Mechanisms of Physical Activity Limitation in Chronic Lung Diseases
Figure 2
Mean arterial oxygen and carbon dioxide tension during exercise in chronic lung diseases. Arterial oxygen tension (PaO2) and carbon dioxide tension (PaCO2) as a function of oxygen uptake at rest and during high-intensity exercise in COPD (a and b; range of to 23); ILD (c and d; range of to 12); PVD (e and f; rage of to 11). Exercise usually causes PaO2 to fall in all three diseases. PaCO2 often rises in COPD but falls or does not change in ILD, PVD, and healthy subjects (□). With permission from Agusti et al., 1997 [43].
