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.
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Portela, A., Northrup, G., Halberg, F. et al. Changes in human blood pressure with season, age and solar cycles: A 26-year record. Int J Biometeorol 39, 176–181 (1996). https://doi.org/10.1007/BF01221388
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DOI: https://doi.org/10.1007/BF01221388