Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Possible mechanisms for plasma renin activity (PRA), aldosterone (ALDO), and hemodynamics including cardiac output (CO), stroke volume (SV), total peripheral resistance (TPR), heart rate (HR), and blood pressure (BP), during prolonged standing in POTS women during the early follicular phase (EFP) and mid-luteal phase (ML) of the menstrual cycle.
