Original Article

International Journal of Biometeorology

, Volume 39, Issue 4, pp 176-181

Changes in human blood pressure with season, age and solar cycles: A 26-year record

  • Ana PortelaAffiliated withChronobiology Laboratories, University of MinnesotaPhysiology Department, Faculty of Veterinary Medicine, Complutense University of Madrid
  • , Gordon NorthrupAffiliated withChronobiology Laboratories, University of Minnesota
  • , Franz HalbergAffiliated withChronobiology Laboratories, University of Minnesota
  • , Germaine CornélissenAffiliated withChronobiology Laboratories, University of Minnesota
  • , Hans WendtAffiliated withChronobiology Laboratories, University of Minnesota
  • , James C. MelbyAffiliated withThe University Hospital, Boston University Medical Center
  • , Erhard HausAffiliated withSt. Paul-Ramsey Medical Center

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access


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.

Key words

Amplitude Blood pressure Circadian Circannual Cosinor