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Cold stress physiology — UKMLA MCQ

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ModerateExercise PhysiologyCold stress physiologyUKMLA

A runner exercising in cold rain begins shivering, becomes clumsy and slows despite adequate carbohydrate intake. What is the physiological explanation?

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Correct answer: B — Peripheral vasoconstriction and shivering reflect thermoregulatory defence against falling core temperature

Cold exposure triggers vasoconstriction to reduce heat loss and shivering to generate heat. Wet and windy conditions increase convective and evaporative heat loss. Clumsiness may signal clinically important hypothermia.

Reference: IOC environmental medicine guidance