Muscle glycogen storage following prolonged exercise: Effect of timing of ingestion of high glycemic index food

Michael F. Carey, Mark A. Febbraio

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This study examined the effect of delaying the ingestion of carbohydrate on muscle glycogen storage following prolonged exhaustive exercise. Six endurance trained men cycled on two separate occasions at a workload corresponding to 70% V̇O(2max) for 2 h followed by four 'all-out' 30-s sprints. Following exercise, subjects were fed five high glycemic index (HGI) meals over a 24-h period, with the first three being fed either at 0-4 (IT) or 2- 6h (DT) at 2-h intervals. Muscle biopsies were taken immediately after exercise and at 8 and 24 h post-exercise and analyzed for glycogen and glucose-6-phosphate. Blood samples were obtained prior to and at 30, 60, and 90 min after each meal and analyzed for glucose and insulin. No differences were observed in the incremental glucose and insulin area after each meal when IT and DT were compared. In addition, no differences were observed in muscle glycogen or glucose-6-phosphate any time in the two trials. These data indicate that delayed feeding of a HGI meal by 2 h has no effect on the rate of muscle glycogen resynthesis at 8 and 24 h post-exercise, providing that sufficient carbohydrates is ingested during the recovery period.

Original languageEnglish
Pages (from-to)220-224
Number of pages5
JournalMedicine and Science in Sports and Exercise
Issue number2
Publication statusPublished - 1 Feb 1997
Externally publishedYes



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