Document Detail

Oxidation of exogenous carbohydrate during prolonged exercise in fed and fasted conditions.
MedLine Citation:
PMID:  2228353     Owner:  NLM     Status:  MEDLINE    
The oxidation of glucose and fructose ingested during moderate exercise performed on a cycle ergometer (120 min, 52% VO2max) was compared in ten young males fasted (n = 5) or fed (n = 5) before exercise. The subjects ingested randomly 1.33 g/kg body weight (approximately 96 +/- 9 g) of either enriched 13C-glucose (G), 13C-fructose (F), or water only (W); the solutions were evenly distributed over the exercise period. The fasted subjects began the three exercises with a lower blood glucose (P less than or equal to 0.05 for F only) and insulin (P less than or equal to 0.05) levels and a higher free fatty acid (FFA) concentration (P less than or equal to 0.05) than the fed ones. Throughout the exercise period, blood glucose level was maintained in fasted as well as in fed group for G and F ingestions, while it decreased (P less than or equal to 0.05 at the 100th min in fasted subjects) with water ingestion. Insulin level was similar in both fed and fasted conditions with F and W ingestions and lower than G trials for the fed subjects. For the three ingestions, FFA was lower (P less than or equal to 0.05) in the fasted than in the fed group over the exercise period. Over the 2-h period of exercise, a greater (P less than or equal to 0.05) amount of exogenous F was oxidized in the fasted (49 +/- 6 g) than in the fed (36 +/- 5 g) group, which represent 31% and 20% of the total carbohydrate energy supply, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
D Massicotte; F Péronnet; G Brisson; L Boivin; C Hillaire-Marcel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  11     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1990 Aug 
Date Detail:
Created Date:  1990-12-04     Completed Date:  1990-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  253-8     Citation Subset:  IM    
Département de Kinanthropologie, Université du Québec à Montréal, Canada.
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MeSH Terms
Dietary Carbohydrates / metabolism*
Eating / physiology*
Exercise / physiology*
Fasting / physiology*
Fructose / metabolism
Glucose / metabolism
Time Factors
Reg. No./Substance:
0/Dietary Carbohydrates; 30237-26-4/Fructose; 50-99-7/Glucose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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