Document Detail

Thoracoabdominal motion during progressive isocapnic hypoxia in conscious man.
MedLine Citation:
PMID:  6737306     Owner:  NLM     Status:  MEDLINE    
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.
K R Chapman; A S Rebuck
Related Documents :
16725906 - A definition of the breeding season of pool dorset ewes.
10848516 - Cyclooxygenase-2 inhibitors constrict the fetal lamb ductus arteriosus both in vitro an...
7991796 - Effect of post-ovulation nutritional status in ewes on early conceptus survival and gro...
7531766 - Previous exposure to bradykinin unmasks an endothelium-dependent relaxation to the conv...
22795046 - Motivational enhancement therapy coupled with cognitive behavioral therapy versus brief...
21859836 - Blood pressure in different gestational trimesters, fetal growth, and the risk of adver...
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    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Abdomen / physiology*
Diaphragm / physiology
Muscles / physiology*
Respiratory Physiological Phenomena*
Ribs / physiology*
Tidal Volume
Reg. No./Substance:

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

Previous Document:  Single cardiac Purkinje cells: general electrophysiology and voltage-clamp analysis of the pace-make...
Next Document:  A developmental study of the relationship between handedness and eyedness as applied to disappearing...