Fig. 1.

Representative phasic blood pressure (BP; top) and time-averaged heart rate (HR; bottom) are shown for a control subject who had initial orthostatic hypotension (IOH). Events are as follows: stand = standing initiate; min BP =the nadir or lowest blood pressure achieved after standing; peak HR = the maximum HR achieved after standing; BP recovery = the first local maximum of BP after standing; min HR (HR recovery) = the lowest HR after standing; steady state HR = HR increases after HR recovery until it achieves a steady slope. bpm, beats/min.