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KMID : 0378019850280090107
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New Medical Journal
1985 Volume.28 No. 9 p.107 ~ p.112
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Effect of Exercise on Glycogen Content in Skeletal Muscle and Liver in Fasted Rats
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Abstract
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In order to study the effect of fasting and exercise on glycogen metabolism, the glycogen content in skeletal muscle and liver, and blood glucose level were determined in rats.
The glycogen content in gastrocnemius, rectus femoris, triceps muscles and liver was determined at rest and after exercise (treadmill running for 30 min., speed: 1 km/hr, slope: 4 degrees) in regularly fed Sprague-Dawley rats and blood glucose level was determined also.
In an attempt to know the effect of fasting and the effect of exercise on fasted rats, Sprague-Dawley rats fasted for 15 hours(6 : 00 p.m.-9 : 00 a.m.) were studied at rest and after exercise (same as fed group) for determination of glycogen content in above mentioned muscles and liver, and blood glucose level.
The outcome of these experiments was as follows.
In comparison of glycogen content in above mentioned muscles, there was no significant difference between fed and fasted group at rest. But glycogen content in the liver and blood glucose level in fasted group were significantly lower than those in fed group.
After treadmill running, the fasted group showed significant decrease of glycogen content in above mentioned skeletal muscles in comparison with the resting level of glycogen content, but fed group showed no significant change.
On the contrary to the change of glycogen content of skeletal muscles after exercise, the glycogen content in the liver and blood glucose showed a significant decrease after exericse in both groups.
From these results, some inferences can be made that during exercise of moderate intensity and early part of fasting period, main energy source is not skeletal muscle glycogen but liver glycogen, and after liver glycogen is depleted in some degree, skeletal muscle glycogen can be used for energy source during exercise.
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KEYWORD
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