Health. Heatwave: Beware of Heart Risks!
When it's hot, the body needs to maintain its internal temperature around 37°C. To do this, it increases blood circulation to the skin to expel heat through sweat.
This thermoregulation work strongly mobilizes the cardiovascular system. The result is an acceleration of the heart rate, a drop in blood pressure due to the dilation of the blood vessels and a risk of dehydration because of sweating.
These mechanisms increase the workload of the heart. For a healthy person, this is often bearable.
But in the elderly, those with heart disease, diabetes, or kidney failure, this can lead to abnormal heart rhythms, discomfort, and even serious cardiovascular events, such as heart attacks or strokes.
Visible effects even in the brainAdditionally, researchers have highlighted a link between high temperatures and cognitive impairment, especially in older people living alone or without air conditioning.
As the heart has more difficulty oxygenating the brain properly in very hot weather, problems with alertness, concentration and even loss of consciousness can occur.
Working in hot conditions, an underestimated riskPeople who engage in intense physical activity in the heat (workers, farmers, etc.) are particularly at risk. According to the French National Institute for Research and Safety (INRS), physical exertion combined with high temperatures increases the risk of heat stroke, heat exhaustion, and heart problems.
How to protect your heart during hot weather?Simple actions can reduce these risks:
– Hydrate regularly, even when not thirsty;
– Avoid intense physical exertion during the hottest hours (12 p.m. – 5 p.m.);
– Stay cool (air-conditioned or shaded rooms);
– Limit alcoholic or caffeinated drinks, which promote dehydration;
– Watch for warning signs: palpitations, unusual fatigue, dizziness, shortness of breath.
Source : Prevention Observatory of the Montreal Heart Institute - ICM Foundation - National Institute for Research and Safety - Cardiovascular Research Foundation
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