Journal of Applied Physiology
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J Appl Physiol 63: 121-129, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 1 121-129, Copyright © 1987 by American Physiological Society

ARTICLES

Relation of mouth flow to body surface flow during forced oscillation at the chest

R. J. Gilroy, R. Peslin, C. Duvivier, F. Blum and J. P. Butler

We have investigated the body surface flow/mouth flow transfer function (magnitude ratio and phase difference) in seven healthy male subjects driven at the chest from 4 to 30 Hz. The measurements were performed with a specially designed plethysmograph and analyzer. The subjects were driven with a mechanical oscillator placed on the sternum. After differences in gas temperature and humidity were taken into account, the data were in agreement up to 15 Hz with a simple second-order model including an airway compartment, with a resistance and an inertance, and a shunt compliance representing alveolar gas. At larger frequencies, closer inspection revealed that a third-order model was optimal. We interpret these results as indicating a compartmentalization of gas compliance within the thorax, communicating via a resistive element. Airway inertance did not seem to be distributed.


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W. Tomalak, R. Peslin, and C. Duvivier
Respiratory tissue properties derived from flow transfer function in healthy humans
J Appl Physiol, April 1, 1997; 82(4): 1098 - 1106.
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