Figure 2.

Metabolic parameters during graded normoxic and hypoxic exercise. Shown are (A and B) respiratory quotient (R; R = $\stackrel{.}{\text{V}}$o₂/$\stackrel{.}{\text{V}}$co₂), (C and D) pH, (E and F) bicarbonate (HCO₃^–), (G and H) base excess of the extracellular fluid (BE_ecf), and (I and J) body temperature throughout (A, C, E, G, and I) normoxic and (B, D, F, H, and J) hypoxic progressive exercise (plotted as the 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.