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

本研究旨在了解从高脂肪(F)日粮到高碳水化合物(C)日粮的短期饮食变化对先前饲喂F日粮的大鼠肌肉和肝脏糖原储存和利用以及脂肪组织脂解的影响。结果表明，与F饲粮相比，由F饲粮切换为C饲粮（CHO负荷）3 d的大鼠在休息和运动后短时期内肌肉和肝脏的糖原储存增加，运动时肝糖原节约。在体外，内脏脂肪组织的脂溶活性不受CHO负荷的影响。此外，短期限制能量或不限制能量的C饲粮在运动时均能节约肝糖原，限制能量的C饲粮只增加了静止时肌肉和肝脏的糖原储存。

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.