The group mean ΔHHb, ΔO2Hb, ΔHbtot and TOI responses for all subjects (n = 8) in Control (CON; ….) and hyperventilation-induced hypocapnic alkalosis (RALK; —) Dashed lines demarcate the pre-accommodation period (Pre-Acc), accommodation period (Acc), baseline cycling (20 W), and constant-load, moderate-intensity exercise (Mod).