Document Detail

Glucose ingestion before and during exercise does not enhance performance of daily repeated endurance exercise.
MedLine Citation:
PMID:  8425514     Owner:  NLM     Status:  MEDLINE    
The effect of glucose (Glc) ingestion before and during daily, repeated, prolonged exercise on metabolism and performance was tested. Seven young, healthy males performed cycling exercise in two series, with 1 month interval. Each exercise series consisted of 1 h/day on 3 successive days. On the 3rd day, exercise was continued until exhaustion. The intensity was 73.4 (7.7)% [mean (SD)] of maximal oxygen uptake (VO2max). Glucose (Glc) or placebo (P) drink was ingested 15 min before the start, and at 15 and 45 min of each daily exercise. The total amount of Glc ingested was 43.1 (4.2) g. During exercise, blood Glc concentrations were significantly higher (P < 0.05) when Glc was ingested than when P was ingested [Glc 5.14 (0.32) and P 4.12 (4.17) mmol.l-1 at exhaustion]. However, Glc ingestion did not improve performance time to exhaustion [Glc 92.05 (29.55) and P 98.07 (27.33) min]. Free fatty acid concentrations were significantly lower when Glc was ingested than when P was ingested [Glc 0.63 (0.21) and P 1.39 (0.46) mmol.l-1 at exhaustion]. There were no significant differences in exercise heart rate, VO2, respiratory exchange ratio, blood lactate concentrations or rating of perceived exertion between the conditions nor were there any significant differences in these parameters on different days of exercise. It seems that ingestion of small amounts of Glc does not increase the metabolism of carbohydrate or improve the performance of intensive endurance exercise of poorly trained subjects, even when the exercise is repeated daily.
I Nishibata; T Sadamoto; Y Mutoh; M Miyashita
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  66     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1993  
Date Detail:
Created Date:  1993-03-01     Completed Date:  1993-03-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  65-9     Citation Subset:  IM    
Laboratory of Exercise Physiology, Biomechanics, and Sports Medicine, Faculty of Education, University of Tokyo, Japan.
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MeSH Terms
Blood Glucose / analysis
Energy Metabolism
Fatty Acids, Nonesterified / blood
Glucose / metabolism,  pharmacology*
Insulin / blood
Lactates / blood
Physical Endurance / drug effects*
Reg. No./Substance:
0/Blood Glucose; 0/Fatty Acids, Nonesterified; 0/Lactates; 11061-68-0/Insulin; 50-99-7/Glucose

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