Figure 2. Mean arterial pressure and heart rate at baseline and in response to intravenous terbutaline before (left panel) and after (right panel) dietary sodium restriction in Gly16 and Arg16 subjects.

There were no baseline differences in the mean arterial pressure (MAP) and heart rate (HR) before and after the low-Na⁺ diet. Terbutaline decreased MAP (P < 0.001), and there was no evidence that sodium restriction or genotype influenced the MAP response. Terbutaline increased HR (P < 0.001), and there was no evidence that sodium restriction or genotype influenced the HR response. Error bars denote s.d.