A, arterial Con (▪), Alk (□) and venous Con (•), Alk (▿) PCO2. B, arterial Con (▪), Alk (□) and venous Con (•), Alk (▿) PO2. *Different from rest (P < 0.05, main effect for time). †Treatment main effect for Pv,CO2 during exercise (P < 0.05). ‡Treatment effect for Pa,CO2 during exercise (P= 0.068, Cohen's d= 0.4). Sample size and data presentation as in Fig. 3.