MSNA and ECG data.
MSNA and ECG data were exported from the LabChart data acquisition system to WinCPRS (Absolute Aliens) for blinded analysis. R waves were detected and marked from the continuous ECG recording. MSNA bursts were automatically detected by the program using the following criteria: 3:1 burst/noise ratio within a 0.5-second search window, with an average latency in burst occurrence of 1.2–1.4 seconds from the previous R-wave. After automatic detection, the ECG and MSNA neurograms were visually inspected for accuracy of detection by a single investigator. All MSNA data met previously established quality standards (