Document Detail


Repeated exercise-induced arterial hypoxemia in a healthy untrained woman.
MedLine Citation:
PMID:  22743052     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A healthy 36-year-old untrained (maximal oxygen consumption (Vo(2max)): 39mL/kg/min) woman completed multiple graded exercise tests on a treadmill. Temperature-corrected arterial blood samples were obtained in addition to esophageal pressure. Significant hypoxemia (-13mmHg arterial oxygen tension decrease) and arterial oxyhemoglobin desaturation (-6% decrease) was observed relative to rest and occurred during submaximal exercise and worsened at maximal intensities. Expiratory flow limitation (28-40% intersection of tidal volume) was present at near-maximal intensities. Relieving mechanical ventilatory constraints with a helium inspirate (79% He: 21% O(2)) partially reversed the hypoxemia. Conversely, increasing chemical ventilatory stimuli, with hypercapnia (3.5% CO(2)), failed to increase ventilation. Maintaining oxyhemoglobin saturation, via a mildly hyperoxic (26% O(2)) inspirate, increased exercise duration (+45sec) and Vo(2max) (+5mL/kg/min). We attribute the hypoxemia to an excessive [Formula: see text] resulting from ventilation-perfusion mismatch and secondarily to mechanical ventilatory constraints. We conclude that a healthy untrained woman can develop EIAH and this remains stable over a period of 6 months.
Authors:
Paolo B Dominelli; Glen E Foster; Giulio S Dominelli; Jordan S Querido; William R Henderson; Michael S Koehle; A William Sheel
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-25
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  -     ISSN:  1878-1519     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Affiliation:
School of Kinesiology, The University of British Columbia, Vancouver, British Columbia, Canada.
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