Results of the stepwise regression analysis for peak oxygen uptake (V˙o 2) in ml/min/kg
| Partial r | Cumulative r2 | p value | |
| FRC (% pred) | –0.49 | 0.24 | 0.0002 |
| CS (μmol/min/g muscle) | 0.33 | 0.35 | 0.006 |
| O2 desaturation (%) | –0.34 | 0.46 | 0.002 |
| Age (years) | –0.25 | 0.52 | 0.018 |
| IC (% pred) | 0.25 | 0.59 | 0.012 |
FRC = functional residual capacity; CS = citrate synthase; IC = inspiratory capacity.