Document Detail

Relationship of subjective tolerance of respirator loads to physiologic effects and psychophysical load sensitivity.
MedLine Citation:
PMID:  2668457     Owner:  NLM     Status:  MEDLINE    
The degree to which subjective tolerance of respirator loads is related to physiologic effects and to psychophysical load sensitivity was investigated in this study. Fifty-two normal volunteers walked on a treadmill while breathing through a variety of respirator-type resistance and dead-space loads. Visual analog scales measuring perceived time limit of exercise and discomfort were both related to the ventilatory work imposed by the loads. Respiratory timing was related to discomfort but not to time limit. Psychophysical sensitivity to added resistive loads (LSS) was measured by the magnitude estimation method. Persons with higher objectively measured LSS had greater subjective intolerance induced by respirator use than persons of lower LSS. These findings suggest that subjective respirator tolerance is related to a person's psychophysical characteristics and to the actual physiologic effects. Furthermore, discomfort may be dissociated from actual exercise limitation.
P Harber; S Shimozaki; T Barrett; P Loisides
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of occupational medicine. : official publication of the Industrial Medical Association     Volume:  31     ISSN:  0096-1736     ISO Abbreviation:  J Occup Med     Publication Date:  1989 Aug 
Date Detail:
Created Date:  1989-09-21     Completed Date:  1989-09-21     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7502807     Medline TA:  J Occup Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  681-6     Citation Subset:  IM    
Department of Medicine, University of California, Los Angeles 90024-1736.
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MeSH Terms
Evaluation Studies as Topic
Motor Activity
Occupational Medicine
Protective Devices*
Respiratory Dead Space
Respiratory Protective Devices*

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