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J Appl Physiol 64: 2272-2278, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 6 2272-2278, Copyright © 1988 by American Physiological Society

ARTICLES

Ventilatory and diaphragmatic EMG changes during negative-pressure ventilation in healthy subjects

D. O. Rodenstein, G. Cuttitta and D. C. Stanescu
Cardiopulmonary Laboratory, Cliniques Universitaires St. Luc, Brussels, Belgium.

To evaluate the response of normal subjects to assisted ventilation, we studied 6 naive healthy subjects before and during negative-pressure ventilation (NPV) with "low" (-10 cmH2O) and "high" (-30 cmH2O) pressures in an Emerson tank respirator. Ventilation was measured with an inductive plethysmograph (Respitrace), and diaphragmatic electromyogram (DEMG) was studied with a bipolar esophageal electrode. During NPV a 1:1 phase lock was observed between subjects and iron lung frequency in all subjects. Tidal volume increased in most subjects, more with high than with low pressures (P less than 0.05), whereas DEMG increased, decreased, or showed no change. Postinspiratory inspiratory diaphragmatic activity (PIIA) significantly increased during high-pressure NPV and was accompanied by an increase in tonic DEMG in one-half of the subjects. Voluntary relaxation resulted in a decrease in DEMG and PIIA. We suggest that cortical activity can explain persistency of active breathing during negative-pressure ventilation.


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J.-C. Glerant, V. Jounieaux, V. F. Parreira, M. Dury, G. Aubert, and D. O. Rodenstein
Effects of Intermittent Negative Pressure Ventilation on Effective Ventilation in Normal Awake Subjects*
Chest, July 1, 2002; 122(1): 99 - 107.
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