Document Detail

An isocaloric glucose-fructose beverage's effect on simulated 100-km cycling performance compared with a glucose-only beverage.
MedLine Citation:
PMID:  20479485     Owner:  NLM     Status:  MEDLINE    
A number of recent research studies have demonstrated that providing glucose and fructose together in a beverage consumed during exercise results in significantly higher oxidation rates of exogenous carbohydrate (CHO) than consuming glucose alone. However, there is insufficient evidence to determine whether the increased exogenous CHO oxidation improves endurance performance. The purpose of this study was to determine whether consuming a beverage containing glucose and fructose (GF) would result in improved cycling performance compared with an isocaloric glucose-only beverage (G). Nine male competitive cyclists (32.6 +/- 5.8 years, peak oxygen uptake 61.5 +/- 7.9 ml x kg(-1) x min(-1)) completed a familiarization trial and then 2 simulated 100-km cycling time trials on an electronically braked Lode cycle ergometer separated by 5-7 d. During the randomly ordered experimental trials, participants received 36 g of CHO of either G or GF in 250 ml of water every 15 min. All 9 participants completed the 100-km time trial significantly faster when they received the GF beverage than with G (204.0 +/- 23.7 vs. 220.6 +/- 36.6 min; p = .023). There was no difference at any time point between trials for blood glucose or for blood lactate. Total CHO oxidation increased significantly from rest during exercise but was not statistically significant between the GF and G trials, although there was a trend for CHO oxidation to be higher with GF in the latter stages of the time trial. Consumption of a CHO beverage containing glucose and fructose results in improved 100-km cycling performance compared with an isocaloric glucose-only beverage.
Darren Triplett; J Andrew Doyle; Jeffrey C Rupp; Dan Benardot
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  20     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-05-18     Completed Date:  2010-06-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  122-31     Citation Subset:  IM    
Dept. of Kinesiology and Health, Georgia State University, Atlanta, GA.
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MeSH Terms
Bicycling / physiology*
Blood Glucose / metabolism
Cross-Over Studies
Exercise Test
Fructose / administration & dosage,  pharmacology*
Glucose / administration & dosage,  pharmacology*
Lactates / blood
Oxygen Consumption / drug effects*,  physiology
Physical Endurance / drug effects*,  physiology
Young Adult
Reg. No./Substance:
0/Blood Glucose; 0/Lactates; 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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