Figure 3.
Arterial blood gases, pulmonary gas exchange efficiency, and its components during normoxic and hypoxic exercise. Shown are (A and B) alveolar oxygen tension (PaO2), (C and D) PaO2, (E and F) PaCO2, (G and H) oxygen saturation as measured by pulse oximetry (SpO2), and (I and J) pulmonary gas exchange efficiency (a–aDo2) throughout (A, C, E, G, and I) normoxic and (B, D, F, H, and J) hypoxic progressive exercise (plotted as increasing percent maximal wattage at volitional exhaustion) in control adults (CTL; red triangles) and preterm adults (PT; open circles). Values are plotted for each individual throughout exercise.