Fig. 2
From: Contemporary portable oxygen concentrators and diverse breathing behaviours -- a bench comparison
Examples of respiratory effort used for simulated breathing. a Effort profile used for resting awake breathing (dashed, − 7.2cmH2O amplitude, 17/min) and asleep breathing (solid, − 10.3 cmH2O amplitude, 17.6/min). b A sample of efforts used in vigorous breathing sequence, at baseline (thin, −7cmH2O amplitude, 20/min, no expiratory effort), moderate activity (medium thickness, −15cmH2O amplitude, 24/min, 15% expiratory effort), and high exertion (thick, −28cmH2O, 34/min, 40% expiratory effort)