Ventilatory Response to Passive Head Up Tilt

  • J. M. Serrador
  • R. L. Bondar
  • R. L. Hughson
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 450)

Abstract

Humans have several adaptive mechanisms to deal with the effect of gravity during upright postures. The effect of passive upright tilt (HUT) on respiration has been shown to reduce the end tidal partial pressure of carbon dioxide (PETCO2) and increase the end tidal partial pressure of oxygen (PETO2) (1,4,5,9,15–19). The typical 4 mmHg drop in PETCO2 has been shown to correspond with a decrease in arterial CO2 (PaCO2) of approximately 2 mmHg (1,5). McHenry et al. (17) found that PaCO2 decreased by ~1 mmHg during 30° HUT. Boutellier and coworkers (6) demonstrated that as subjects went from +1 Gz force to +2 and +3, PaCO2 continued to decrease.

Keywords

Ventilatory Response Breathing Frequency Central Chemoreceptor Upright Tilt Accommodation Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • J. M. Serrador
    • 1
  • R. L. Bondar
    • 1
  • R. L. Hughson
    • 2
  1. 1.Cerebral Blood Flow Lab, School of KinesiologyUniversity of Western OntarioLondonCanada
  2. 2.Cardiorespiratory and Vascular Dynamics Lab, Department of KinesiologyUniversity of WaterlooWaterlooCanada

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