Document Detail

Effects of abdominal and thoracic breathing on breathing pattern components in normal subjects and in patients with chronic obstructive pulmonary disease.
MedLine Citation:
PMID:  6486557     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to assess the effect of voluntarily controlled breathing maneuvers on breathing pattern components measured noninvasively with the respiratory inductive plethysmograph. In normal subjects, these maneuvers included predominantly thoracic and abdominal patterns with and without visual reinforcement from video-displayed plots of rib cage versus abdominal loops. In patients with chronic obstructive pulmonary disease (COPD), only predominantly abdominal breathing without and with visual feedback was employed; the latter produced greater abdominal contribution to tidal volume. Voluntarily controlled breathing patterns led to increased minute ventilation (VI) in normal subjects because of variable changes of frequency and tidal volume. This increase in ventilation was achieved despite increased asynchronous and paradoxic motion between rib cage and abdominal excursions that would add to the work of breathing. Patients with COPD had heightened baseline respiratory center drive when compared with that in normal subjects, as evidenced by elevation of VI and mean respiratory flow (VT/TI). In contrast to normal subjects, abdominal breathing produced no change in VI and VT/TI for the group as a whole, but 6 of the 9 patients with COPD had decreases compared with natural breathing. This diminution of respiratory drive in some patients with COPD during voluntary abdominal breathing might relate to limitation of ventilatory response by the increased work of breathing caused by pulmonary hyperinflation, elevated airway resistance, and increased asynchronous and paradoxic motion of the rib cage to the abdominal excursions, and/or the mental activity required to perform the breathing maneuver might be inhibitory to respiratory drive.
M A Sackner; H F Gonzalez; G Jenouri; M Rodriguez
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American review of respiratory disease     Volume:  130     ISSN:  0003-0805     ISO Abbreviation:  Am. Rev. Respir. Dis.     Publication Date:  1984 Oct 
Date Detail:
Created Date:  1984-11-19     Completed Date:  1984-11-19     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370523     Medline TA:  Am Rev Respir Dis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  584-7     Citation Subset:  AIM; IM    
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MeSH Terms
Lung Diseases, Obstructive / physiopathology*
Middle Aged
Pulmonary Ventilation
Tidal Volume
Time Factors
Grant Support

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

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