Fig. 4.
Tracings of the parameters that were measured during basal breathing and entrained iron lung ventilation in one individual subject. DI EMG, surface rectified electromyogram overlaying the chest wall (diaphragm); GG EMG, raw intramuscular genioglossus muscle activity; PetCO2, end-tidal CO2 measured at the nares; Pmask, pressure at the mask; Plung, pressure inside the iron lung; Pepi, pressure at the level of the epiglottis; VT, tidal volume; Airflow, flow measured via nasal mask and pneumotachograph.