Document Detail


Effect of respiratory apparatus on respiration.
MedLine Citation:
PMID:  6469818     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A mouthpiece plus noseclip (MP + NC) is frequently used in performing measurements of breathing patterns. Although the effects the apparatus exerts on breathing patterns have been studied, the mechanism of the changes it causes remains unclear. The current study examines the effects on respiratory patterns of a standard (17-mm-diam) MP + NC during room air (RA) breathing and the administration of 2 and 4% CO2 in normal volunteers and in patients 2-4 days after abdominal operation. When compared with values obtained with a noninvasive canopy system, the MP + NC induced increases in minute ventilation (VE), tidal volume (VT), and mean inspiratory flow (VT/TI), but not frequency (f) or inspiratory duty cycle, during both RA and CO2 administration. The percentage increase in VE, VT, and VT/TI caused by the MP + NC decreased as the concentration of CO2 increased. During RA breathing, the application of noseclip alone resulted in a decrease in f and an increase in VT, but VE and VT/TI were unchanged. The changes were attenuated during the administration of 2 and 4% CO2. Reducing the diameter of the mouthpiece to 9 mm abolished the alterations in breathing pattern observed with the larger (17-mm) diameter MP.
Authors:
C Weissman; J Askanazi; J Milic-Emili; J M Kinney
Related Documents :
14628148 - Ventilatory physiology of the numbat (myrmecobius fasciatus).
931928 - Respiratory load compensation in awake and sleeping dogs.
9931198 - Expiratory flow limitation during exercise in competition cyclists.
3081468 - The effect of hyperinflation, inspiratory hold, and oxygenation on cardiopulmonary stat...
2656548 - Substrate and hormone responses to exercise following a marathon run.
18713758 - Influence of ddd rate response pacing with integrated double sensors on physical effici...
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  57     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1984 Aug 
Date Detail:
Created Date:  1984-10-25     Completed Date:  1984-10-25     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  475-80     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Humans
Middle Aged
Pulmonary Ventilation
Respiration*
Respiratory Function Tests / instrumentation*
Tidal Volume
Time Factors
Grant Support
ID/Acronym/Agency:
HL-23975/HL/NHLBI NIH HHS

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


Previous Document:  Morphological and physiological responses of the lungs of dogs to acute decompression.
Next Document:  Measurement and theory of wheezing breath sounds.