Table 2.
Relationship of resting pulmonary function tests to exercise tolerance. FEV1: air volume exhaled in 1 s of forceful expiration, FEV1/IVC – ratio of FEV1 to inspiratory vital capacity, IVC – inspiratory vital capacity, PImax - maximal static pressure generated by inspiratory muscles measured in the oral cavity, TTmus – non-invasive tension/time index, RV – residual volume, RV/TLC – ratio of residual volume to total lung capacity, TLCO – pulmonary carbon monoxide transfer factor, KCO – pulmonary carbon monoxide transfer coefficient, 6MWD – distance reached during the 6-min walk-test, pVO2 (6MWT) - peak oxygen consumption achieved during the 6-min walk-test, pVO2 (CPET) - peak oxygen consumption achieved during cardiopulmonary exercise test.
| 6MWD | pVO2 (6MWT) | pVO2 (CPET) | |
|---|---|---|---|
| FEV1 | r = 0.4248 P = 0.0789 |
r = 0.2645 P = 0.2889 |
r = 0.5317 P = 0.0231 |
| FEV1/IVC | r = 0,8296 P = 0.2438 |
r = 0.1619 P = 0.5209 |
r = 0.5661 P = 0.0143 |
| IVC | r = 0.3277 P = 0.1843 |
r = 0.1977 P = 0.4315 |
r = 0.1995 P = 0.4273 |
| PImax | r = 0.1663 P = 0.5095 |
r = 0.2298 P = 0.359 |
r = −0.2472 P = 0.3227 |
| TTmus | r = −0.1299 P = 0.6074 |
r = −0.1271 P = 0.6154 |
r = 0.3008 P = 0.2252 |
| RV | r = −0.6085 P = 0.0074 |
r = −0.3469 P = 0.1584 |
r = −0.5247 P = 0.0254 |
| RV/TLC | r = −0.7301 P = 0.0006 |
r = −0.5436 P = 0.0197 |
r = −0.2146 P = 0.3924 |
| TLCO | r = 0.3046 P = 0.2191 |
r = 0.5463 P = 0.019 |
r = 0.5342 P = 0.0224 |
| KCO | r = 0.4695 P = 0.0493 |
r = 0.5721 P = 0.0131 |
r = 0.6918 P = 0.0015 |