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Figure 3 Exercise increase in the total plasma venous concentrations of natriuretic peptides, as determined by the difference between exercise and rest values (top), or as percentages of the baseline resting values (bottom) for patients stratified into two groups according to the exercise increase in heart rate (< or 51 beats/min) and into two subgroups as a function of the presence (black bars) or absence (white bars) of beta-blocker treatment. The hatched portion of each bar represents the part related to the atrial natriuretic peptide concentration and the open portion of each bar represents the brain natriuretic peptide. *p < 0.05.