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J Appl Physiol 71: 546-551, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 2 546-551, Copyright © 1991 by American Physiological Society

ARTICLES

Oronasal partitioning of ventilation during exercise in humans

J. R. Wheatley, T. C. Amis and L. A. Engel
Thoracic Medicine Unit, Westmead Hospital, Sydney, New South Wales, Australia.

The partitioning of oronasal breathing was studied in five normal subjects during progressive exercise. Subjects performed three to five identical runs, each consisting of four 1-min work periods at increments of 50 W. Nasal and oral airflow were measured simultaneously using a partitioned face mask both during and for 4 min after exercise. Total mean flows were the sum of nasal and oral flows. At a total mean inspiratory flow of 2 l/s, the nasal fraction of total flow was 0.36 +/- 0.04 (SE) and decreased by 6 +/- 3% between total flows of 1.5 and 2.5 l/s. Throughout exercise, the nasal fraction of total mean inspiratory flow did not differ from that of total expiratory flow and was similar to that of total mean inspiratory flow during the postexercise period at a corresponding total mean flow (both P greater than 0.02). The results show that oronasal flow partitioning is not directly due to the exercise itself but is related to the level of ventilation and is uninfluenced by the direction of upper airway flow (i.e., inspiratory vs. expiratory). These findings suggest tightly controlled modulation of the relative resistances of the oral and/or nasal pathways.


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