Fig. 3

Effect of different pressure support levels on muscular and airway pressure-time products (\({\mathrm{PTP}}_{\mathrm{mus}}\) and \({\mathrm{PTP}}_{\mathrm{aw}}\)), EMG-time products of the diaphragm, intercostal and selected channel (\({\mathrm{ETP}}_{\mathrm{di}}\), \({\mathrm{ETP}}_{\mathrm{interc}}\), \({\mathrm{ETP}}_{\mathrm{sel}}\)), minute ventilation (MV), dynamic intrinsic PEEP (iPEEP) and the sEMG-derived estimate (\({\mathrm{PTP}}_{\mathrm{mus,EMG}}\)). The PTP\(/\hbox {min}\) and ETP\(/\hbox {min}\) values were calculated by aggregating all efforts in each support level and then dividing by the length of the segment. Each point corresponds to one patient and one pressure support level. In \({\mathrm{ETP}}_{\mathrm{interc}}\), three outliers \(>{400}\,{\upmu \hbox {V}\hbox {s}/\hbox {min}}\) from a single patient are not shown within the plotting range. Numerical values (mean ± SD) of the data are reported in Additional file 2