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

Philip Harber, John Luo, John Beck, Jason Lee

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The effects of pressure-biased breathing (PBB), which simulates positive pressure respirator use, were studied in IB volunteer subjects during laboratory exercise. PBB was compared with inspiratory resistance: dead space (ID) load and a no-load (N) situation. PBB had adverse subjective effects comparable with those of ID. Physiologically, PBB led to a small decrease in inspiratory time and an increase in expiratory time as well as an increase in the intensity of ventilatory effort as measured by the mean inspiratory flow rate. It is postulated, based on these findings, that PBB has significant effects on the resting lung volume, leading to both physiologic and subjective consequences.

Original languageEnglish (US)
Pages (from-to)1055-1059
Number of pages5
JournalJournal of Occupational Medicine
Issue number10
StatePublished - Oct 1991

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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