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

Ana Portela, Gordon Northrup, Franz Halberg, Germaine G Cornelissen-Guillaume, Hans Wendt, James C. Melby, Erhard Haus

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10 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)176-181
Number of pages6
JournalInternational Journal of Biometeorology
Issue number4
StatePublished - Jan 1 1996


  • Amplitude
  • Blood pressure
  • Circadian
  • Circannual
  • Cosinor


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