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- Title
Effects of Glucose or Fructose Feeding on Glycogen Repletion in Muscle and Liver after Exercise or Fasting.
- Authors
Conlee, Robert K.; Lawler, Russell M.; Ross, Patrick E.
- Abstract
In athletics, muscle and liver glycogen content is critical to endurance. This study compared the effectiveness of glucose and fructose feeding on restoring glycogen content after glycogen was decreased by exercise (90-min swim) or fasting (24 h). After 2 h of recovery from either exercise or fasting there was no measurable glycogen repletion in red vastus lateralis muscle in response to fructose. In contrast, glucose feeding induced a similar and significant carbohydrate storage after both depletion treatments (8.44 μmol·g-1 ·2 h-1). In the liver, following 2 h of recovery, the rates of glycogen storage were similar after either glucose or fructose ingestion, but fasting caused a greater rate of repletion (83 μmol·g-1 2 h-1) than exercise (50 μmol·g-1·2 h-1). After 4 h of recovery fructose-fed exercised animals had the highest glycogen concentration (165 μmol·g-1) followed by the glucose-fed exercised group (119 μmol·g-1). These values were 50 and 36%, respectively, of that measured in the normal-fed liver (327 μmol·g-1). In contrast, liver glycogen values in the fasted group decreased between the 2nd and 4th hour of recovery in response to both feeding regimens. From these results we conclude that fructose is a poor nutritional precursor for rapid glycogen restoration in muscle after exercise, but that both glucose and fructose promote rapid accumulation of glycogen in the liver. Copyright © 1987 S. Karger AG, Basel
- Publication
Annals of Nutrition & Metabolism, 1987, Vol 31, Issue 2, p126
- ISSN
0250-6807
- Publication type
Article
- DOI
10.1159/000177259