Fig. 5. Time course of tidal volume (VT) under the different experimental conditions. Open square = control ventilation on day 0, 7, or 14 (the data were pooled, because they were almost identical); closed circle = overventilation on day 0; closed diamond = overventilation on day 7; closed square = overventilation on day 14. The end-expiratory pressure was always set to −3 cm H2O. Data are mean ± SEM from 6–9 experiments.