title: Is time of the essence? The continuing search for a noninvasive measure of sympathetic adrenergic function.
authors.forename: Roy
authors.initials: R
authors.lastname: Freeman
authors.forename: Christopher
authors.initials: C
authors.lastname: Gibbons
mesh_terms: D001342:Autonomic Nervous System Diseases / Q000175:diagnosis* / Q000503:physiopathology*; D001794:Blood Pressure / Q000502:physiology*; D001808:Blood Vessels / Q000294:innervation / Q000502:physiology / Q000503:physiopathology; D006801:Humans; D007024:Hypotension, Orthostatic / Q000175:diagnosis / Q000503:physiopathology; D009460:Neurologic Examination / Q000379:methods / Q000592:standards; D009638:Norepinephrine / Q000032:analysis* / Q000097:blood*; D011237:Predictive Value of Tests; D011930:Reaction Time / Q000502:physiology; D017779:Sympathetic Fibers, Postganglionic / Q000502:physiology / Q000503:physiopathology; D013564:Sympathetic Nervous System / Q000502:physiology*; D013997:Time Factors; D014636:Valsalva Maneuver / Q000502:physiology
chemical_list: D009638:Norepinephrine