Effects of respirator dead space, inspiratory resistance, and expiratory resistance ventilatory loads

Philip Harber, Steven Shimozaki, Thomas Barrett, Peter Losides, Gil Fine

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The effects of respiratorlike inspiratory resistance (IR), expiratory resistance (ER), and dead space (DS) were assessed in a group of 11 normal volunteers during moderate steady‐state (SS) and rapidly incremented (RI) exercise. The physiologic effects of IR were predominant, increasing inspiratory time, duty cycle, and several measures of ventilatory work. Effects of DS appear related to increased minute ventilation and include increasing flow rates and duty cycle and requiring greater ventilatory work; during RI exercise, the DS effect became relatively smaller at higher exercise levels. ER compressed expiratory time. These results characterize the response to IR, ER, and DS loads and suggest that DS may be relatively less physiologically significant than IR.

Original languageEnglish (US)
Pages (from-to)189-198
Number of pages10
JournalAmerican Journal of Industrial Medicine
Volume16
Issue number2
DOIs
StatePublished - 1989

Keywords

  • breathing resistance
  • dead space
  • respirator

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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