Document Detail


Human breathing pattern responses to loading with increased background impedance.
MedLine Citation:
PMID:  2708199     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We determined the influence of the background level of mechanical impedance on the respiratory responses to very small mechanical loads, at or below the threshold for conscious perception. We used a pseudorandom load application technique to estimate the immediate pattern responses from the zeroth lag of the cross correlation between the load application sequence and the respiratory pattern components of tidal volume (VT), inspiratory and expiratory time (TI and TE), and the instantaneous respiratory frequency (f), minute ventilation (VI), and mean inspiratory flow (VT/TI). Elevation of the background resistance served to reduce the TI and TE responses to small perturbations in resistance from those in the control background state, which resulted in generally smaller perturbations of f, VI, and VT/TI. Elevation of the background elastance, however, served to initiate a TI reduction not seen in the control state but did not appreciably affect the rest of the pattern responses to the load perturbations. Thus the neural reflexes involved in breath-by-breath pattern regulation are modulated by the background level of the respiratory impedance, as well as by the type and size of the load perturbation.
Authors:
A Harver; J A Daubenspeck
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  66     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-06-02     Completed Date:  1989-06-02     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:  680-6     Citation Subset:  IM; S    
Affiliation:
Department of Physiology, Dartmouth Medical School, Hanover, New Hampshire 03756.
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MeSH Terms
Descriptor/Qualifier:
Adult
Airway Resistance*
Biomechanics
Elasticity
Female
Humans
Male
Models, Biological
Reflex / physiology
Respiration*
Tidal Volume
Time Factors
Grant Support
ID/Acronym/Agency:
HL-07449/HL/NHLBI NIH HHS; HL-29068/HL/NHLBI NIH HHS

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


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