Document Detail

Effect of exercise level on ventilatory adaptation to respirator use.
MedLine Citation:
PMID:  2262825     Owner:  NLM     Status:  MEDLINE    
The effect of exercise on the adaptation to an air-purifying respirator type load (dead space + inspiratory resistance) was studied in a group of 13 volunteers with a rapidly incremental exercise protocol. The difference between loaded and unloaded breathing at each exercise level was determined for each subject for a series of parameters describing the ventilatory work to overcome the respirator load pattern of breathing and metabolic work. Linear regression and t tests determined the average effect of the respirator load and the extent to which this effect was affected by the level of exercise. The inspiratory time and duty cycle were increased by the load, and exercise did not significantly affect the magnitude of this adaptation. High exercise did, however, increase the magnitude of the effect of the respiratory load on ventilatory work. These findings suggest that constraints to respiratory pattern adjustment, which may decrease respirator tolerance, occur at high exercise levels.
P Harber; S Shimozaki; T Barrett; G Fine
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of occupational medicine. : official publication of the Industrial Medical Association     Volume:  32     ISSN:  0096-1736     ISO Abbreviation:  J Occup Med     Publication Date:  1990 Oct 
Date Detail:
Created Date:  1991-02-07     Completed Date:  1991-02-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7502807     Medline TA:  J Occup Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1042-6     Citation Subset:  IM; S    
Department of Medicine, University of California, Los Angeles 90024.
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MeSH Terms
Adaptation, Physiological*
Exercise / physiology*
Inspiratory Reserve Volume
Regression Analysis
Respiratory Dead Space
Respiratory Protective Devices*
Grant Support

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