Association between atmospheric air temperature and blood pressure among adult population in different seasons of year

There is a tendency for the incidence of arterial hypertension (AH) to increase in the Arkhangelsk region. Despite the ease of diagnosing AH and the availability of treatment, about half of AH patients are not aware of their disease, and don't take the recommended drugs. In combination with the harsh climatic conditions of the northern regions, this can lead to early myocardial infarctions and strokes. The aim is to study the association between atmospheric air temperature and blood pressure (BP) among the adult population in the Arkhangelsk. Methods. The data of blood pressure measurement in 2342 participants of the "Know your heart" study in the age group of 35-69 years, conducted in Arkhangelsk in the period from November 1, 2015 to October 31, 2017, were used. Each BP measurement was associated with time-corresponding readings of atmospheric air temperature in the Arkhangelsk, which were recorded by the city meteorological station with a frequency of 8 times a day. To assess the effect of air temperature on BP, a linear regression analysis was used separately for the warm (April 16October 15) and cold (October 16April 15) seasons. Results: In the warm season of the year, in the group of participants without AH and in those with treated AH, high values of atmospheric air temperature (17.5-26.5С) relative to the average level (8.8-12.2С) cause a decrease in systolic blood pressure (SBP) at 7.9 mm Hg (p=0.004) and 8.5 mm Hg (p=0.012), respectively, and diastolic blood pressure (DBP) by 5.1 mm Hg (p=0.002) and 4.5 mm Hg (p=0.021), respectively. In the group of persons with untreated AH, changes in ambient air temperature above (12.3-17.2С) and below (6.0-8.7С) the average level for this period cause an increase in SBP by 11.7 mm Hg (p=0.044) and 16.9 mm Hg (p = 0.004)