the present study has suggested that consumption of a 79% high fat diet duringendurance training can lead to an increase in exercise performance in female rats. Some of the consequences training on a F diet are an increase in body fat deposition and slower utilization of glycogen during exercise. These data indicate that rats exposed to a high-fat diet are capable of prolonging exercise in spite of limited glycogen stores.