Incremental cardiopulmonary exercise on a cycle ergometer (peak exercise data) in patients with chronic hypersensitivity pneumonitis
| V′O2 ≥84% pred | V′O2 <84% pred | p-value | |
| Subjects n | 14 | 14 | |
| Exercise time min | 8.4±2.4 | 6.0±2.5 | 0.02 |
| Work rate W | 83.4±36 | 47.86±24 | 0.005 |
| Work rate %pred | 70.0±17 | 36.0±15 | <0.001 |
| V′O2 mL·min−1·kg−1 | 20.51±6.42 | 20.51±6.42 | 0.006 |
| V′O2 % pred | 99±12 | 63±11 | <0.001 |
| ΔPETCO2 mmHg | 0.06±2.39 | -0.53±2.99 | 0.56 |
| RER | 1.04±0.12 | 1.03±0.16 | 0.81 |
| V′E/V′CO2 slope | 34±3.6 | 39±5.0 | 0.004 |
| V′E L·min−1 | 57 (47–78) | 44 (40–54) | 0.04 |
| Breathing reserve %MVV | 11 (6.6–26.3) | 22 (1.0–40.7) | 0.60 |
| VT L | 1.15 (0.97–1.67) | 0.84 (0.78–0.90) | 0.002 |
| Respiratory rate breaths·min−1 | 49±8 | 54±12 | 0.21 |
| HR beats·min−1 | 139±13 | 128±23 | 0.12 |
| HR % pred | 88±7 | 78±12 | 0.009 |
| V′O2/HR mL·beat−1·min−1 | 10.8±3.1 | 8.2±2.0 | 0.02 |
| V′O2/HR % pred | 107±11 | 80±13 | <0.001 |
| SpO2 % | 83±6 | 79±8 | 0.10 |
| Borg dyspnoea score | 5 (4–9) | 9 (5–10) | 0.13 |
| Borg leg discomfort score | 7 (5–9) | 9 (2–9) | 0.91 |
| ΔIC from rest L | -0.01±0.27 | -0.02±0.12 | 0.94 |
| ΔIC from rest % | 2.5±16 | 1.4±9 | 0.81 |
| VT/IC | 0.80±0.13 | 0.75±0.17 | 0.40 |
Data are presented as mean±sd or median (25th–75th percentile), unless otherwise stated. V′O2: oxygen production; PETCO2: end-tidal carbon dioxide tension; RER: respiratory exchange rate; V′E: minute ventilation; V′CO2: carbon dioxide production; MVV: maximal voluntary ventilation; VT: tidal volume; HR: heart rate; IC: inspiratory capacity; SpO2: arterial oxygen saturation measured by pulse oximetry.