Document Detail

Effects of caffeine ingestion on exercise testing: a meta-analysis.
MedLine Citation:
PMID:  15657469     Owner:  NLM     Status:  MEDLINE    
This study used the meta-analytic approach to examine the effects of caffeine ingestion on exercise testing. Forty double-blind studies with 76 effect sizes (ES) met the inclusion criteria. The type of exercise test was classified as endurance, graded, or short-term. In comparison with placebo, caffeine improved test outcome by 12.3 % (95 % CI, 9.1 to 15.4), which was equivalent to an overall ES of 0.41 (95 % CI, 0.31 to 0.51). Endurance exercise significantly improved test outcome (P < 0.05) more than either graded or short-term exercise. When exercise protocol was examined, time-to-exhaustion (Tlim) protocols had a significantly greater (P < 0.05) ES than either the graded or the non-Tlim protocol(s). The results from this meta-analysis confirm the ergogenic effects of caffeine, particularly for endurance testing that use Tlim protocols.
Mike Doherty; Paul M Smith
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Publication Detail:
Type:  Journal Article; Meta-Analysis    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  14     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-01-19     Completed Date:  2005-06-30     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  626-46     Citation Subset:  IM    
Dept of Sport, Exercise and Biomedical Sciences, University of Luton, Beds LU1 3JU, UK.
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MeSH Terms
Caffeine / administration & dosage*
Confidence Intervals
Dose-Response Relationship, Drug
Double-Blind Method
Exercise / physiology*
Exercise Test
Odds Ratio
Physical Endurance / physiology*
Randomized Controlled Trials as Topic
Reg. No./Substance:

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

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