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Carbohydrate supplementation during prolonged cycling exercise spares muscle glycogen but does not affect intramyocellular lipid use
Carbohydrate intake during long cycling saves muscle sugar stores but does not change fat use inside muscle cells
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Abstract
Carbohydrate supplementation during prolonged cycling exercise resulted in a 38 +/- 19% decrease in type I muscle-fiber glycogen utilization compared to a placebo.
- Plasma glucose rates and carbohydrate oxidation were significantly higher with carbohydrate supplementation than with water only.
- Type II muscle-fiber glycogen utilization decreased by 57 +/- 22% during the first hour of exercise with carbohydrate intake.
- Carbohydrate ingestion led to a 34 +/- 12% reduction in plasma free fatty acid oxidation rates during exercise.
- utilization was not affected by carbohydrate supplementation, with similar reductions in lipid content observed in both trials.
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Key numbers
38±19%
Decrease in Type I Muscle Glycogen Use
Comparison of glycogen utilization in the CHO vs CON trial during the first hour.
57±22%
Decrease in Type II Muscle Glycogen Use
Comparison of glycogen utilization in the CHO vs CON trial during the first hour.
76±21%
Reduction in Type I Muscle Fiber Content
Net decline in lipid content in type I fibers in both trials.