Cold-induced vasodilation
Fingers activate their own rescue plan in extreme cold
Human fingers possess a built-in protective mechanism against extreme cold. This is shown by physiologist Rebecca Weller’s research into cold-induced vasodilation (CIVD): a physiological response in which the blood vessels in the fingers temporarily reopen after cooling, allowing warm blood to flow back in. These unexpected “waves of warmth” help preserve sensation, movement, and tissue in the hands for as long as possible. CIVD should primarily be seen as a supportive defense mechanism of the body, not as a substitute for proper protection against the cold.
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