Document Detail


The effect of glycemic index on plasma glucose and lactate levels during incremental exercise.
MedLine Citation:
PMID:  10722781     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Consumption of low glycemic index (GI) foods before submaximal endurance exercise may be beneficial to performance. To test whether this may also be true for high intensity exercise, 10 trained cyclists began an incremental exercise test to exhaustion 65 min after consuming equal carbohydrate portions of glucose (HGI), pasta (LGI), and a noncarbohydrate control (PL). Time to fatigue did not differ significantly (p = 0.05) between treatments. Plasma glucose concentration was significantly lower after LGI vs. HGI from 15 to 45 min of rest postprandial. During exercise, plasma glucose concentration was significantly lower after HGI vs. LGI from 200 W until exhaustion. Plasma lactate concentration following HGI was significantly higher than PL from 30 min of rest postprandial through to the end of the 200-W workload. Plasma lactate concentration following LGI was significantly lower than after HGI from 45 min of rest postprandial through to the end of the 100-W workload. At higher exercise intensities, there was no significant difference in plasma lactate levels between treatments. These findings suggest that a high GI carbohydrate meal (1 g/kg body wt) 65 min prior to exercise decreases plasma glucose and increases plasma lactate levels compared to a low GI meal, but not enough to be detrimental to incremental exercise performance.
Authors:
S R Stannard; N W Constantini; J C Miller
Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  10     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-08-04     Completed Date:  2000-08-04     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:  51-61     Citation Subset:  IM; S    
Affiliation:
School of Exercise and Sports Science, University of Sydney, Lidcombe Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Blood Glucose / analysis*
Cereals
Dietary Carbohydrates / administration & dosage*
Digestion
Exercise Test
Fatigue / physiopathology
Follow-Up Studies
Food
Glucose / administration & dosage*
Humans
Hydrogen-Ion Concentration
Lactates / blood*
Male
Physical Endurance / physiology
Physical Exertion / physiology*
Placebos
Pulmonary Gas Exchange / physiology
Rest
Single-Blind Method
Time Factors
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Lactates; 0/Placebos; 50-99-7/Glucose

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


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