Document Detail


Coupling of ventilation and CO2 production during exercise in children.
MedLine Citation:
PMID:  3110725     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine how ventilation (VE) and CO2 production (VCO2) in response to exercise change during the growth process in children and teenagers. Dynamic gas exchange responses were measured in two types of studies: 128 healthy children ranging in age from 6 to 18 yr performed progressive exercise tests ("ramp" type protocol) for measurement of the slope of the relationship between VE and VCO2--delta VE/delta VCO2; and the response characteristics of VE and VCO2 in the transition between rest and exercise were measured in 11 teenagers and 11 younger children. Gas exchange was measured breath by breath. We found a small but significant decrease in delta VE/delta VCO2 with increasing body weight (r = -0.46, p less than 0.05), height, or age (mean slope of 27 in the youngest in 21 in the oldest subjects). The response characteristics of VE and VCO2 (measured as the time constant of the best-fit exponential response) were longer than for VO2 in both younger children and teenagers; but the time constants for VE and VCO2 were each approximately 30% faster in younger children compared to teenagers. In addition, end-tidal PCO2 during exercise was significantly lower in the younger subjects (mean value of 39.6 torr) compared to the teenagers (mean value of 43.5 torr). The results suggest that the process of respiratory control in exercise matures to a small degree during childhood in that PCO2 may be regulated at lower levels in younger children and there may be growth-related differences in the relative amounts of CO2 that can be stored in tissues.
Authors:
D M Cooper; M R Kaplan; L Baumgarten; D Weiler-Ravell; B J Whipp; K Wasserman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pediatric research     Volume:  21     ISSN:  0031-3998     ISO Abbreviation:  Pediatr. Res.     Publication Date:  1987 Jun 
Date Detail:
Created Date:  1987-08-12     Completed Date:  1987-08-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0100714     Medline TA:  Pediatr Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  568-72     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Body Weight
Carbon Dioxide / physiology*
Child
Female
Humans
Kinetics
Male
Oxygen / physiology
Physical Exertion*
Respiration*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

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


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