(A) Controls (CON), (B) late-onset delayed orthostatic hypotension (dOH, onset >10 min), (C) early-onset dOH (onset 3–10 min), and (D) immediate orthostatic hypotension (OH) (onset <3 min). Abbreviations: a, BRSv; b, difference between baseline and nadir systolic blood pressure of phase 3; PRT, pressure recovery time; P1, phase 1; P2e, early phase 2; P2l, late phase 2; P3, phase 3; P4, phase 4.