| Manoeuvre | Subjects n | Relaxed mm2 | Contracted mm2 | Airway narrowing % |
| Deep inspiration | 5 | 14.2±2.7 | 9.2±2.6 | 38.6±8.1 |
| Partial expiration | 5 | 14.8±2.6 | 8.7±1.9 | 35.3±6.4 |
| Maximal expiration | 5 | 13.4±2.9 | 9.5±1.9 | 35.1±4.9 |
Data are presented as mean±sem, unless otherwise stated. Airway narrowing was calculated from the percentage reduction in lumen area. Prior to each manoeuvre, lumen area (p=0.6166) and airway narrowing (p=0.8005) were similar between groups.