Document Detail

Effect of high-fat, high-carbohydrate, and high-protein meals on metabolism and performance during endurance cycling.
MedLine Citation:
PMID:  12432176     Owner:  NLM     Status:  MEDLINE    
The effect of pre-exercise meal composition on metabolism and performance in cycling were investigated in a crossover study. Twelve competitive cyclists ingested high-fat, high-carbohydrate, or high-protein meals 90 min before a weekly exercise test. The test consisted of a 1-hour pre-load at 55% peak power, five 10-min incremental loads from 55 to 82% peak power (to measure the peak fat-oxidation rate), and a 50-km time trial that included three 1-km and 4-km sprints. A carbohydrate supplement was ingested throughout the exercise. Relative to the high-protein and high-fat meals, the high-carbohydrate meal halved the peak fat-oxidation rate and reduced the fat oxidation across all workloads by a factor of 0.20 to 0.58 (p =.002-.0001). Reduced fat availability may have accounted for this reduction, as indicated by lower plasma fatty acid, lower glycerol, and higher pre-exercise insulin concentrations relative to the other meals (p =.04-.0001). In contrast, fat oxidation following the high-protein meal was similar to that following the high-fat meal. This similarity was linked to evidence suggesting greater lipolysis and plasma fat availability following high-protein relative to high-carbohydrate meals. Despite these substantial effects on metabolism, meal composition had no clear effect on sprint or 50-km performance.
David S Rowlands; Will G Hopkins
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  12     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-11-14     Completed Date:  2003-01-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  318-35     Citation Subset:  IM    
Department of Exercise Science in the Institute of Food, Nutrition, and Human Health and Massey University, Private Bag 756, Wellington, New Zealand.
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MeSH Terms
Bicycling / physiology*
Blood Glucose / metabolism
Cross-Over Studies
Dietary Carbohydrates / administration & dosage*,  metabolism
Dietary Fats / administration & dosage*,  metabolism
Dietary Proteins / administration & dosage*,  metabolism
Double-Blind Method
Energy Metabolism / physiology*
Exercise Test
Fatty Acids, Nonesterified / blood
Glucagon / metabolism
Glycerol / metabolism
Insulin / metabolism
Physical Endurance / physiology*
Physical Exertion / physiology
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Dietary Fats; 0/Dietary Proteins; 0/Fatty Acids, Nonesterified; 11061-68-0/Insulin; 56-81-5/Glycerol; 9007-92-5/Glucagon

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