Document Detail


Change in the peripheral CO2 chemoreflex from rest to exercise.
MedLine Citation:
PMID:  7649148     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A single-breath CO2 test of peripheral chemosensitivity has recently been described, and elaborated based on model simulations. This study was designed to measure the peripheral CO2 chemoreflex at rest and during heavy exercise to see if carotid chemosensitivity to CO2 increased. Ten healthy, adult males performed an incremental exercise test to determine their ventilatory anaerobic threshold (VAT), and 20 minutes of steady-state exercise at a pre-determined power output above VAT. Arterialized venous blood was obtained during each minute of incremental exercise to verify development of metabolic acidosis. Carotid chemosensitivity was tested repeatedly at rest and in steady-state exercise by the ventilatory response to a single breath of 13% CO2 in air. The peripheral chemoreflex for CO2 for the group of subjects doubled from rest to exercise (mean 0.096 l.s-1.kPa-1) with all subjects showing an increase. We conclude that the gain of the carotid CO2 chemoreflex increases from rest to exercise at work above the VAT.
Authors:
P Pianosi; M C Khoo
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  70     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1995  
Date Detail:
Created Date:  1995-09-28     Completed Date:  1995-09-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  360-6     Citation Subset:  IM    
Affiliation:
Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adult
Anaerobic Threshold / physiology
Blood Gas Analysis
Carbon Dioxide / blood*
Carotid Body / physiology
Chemoreceptor Cells / physiology*
Exercise / physiology*
Humans
Hydrogen-Ion Concentration
Male
Reflex / physiology*
Respiratory Function Tests
Rest / physiology*
Grant Support
ID/Acronym/Agency:
HL-02536/HL/NHLBI NIH HHS; RR-01861/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


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