Skip to main content
. Author manuscript; available in PMC: 2012 Sep 5.
Published in final edited form as: Exp Physiol. 2008 Mar 7;93(6):715–724. doi: 10.1113/expphysiol.2007.039545

Figure 4. MSNA and blood pressure.

Figure 4

Left panel shows the relationship between muscle sympathetic nerve activity (MSNA) and mean arterial pressure in males and females below and above 40 years of age. In the younger cohorts there was no relationship between MSNA and mean arterial pressure. By contrast, in those over 40 years of age, increases in MSNA showed some influence on mean arterial pressure. Right panel shows MSNA expressed either as bursts per minute or bursts per 100 heartbeats in middle-aged, normotensive and hypertensive subjects. In these cohorts, there are no dramatic differences in MSNA. (Left panel from Narkiewicz et al. 2005; right panel from Gudbjörnsdóttir et al. 1996, with permission.)