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Blood Pressure and Weather

What is the connection?

Winter
In January 2009, French scientists studied the relationship between outside temperature and Blood Pressure. They found that during the cold season, people's blood pressure is higher than in summer.

Nearly 9,000 individuals aged 65 and older were included in the study. They were examined at different times of the year and accordingly at different temperatures. It was found that in winter, the average systolic value was 5 mmHg higher than in the summer months.

If the participants had been classified as hypertensive (patients with High Blood Pressure) based on the measured values, one third would have been affected in winter, while only a quarter would have been affected in summer.

Especially older people over 80 years old are affected by the effect of different blood pressure values depending on the weather or outside temperature.

What are the reasons for this?

Summer
In summer, during heat, we sweat, thus losing moisture. To manage this, the body dilates/relaxes the peripheral blood vessels (which are located near the skin from the body's perspective). This allows more blood to flow into the peripheral vessels, causing blood pressure to drop. If too little is consumed, blood pressure decreases further due to fluid loss.

In cold, the reverse process occurs: To protect the body from heat loss, the peripheral blood vessels and capillaries constrict, allowing less blood to flow there - the existing amount of blood must therefore be transported at a higher pressure. For people with severe hypertension, this can be dangerous - even the risk of a heart attack increases in winter.

Sources:


This article is from BloodPressureDB the leading app since 2011 that supports hundreds of thousands in blood pressure monitoring every day. Our content is based on carefully researched, evidence-based data and is continuously updated (as of 04/2024).

Author Sabine Croci is a certified medical assistant with many years of experience in internal medicine and cardiology practices as well as in outpatient care, and has been leading the editorial team of BloodPressureDB since 2015. Thanks to her extensive additional qualifications as a paramedic, first responder, and in various therapy and emergency areas, she provides well-founded, practical, and reliably verified information.


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