Table 4.
Characteristics of patients (± SD) separated into hypercapnic and normocapnic groups
| COPD normocapnic | COPD hypercapnic | |
|---|---|---|
| N | 9 (5 male) | 9 (5 male) |
| Age | 64.3 ± 6.1 | 67.6 ± 5.1 |
| Height (cm) | 160.1 ± 3.8 | 164.6 ± 3.2 |
| Weight (kg) | 76.8 ± 3.7 | 74.6 ± 3.1 |
| MVC (N) | 239 ± 56 | 250 ± 51 |
| Resting SBP (mmHg) | 116 ± 4.6 | 121 ± 3.9 |
| Resting DBP (mmHg) | 77 ± 2.6 | 74 ± 1.9 |
| Resting MAP (mmHg) | 91 ± 3.2 | 89 ± 3.6 |
| Resting HR (bpm) | 71 ± 1.6 | 67 ± 1.3 |
| FEV1 (l) | 1 ± 0.2 | 1.13 ± 0.3 |
| FEV1 (% predicted) | 43.5 ± 5.1 | 40.5 ± 6.4 |
| FVC (l) | 2.24 ± 0.7 | 2.45 ± 0.8 |
| FEV1/FVC (%) | 44 ± 5.1 | 47 ± 4.3 |
| (mmHg) | 71.6 ± 5.3 | 63.3 ± 6.4* |
| (mmHg) | 37.7 ± 3.3 | 49.2 ± 2.7* |
| pH | 7.41 ± 0.04 | 7.4 ± 0.03 |
| HCO3 (mequiv l−1) | 25.3 ± 1.4 | 30.2 ± 1.6* |
*Significant difference from normocapnic participants (P < 0.05). FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; HCO3 −, arterial bicarbonate content; MVC, maximal voluntary contraction force.