Demographic data, lung function parameters and mouth occlusion pressures
| Subjects n | 20 |
| Sex female n | 8 |
| Age yrs | 65.1±8.7 |
| BMI kg·m−2 | 28.2±8.6 |
| FVC % pred | 50.2±11.1 |
| FEV1 % pred | 27.0±7.5 |
| FEV1/FVC % | 48.2±12.3 |
| TLC % pred | 115.6±27.3 |
| RV % pred | 244.0±66.4 |
| PI,maxpeak % pred | 51.7±28.3 |
| PI,max1.0 % pred | 46.2±22.9 |
| P0.1 kPa | 0.40±0.20 |
| P0.1×tI/VT kPa·s×L−1 | 0.76±0.29 |
Data are presented as mean±sd, unless otherwise stated. BMI: body mass index; FVC: forced vital capacity; % pred: % predicted; FEV1: forced expiratory volume in one second; TLC: total lung capacity; RV: residual volume; PI,maxpeak: peak maximal inspiratory mouth pressure; PI,max1.0: plateau maximal inspiratory mouth pressure sustained for 1 s; P0.1: mouth occlusion pressure 0.1 s after onset of inspiration during normal breathing; tI: inspiratory time, VT: tidal volume.