Fig. 1. (  A ) Graph representing mean (SD) arterial pH at baseline and over the course the protocol with hypercapnic acidosis compared to normocapnia. (  B ) Graph representing mean (SD) arterial carbon dioxide tension at baseline and over the course the protocol with hypercapnic acidosis compared to normocapnia. * Significantly different from normocapnia (  P < 0.05, ANOVA). Pco²= carbon dioxide tension .