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

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% VO2max for 2 h followed by four "all-out" 30-s sprints....

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Bibliographic Details
Published in:Medicine and science in sports and exercise 1997-02, Vol.29 (2), p.220-224
Main Authors: PARKIN, J. A. M, CAREY, M. F, MARTIN, I. K, STOJANOVSKA, L, FEBBRAIO, M. A
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Dietary Carbohydrates - administration & dosage
Eating
Exercise - physiology
Fundamental and applied biological sciences. Psychology
Glycogen - metabolism
Humans
Male
Muscle Fibers, Fast-Twitch - physiology
Muscle Fibers, Slow-Twitch - physiology
Oxygen Consumption
Physical Endurance - physiology
Space life sciences
Striated muscle. Tendons
Time Factors
Vertebrates: osteoarticular system, musculoskeletal system
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Summary: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% VO2max 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 h (IT) or 2-6 h (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 areas 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 carbohydrate is ingested during the recovery period.
ISSN:0195-9131
1530-0315
DOI:10.1097/00005768-199702000-00009