Document Detail

Effect of high-intensity exercise on the VE-VCO2 relationship.
MedLine Citation:
PMID:  3110120     Owner:  NLM     Status:  MEDLINE    
The intrinsic relationship between ventilation (VE) and carbon dioxide output (VCO2) is described by the modified alveolar ventilation equation VE = VCO2 k/PaCO2(1-VD/VT) where PaCO2 is the partial pressure of CO2 in the arterial blood and VD/VT is the dead space fraction of the tidal volume. Previous investigators have reported that high-intensity exercise uncouples VE from VCO2; however, they did not measure the PaCO2 and VD/VT components of the overall relationship. In an attempt to provide a more complete analysis of the effects of high-intensity exercise on the VE-VCO2 relationship, we undertook an investigation where five subjects volunteered to perform three steady-state tests (SS1, SS2, SS3) at 60 W. One week after SS1 each subject was required to perform repeated 1-min bouts of exercise corresponding to a work rate of approximately 140% of maximal oxygen uptake (VO2max). Two and 24 h later the subjects performed SS2 and SS3, respectively. This exercise intervention caused PaCO2 during SS2 and SS3 to be regulated (P less than 0.01) approximately 4 Torr below the control (SS1) value of 38.8 Torr. Additionally, significant alterations were noted for VCO2 with corresponding values of 1.15 (SS1), 1.10 (SS2), and 1.04 (SS3) l/min. No changes were noted in either VD/VT or VE. In summary, it seems reasonable to suggest that the disproportionate increase in VE with respect to VCO2 noted in earlier work does not reflect an uncoupling. Rather the slope of the VE-VCO2 relationship is increased in a predictable manner as described by the modified alveolar ventilation equation.
V J Caiozzo; J A Davis; D J Berriman; R B Vandagriff; C A Prietto
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  62     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1987 Apr 
Date Detail:
Created Date:  1987-07-24     Completed Date:  1987-07-24     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1460-4     Citation Subset:  IM; S    
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MeSH Terms
Carbon Dioxide*
Exercise Test
Models, Biological
Physical Exertion*
Reg. No./Substance:
124-38-9/Carbon Dioxide

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