Figure 1.

Representative phasic cerebral blood flow velocity (CBFv, A), blood pressure (BP, B), and time averaged heart rate (HR, C), and for a Control subject who had initial orthostatic hypotension (iOH). Marked events are: Baseline; Stand = Standing initiated; Min CBv = the nadir or lowest CBv achieved after standing; Min BP = the nadir or lowest blood pressure achieved after standing; Peak HR = the maximum HR achieved after standing; CBv Recovery = the first local maximum of CBv 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.