EFFECT OF THE COMBINATION OF VOLUNTARY EXERCISE AND DIETARY PROTEIN LEVELS ON THE DEPOSITION OF GLYCOGEN, LIVER AND SERUM LIPIDS IN MICE

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The effects of voluntary exercise on the growth, glycogen of muscle and lipid contents of the liver and serum of mice fed different levels of dietary protein were investigated. In both the exercise and non-exercise groups, body weight gains were significantly greater in the 20% and 30% protein diet groups than in the 6% and 4% protein diet groups. After 6 weeks of age, it was shown that the amount of voluntary exercise by the 6% and 4% protein diet groups was greater than that by the 20% and 30% protein diet groups. As for hematological status, the raising of hemoglobin levels due to increasing dietary protein levels was further exaggerated by voluntary exercise. Hematocrit values rose with the increase in dietary protein levels. However the effect of exercise on hematocrit values was not clear. Liver glycogen levels, which were elevated with the increase in dietary protein levels, rose further due to exercise, though no changes were observed in muscle glycogen due to dietary protein levels and exercise. The lipid contents of the liver in all groups tended to be lower in exercise groups compared with non-exercise groups and it was observed that the high levels of dietary protein depressed the increase in liver lipids. Liver triglyceride levels of all groups fed the dietary protein levels except for the 20% casein diet group decreased due to voluntary exercise, and liver triglyceride levels were also lowered as dietary protein levels increased. The levels of serum triglyceride of all groups decreased due to voluntary exercise. This phenomenon was most remarkable in rats fed a 6% casein diet. The tendency for serum cholesterol levels to decrease due to increasing dietary levels of protein was further intensified by voluntary exercise. However it was not further influenced by voluntary exercise in the 4% casein diet group.
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EFFECT OF THE COMBINATION OF VOLUNTARY EXERCISE AND DIETARY PROTEIN LEVELS ON THE DEPOSITION OF GLYCOGEN, LIVER AND SERUM LIPIDS IN MICE

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