Whole-breath, inspiratory and expiratory results
| Forced oscillation parameters | Asthma FEV1 >60% predicted (n=20) | Asthma FEV1 <60% predicted (n=14) | COPD FEV1 >60% predicted (n=28) | COPD FEV1 <60% predicted (n=20) | Normal subjects (n=18) |
| R5 (kPa/l/s) | |||||
| Whole breath | 0.53±0.03 | 0.58±0.03 | 0.49±0.03 | 0.60±0.03 | 0.38±0.02 |
| Inspiratory | 0.49±0.03 | 0.54±0.03 | 0.45±0.04 | 0.54±0.04 | 0.36±0.02 |
| Expiratory | 0.55±0.19 | 0.59±0.04 | 0.52±0.04 | 0.63±0.04 | 0.39±0.02 |
| ΔR5 | −0.06±0.02 | −0.05±0.02 | −0.07±0.02 | −0.09±0.02 | −0.02±0.01 |
| X5 (kPa/l/s) | |||||
| Whole breath | −0.22±0.03 | −0.31±0.05 | −0.20±0.02 | −0.34±0.03 | −0.11±0.01 |
| Inspiratory | −0.17±0.03 | −0.26±0.03 | −0.18±0.02 | −0.23±0.02 | −0.12±0.01 |
| Expiratory | −0.23±0.04 | −0.36±0.07 | −0.22±0.03 | −0.44±0.04 | −0.11±0.01 |
| ΔX5 | 0.06±0.03 | 0.10±0.07 | 0.05±0.02 | 0.21±0.03 | −0.01±0.01 |
| Fres (Hz) | 18.82±1.07 | 22.52±1.67 | 19.24.±0.89 | 23.80±0.92 | 13.08±0.89 |
| R15 (kPa/l/s) | 0.37±0.02 | 0.37±0.02 | 0.34±0.01 | 0.36±0.03 | 0.31±0.02 |
Values are mean±SEM.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; Fres, resonant frequency; R5, resistance at 5 Hz; R15, resistance at 15 Hz; X5, reactance at 5 Hz.