Effects of pre-breathing oxygen and air on 6 minute walk distance, oxygen saturation, breathlessness, and recovery time in 34 patients with COPD
| Oxygen | Air | Mean difference | p value | 95% CI | |
|---|---|---|---|---|---|
| Values are mean (SE) with 95% confidence limits for differences. | |||||
| Distance walked (m) | 288 (20.8) | 283 (20.3) | 5 | NS | −1.2 to +9.7 |
| Fall in Sao2 (%) | 11.0 (1.1) | 9.4 (1.1) | 1.6 | <0.01 | +0.4 to +2.8 |
| Change in VAS between baseline and end of walk (mm) | 58 (4.3) | 54 (3.8) | 4 | NS | −1.2 to +9.7 |
| Subjective recovery time (s) | 111 (19.6) | 142 (16.5) | 13 | NS | −12 to +37 |
| Objective recovery time (s) | 177 (20.6) | 184 (31.7) | 7 | NS | −59 to +73 |