Document Detail


Influence of caffeine, cold and exercise on multiple choice reaction time.
MedLine Citation:
PMID:  11594446     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
RATIONALE: The effects of caffeine on psychomotor performance have been evaluated under resting conditions and in a thermoneutral environment. Our hypothesis was that these effects could be modified by factors enhancing the level of alertness, such as exercise and cold exposure. OBJECTIVE: The purpose of this study was to follow up changes in the multiple choice reaction time (RT) during exercise at room and low ambient temperatures after caffeine or placebo administered in a double blind manner. METHODS: Nine soccer players performed multistage, incremental exercise until volitional exhaustion on a bicycle ergometer at 22 degrees C or 4 degrees C, 1 h after ingestion of coffee with caffeine (CAF) or without it (PL). Immediately before exercise and at the end of each workload, RT and blood lactate (LA) were measured. Oxygen uptake (VO2) and heart rate (HR) were recorded continuously. Blood LA threshold and the workload associated with the shortest RT were determined. RESULTS: During exercise at 22 degrees C, RT was significantly shorter in CAF than in the PL test, while at 4 degrees C there were no differences in RT between CAF and PL trials. Cold exposure did not affect RT either at rest or during exercise. Neither caffeine nor cold exposure influenced the maximal VO2, the maximal HR and LA threshold. CONCLUSION: In the thermoneutral environment, caffeine ingestion improved psychomotor performance during exercise, whilst at low ambient temperature this effect was blunted. These findings suggest that the stimulating action of caffeine depends on the level and source of arousal.
Authors:
B Kruk; J Chmura; K Krzeminski; A W Ziemba; K Nazar; H Pekkarinen; H Kaciuba-Uscilko
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Psychopharmacology     Volume:  157     ISSN:  0033-3158     ISO Abbreviation:  Psychopharmacology (Berl.)     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-10-11     Completed Date:  2002-02-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7608025     Medline TA:  Psychopharmacology (Berl)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  197-201     Citation Subset:  IM    
Affiliation:
Department of Applied Physiology, MRC, Polish Academy of Sciences, Warsaw. kruk@cmdik.pan.pl
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Analysis of Variance
Caffeine / pharmacology*
Central Nervous System Stimulants / pharmacology*
Cold Temperature*
Double-Blind Method
Exercise Test / drug effects
Humans
Male
Physical Exertion / drug effects*,  physiology*
Psychomotor Performance / drug effects,  physiology
Reaction Time / drug effects*,  physiology*
Chemical
Reg. No./Substance:
0/Central Nervous System Stimulants; 58-08-2/Caffeine

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


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