Document Detail

Human breathing pattern responses to loading with increased background impedance.
MedLine Citation:
PMID:  2708199     Owner:  NLM     Status:  MEDLINE    
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.
A Harver; J A Daubenspeck
Related Documents :
21523349 - The exercise programming preferences and activity levels of cancer patients undergoing ...
2318169 - Cardiac and respiratory correlations with unit discharge in epileptic human temporal lobe.
23558389 - Lactate kinetics at the lactate threshold in trained and untrained men.
6485829 - Role of airway resistance in the control of ventilation during exercise.
2384409 - Effect of abdominal compression on maximum transdiaphragmatic pressure.
1185679 - Mean and breath-by-breath pattern of breathing in man during steady-state exercise.
22297829 - The use of thermal infra-red imaging to detect delayed onset muscle soreness.
18550609 - Effects of hyperinflation on the oxygen pulse as a marker of cardiac performance in copd.
12043719 - Short-term physical training improves vasodilatory capacity in cardiac patients.
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    
Department of Physiology, Dartmouth Medical School, Hanover, New Hampshire 03756.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Airway Resistance*
Models, Biological
Reflex / physiology
Tidal Volume
Time Factors
Grant Support

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

Previous Document:  Force deficit of vascularized skeletal muscle grafts in rabbits.
Next Document:  Internal intercostal nerve discharges in the cat: influence of chemical stimuli.