Document Detail


Immediate human breathing pattern responses to loads near the perceptual threshold.
MedLine Citation:
PMID:  6629948     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Breathing pattern responses to small mechanical loads added pseudorandomly to the external airway of human subjects were measured using flow-resistive and elastic loads above and below the threshold for detectability of some subjects. The zeroth lag of the computed cross-correlations between the loading sequence and the various aspects of the breathing pattern response was used as an index of the immediate response to loading. All subjects showed an immediate reduction in tidal volume (VT) and expiratory duration (TE) in response to elastic loading, but inspiratory duration (TI) responded variably. Respiratory frequency (f) was increased, and minute ventilation (V) and mean inspiratory flow (VT/TI) decreased immediately in all subjects. Resistance loading, on the other hand, tended to prolong TI and TE immediately such that f fell. VT responses were variable, and both V and VT/TI fell. The responses to imperceptible loads reflect mainly the action of neural reflexes and characteristics intrinsic to the respiratory muscles and configuration of the chest and abdomen. A mathematical simulation was used to show that the TE responses in particular may indicate the action of subconscious neural reflexes.
Authors:
J A Daubenspeck; F M Bennett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  55     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1983 Oct 
Date Detail:
Created Date:  1983-12-20     Completed Date:  1983-12-20     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:  1160-6     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Differential Threshold
Humans
Models, Biological
Perception*
Respiration*
Tidal Volume
Time Factors
Work of Breathing*
Grant Support
ID/Acronym/Agency:
5 S07 RR 05392-18/RR/NCRR NIH HHS; HL-19248/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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