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Fig. 2. (A) Cardiac output (), (B) arterial O2 delivery (o2), (C) Oxygen uptake (o2), (D) heart rate, (E) cardiac stroke volume (VSH), (F) systemic vascular resistance (Rsys) and (G) dorsal aortic blood pressure (PDA) in chinook salmon at progressively higher swimming velocities and after 1 h recovery (Rec.) following the swim to Ucrit. *Significant (P<0.05) difference from resting levels; {ddagger}significant (P<0.05) difference between exercise-trained (N=6) and control fish (N=6).