Figure 1.

Inspiratory resistive loading and breathing pattern. Effectof breathing against inspiratory linear resistive loads onrespiratory frequency (RF), tidal volume (VT), minute ventilation(V'E), end-tidal carbon dioxide in the expired gas (${\text{PET}}_{{\text{CO}}_2}$), mean inspiratory flow (VT/TI), duty cycle (TI/TT) and occlusion pressure (Pm_0.1). Each bar corresponds to the mean of the corresponding data, with indication of ± 1 SD. The "*" stands for a significant difference at the 5% threshold.