Figure 5.

The time course of the dependent acid-base variable plasma hydrogen ion concentration ([H⁺]) after a Competition Exercise Test, and the contributions of the independent variables ([SID], solid square), total weak acid concentration ([A_tot], hollow circle) or partial pressure of carbon dioxide (PCO₂, solid triangle) to the change in plasma [H⁺], for (B) the NAA trial and (C) the Control trial. The exercise recovery period begins at 0 min, after horses were either given a hypertonic sodium acetate/acetic acid solution (NAA trial; solid square), or stood in stocks (Control trial; hollow circle). Horses were fed immediately after the 0 and 360 min samples. Values are mean ± SE for 9 horses. *, Ψ: significantly different from baseline (pre-exercise) time point for Control and NAA trials, respectively.