FIG. 4.

(A) Ambulatory blood pressure monitoring (ABPM) profiles from an able-bodied subject (female, 29 years) with preserved physiological nocturnal dip (>10% drop in systolic blood pressure [SBP] from day- to nighttime) and normal daily blood pressure and heart rate variability due to increased physical bouts, such as walking upstairs. (B) Recordings from a subject with complete tetraplegia (C5, American Spinal Injury Association Impairment Scale B, male, 58 years) showing loss of nocturnal dip, multiple episodes of autonomic dysreflexia and hypotension ranging from 180 to 71 mm Hg SBP. Shaded time section represents nighttime. These ABPM profiles are examples from our laboratory.