Patient characteristics
| Asthma (n=34) | Asthma FEV1 <60% predicted (n=14) | COPD (n=48) | COPD FEV1 <60% predicted (n=28) | Normals (n=18) | |
| Age (years) | 49±3 | 48±4 | 64±2 | 65±2 | 37±2 |
| Sex (M/F) | 15/19 | 7/7 | 32/16 | 18/10 | 8/10 |
| FEV1 (% predicted) | 69±4 | 49±3 | 59±3 | 44±3 | 97±3 |
| Current smokers | 0 | 0 | 21 | 11 | 0 |
| Ex-smokers | 8 | 8 | 27 | 17 | 0 |
| Treatment | |||||
| Inhaled β-adrenergics | 34 | 14 | 48 | 28 | 0 |
| Theophylline | 0 | 0 | 0 | 0 | 0 |
| Inhaled corticosteroids | 24 | 14 | 22 | 20 | 0 |
| Oral steroids | 0 | 0 | 0 | 0 | 0 |
Values are means±SEM.
COPD, chronic obstructive pulmonary disease; F, female; FEV1, forced expiratory volume in 1 s; M, male.