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Relative effects of flow-resistive and pressure-biased respiratory loading.

Authors
Harber-P; Luo-J; Beck-J; Lee-J
Source
J Occup Med 1991 Oct; 33(10):1055-1059
NIOSHTIC No.
00202261
Abstract
The physiologic and subjective effects of pressure biased breathing (PBB) induced by positive pressure respirator simulators were examined. These effects were compared with the effects of dead space and no load. Medical histories of 15 volunteers were acquired and considered along with results derived from testing the subjects in both laboratory and field settings under a variety of respiratory loads. Only two laboratory sessions were summarized in this report. Studies were conducted while the subjects were on exercise bicycles, all performing at the same rate range. Subjects breathed through a mouthpiece and wore a nose clip while determinations of respiratory volumes, respiratory patterns, added work of breathing, and subjective response were made. Experimental periods lasted six minutes; data was collected during the final minute. Visual analog scales were used to determine subjective responses. In opposition to the addition of dead space, PBB decreased inspiration time, increased expiration time and increased ventilatory effort. Subjective discomfort results were similar for both treatments. The authors conclude that PBB (as one would encounter with the use of positive pressure masks designed to ensure an outward net flow in the case of leakage) directly affects resting lung volume and consequently produces significant physiologic and subjective effects.
Keywords
JOCMA7; NIOSH-Publication; NIOSH-Grant; Respirators; Respiratory-rate; Compressed-air-breathing-apparatus; Breathing-atmospheres; Face-masks; Hyperbaric-environments; Humans; Respiratory-equipment
Contact
Medicine University of California School of Medicine Los Angeles, Calif 90024
CODEN
JOCMA7
Publication Date
19911001
Document Type
Journal Article
Funding Amount
654363.00
Funding Type
Grant
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02005
Issue of Publication
10
ISSN
0096-1736
Source Name
Journal of Occupational Medicine
State
CA
Performing Organization
University of California Los Angeles, Los Angeles, California
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