Document Detail


Breathing pattern during exercise in untrained children.
MedLine Citation:
PMID:  2711053     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Breathing pattern during exercise on a cycle ergometer was studied in 18 untrained children aged from 6 to 15 years of age (9 boys, 9 girls). Oxygen uptake, tidal volume, minute ventilation, all normalized for body weight (VO2BW, VT BW, VE BW), respiratory frequency (f), inspiratory (TI) and expiratory (TE) times, ratio TI over total duration of the respiratory cycle (TI/TTOT) and mean inspiratory flow (VT BW/TI) were measured: (1) at rest (W0) and at the highest load (maximal cardiac rate) of an incremental exercise (W1); (2) in steady state conditions, at 50% of W1 (W1/2) and at 2/3 of W1 (W2/3). VO2BW, VT BW, VE BW, TI/TTOT, VT BW/TI increased significantly (P less than 0.01) from W0 to W1. Behaviour of f and TI were different from the latter parameters: f increased and TI decreased significantly from W0 to W1/2 (P less than 0.01) and from W1/2 to W2/3 (P less than 0.01) but remained similar at W2/3 and W1. We observed a relationship between VO2 BW and VT BW/TI, and between VT BW and TI/TTOT at each step of workload. We conclude that untrained children adapt the pattern of breathing during exercise, as at rest, to metabolic demand. However, the increase in f and the decrease in TI are limited at maximal workload.
Authors:
M Boule; C Gaultier; F Girard
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Respiration physiology     Volume:  75     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-05-26     Completed Date:  1989-05-26     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  225-33     Citation Subset:  IM    
Affiliation:
Unité de Physiologie respiratoire de l'enfant, Université Pierre et Marie Curie, Hôpital, Trousseau, Paris France.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adolescent
Aging / physiology
Child
Female
Humans
Male
Physical Exertion*
Respiration*
Spirometry

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