Characteristics of subjects (n = 22)
| Mean (SD) | Range | |
|---|---|---|
| FEV1, forced expiratory volume in 1 s; Sao2, oxygen saturation. | ||
| Age (years) | 72.0 (7.3) | 56–86 |
| FEV1 (litres) | 0.87 (0.38) | 0.40–1.69 |
| FEV1 (% predicted) | 38.0 (16.1) | 17–74 |
| Sao2 (%) resting, on air | 93.1 (3.8) | 82–98 |
| Desaturation with activity (%) | −7.5 | −25 to −0.5 |