Journal of Applied Physiology
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J Appl Physiol 64: 1285-1288, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 3 1285-1288, Copyright © 1988 by American Physiological Society

ARTICLES

Head position modifies upper airway resistance in men

G. Liistro, D. Stanescu, G. Dooms, D. Rodenstein and C. Veriter
Cardiopulmonary Laboratory, Cliniques Universitaires St. Luc, Brussels, Belgium.

We measured in healthy volunteers airway resistance (R(aw)), resistance of the respiratory system (Rrs), and supralaryngeal resistance (Rsl) in the following head positions: neutral, extended, and partially and fully flexed. Sagittal magnetic resonance images of the upper airways were recorded in neutral and flexed head positions. We observed significant increases in Raw (P less than 0.01), Rrs (P less than 0.001), and Rsl (P less than 0.001) in the flexed position, with respect to the neutral one, and corresponding decreases of specific airway and specific respiratory conductances. Resistances decreased (although not significantly) when the subjects' heads were extended. A decrease in both diameter and surface area of the hypopharyngeal airways (as shown by magnetic resonance images) with total head flexion was accompanied by significant increases in all measured resistances. Changes in the caliber of hypopharynx appear to be responsible for the increase in resistance during head flexion.


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