title: Changes in human blood pressure with season, age and solar cycles: a 26 year record.
abstract: The record was studied of a 71-year-old, diurnally active (0700-2200 hours) male psychiatrist (G.N.) who self-measured systolic and diastolic blood pressure (BPS and BPD) mostly but not exclusively on Sunday mornings, from 1969 to 1994. A large about-yearly change was revealed which increased with age and was accompanied by a decreasing trend in the yearly rhythm-adjusted mean (MESOR; P < 0.01). According to conventional criteria that specify only upper limits of acceptability, G.N. was hypertensive in summer and normotensive in other seasons. Since changes in both MESOR and circannual amplitude occurred, a systematic surveillance of BP is the chronobiological recommendation.
authors.affiliation: Chronobiology Laboratory, University of Minnesota, Minneapolis 55455, USA.
authors.forename: A
authors.initials: A
authors.lastname: Portela
authors.forename: G
authors.initials: G
authors.lastname: Northrup
authors.forename: F
authors.initials: F
authors.lastname: Halberg
authors.forename: G
authors.initials: G
authors.lastname: Cornélissen
authors.forename: H
authors.initials: H
authors.lastname: Wendt
authors.forename: J C
authors.initials: JC
authors.lastname: Melby
authors.forename: E
authors.initials: E
authors.lastname: Haus
mesh_terms: D000367:Age Factors; D000368:Aged; D001794:Blood Pressure / Q000502:physiology*; D002909:Chronobiology Phenomena; D006801:Humans; D008297:Male; D012621:Seasons; D016082:Solar System