Document Detail


Thoracoabdominal motion during progressive isocapnic hypoxia in conscious man.
MedLine Citation:
PMID:  6737306     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Respiratory frequency and separate rib-cage and abdomen-diaphragm compartmental tidal volume (VT) responses to progressive isocapnic hypoxia to a level of 75% O2 saturation (PO2 approximately 40 torr) were measured in eight healthy subjects in both seated and supine postures. Hypoxia was induced by a rebreathing technique and compartmental contributions to VT were measured by inductive plethysmography. The ventilatory, frequency and spirometric VT responses to hypoxia did not differ significantly between sitting and supine trials. The range of VT responsiveness to hypoxia among sitting individuals (0.71 +/- S.D. = 0.56% VC X % fall in Sa,O2(-1), where VC is vital capacity and Sa,O2 is arterial O2 saturation) was determined by both rib-cage (0.507 +/- S.D. = 0.378% VC X % fall in Sa,O2(-1) ) and abdomen-diaphragm (0.194 +/- S.D. = 0.178% VC X % fall fall in Sa,O2(-1) ) compartments. Among supine individuals the range of VT responsiveness to hypoxia (0.49 +/- S.D. = 0.45% VC X % fall in Sa,O2(-1) was determined equally by both rib-cage (0.27 +/- S.D. = 0.31% VC X % fall in SA,O2(-1) ) and abdomen-diaphragm (0.23 +/- S.D. = 0.29% VC X % fall in Sa,O2(-1) ) compartments. Thus, the VT response to progressive isocapnic hypoxia in conscious man is determined by both rib-cage and abdomen-diaphragm compartments regardless of posture.
Authors:
K R Chapman; A S Rebuck
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of physiology     Volume:  349     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1984 Apr 
Date Detail:
Created Date:  1984-08-15     Completed Date:  1984-08-15     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  73-82     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Abdomen / physiology*
Consciousness
Diaphragm / physiology
Female
Humans
Male
Muscles / physiology*
Oxygen*
Plethysmography
Posture
Respiratory Physiological Phenomena*
Ribs / physiology*
Spirometry
Tidal Volume
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections

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


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