EFFECTS OF SHORT-TERM DIETARY CHANGE FROM HIGH FAT TO HIGH CARBOHYDRATE DIETS ON ENERGY METABOLISM DURING PROLONGED EXERCISE IN UNTRAINED RATS

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This study was conducted to obtain effects of short-term dietary change from a high fat (F) diet to a high carbohydrate (C) diet on glycogen storage and utilization of muscle and liver, and lipolysis in adipose tissue in rats previously fed F diet. The results suggest that compared with the rats fed F diet, the rats who were switched from F diet to C diet (CHO loading) for 3 days enhanced glycogen stores of muscle and liver at rest and shortly after exercise, and that liver glycogen sparing during exercise. In vitro lipolytic activity of visceral adipose tissue was not impaired by CHO loading. In addition, short-term C diet feeding with or without energy restriction resulted in liver glycogen sparing during exercse, and that the C diet feeding with energy restriction only enhanced glycogen stores of muscle and liver at rest.