Figure 1. Data analysis before and during an airway occlusion. The technique for measurement of inspiratory time (t^I), maximal pressure during inspiratory effort against an occlusion (P^MAX), and the change in pressure with time during the first 0.1 s of occlusion (dP/dt⁰.1) are shown. The time intervals to peak tidal inspiratory (t^PTIF) and expiratory (t^PTEF) flow were calculated from the zero flow crossing to their respective peak flows (1 kPa = 10.2 cmH²O).