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Can physical activity boost our resilience to rising temperatures?

When exposed to heat, the body deploys several responses to try to dissipate it. The first is conscious and depends on behavioural decisions we make to minimize exposure, such as seeking a cool place, switching on a fan or reducing our physical activity. Secondly, if these strategies are not sufficient, the brain activates physiological responses that are beyond our control; blood vessels in the skin dilate to increase the blood supply and sweat glands increase their activity to excrete more sweat.