Figure 2.

Subject enrollment. Twenty‐five subjects were screened and found eligible for study participation. Twenty‐three subjects began Study Day 1. A clear MSNA signal could not be obtained in n = 3 and one subject became syncopal during instrumentation. Of the nineteen individuals with complete data for Study Day 1, one did not return for Study Day 2. Study Day 2 resulted in 3 presyncopal events and 1 equipment error. Complete data are presented from n = 14. MSNA, muscle sympathetic nerve activity