Effect of posture on the single breath oxygen test in normal subjects

Denis Cortese, J. R. Rodarte, K. Rehder, R. E. Hyatt

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The effect of posture on phase III (alveolar nitrogen plateau) and phase IV (closing capacity) of the single breath oxygen test was examined in 10 normal people. In part 1 of the study, subjects inspired and expired in the standing, supine, prone, and right lateral decubitus positions; there was no effect of posture on phase IV but slopes of phase III were higher when subjects were in the standing position and expired in one of the recumbent positions. Phase IV occurred infrequently except in the prone position (6 of 10 subj); slopes of phase III in part 2 were not consistently altered by changing posture. It is difficult to explain the failure of posture to alter phase IV solely on a model requiring a linear gradient of pleural pressure. The slope of phase III appears to depend more on the emptying patterns of small regions with widely varying volume to ventilation ratios than on gravity dependent sequences of emptying. Finally, the data suggest a considerable similarity between the upright and prone positions in terms of lung filling and emptying.

Original languageEnglish (US)
Pages (from-to)474-479
Number of pages6
JournalJournal of Applied Physiology
Volume41
Issue number4
StatePublished - 1976
Externally publishedYes

Fingerprint

Breath Tests
Posture
Oxygen
Prone Position
Gravitation
Ventilation
Nitrogen
Pressure
Lung

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Cortese, D., Rodarte, J. R., Rehder, K., & Hyatt, R. E. (1976). Effect of posture on the single breath oxygen test in normal subjects. Journal of Applied Physiology, 41(4), 474-479.

Effect of posture on the single breath oxygen test in normal subjects. / Cortese, Denis; Rodarte, J. R.; Rehder, K.; Hyatt, R. E.

In: Journal of Applied Physiology, Vol. 41, No. 4, 1976, p. 474-479.

Research output: Contribution to journalArticle

Cortese, D, Rodarte, JR, Rehder, K & Hyatt, RE 1976, 'Effect of posture on the single breath oxygen test in normal subjects', Journal of Applied Physiology, vol. 41, no. 4, pp. 474-479.
Cortese, Denis ; Rodarte, J. R. ; Rehder, K. ; Hyatt, R. E. / Effect of posture on the single breath oxygen test in normal subjects. In: Journal of Applied Physiology. 1976 ; Vol. 41, No. 4. pp. 474-479.
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