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Figure 3 Arginine vasopressin (top panel) and atrial natriuretic peptide (ANP) (bottom panel) concentrations drawn at rest in the standing posture for age-matched healthy control subjects; heart transplant recipients; heart failure patients before four months’ exercise training; and heart failure patients after four months’ exercise training. Data are mean ± SEM. *p 0.05 heart failure before training versus the other three groups. p 0.05 versus heart failure after training and normal control group.