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J Appl Physiol 53: 761-765, 1982;
8750-7587/82 $5.00
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Journal of Applied Physiology, Vol 53, Issue 3 761-765, Copyright © 1982 by American Physiological Society

ARTICLES

Effect of posture on the ventilatory response to CO2

C. Weissman, B. Abraham, J. Askanazi, J. Milic-Emili, A. I. Hyman and J. M. Kinney

The effect of sitting and supine posture on breathing patterns and gas exchange during room air breathing and administration of 2 and 4% CO2 was studied in nine normal subjects using a noninvasive canopy system. During air breathing minute ventilation (VE) was 21% (P less than 0.005) higher in the sitting position. Tidal volume (VT) and mean inspiratory flow (VT/TI) were also greater in the sitting position. With the administration of 4% CO2, VE was 13.9 and 20.0 1/min in the supine and seated position, respectively. The relationship between VE and VT was the same in both cases. For any given level of VE, VT/TI was higher in the seated position. No difference in response to CO2 as measured by delta VE/delta PaCO2 and (delta VT/TI)/delta PaCO2 was observed. However, arterial PCO2 was lower both in the resting and stimulated states when sitting.


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