If a hiker ascends to high altitude, experiencing hypothermia despite wearing insulated clothing, which mechanism explains why core body temperature continues to drop despite maximal shivering?

💡 Explanation

Evaporative cooling from increased respiration rate at high altitude removes substantial heat, and this can overwhelm the heat generated by shivering, because the phase change from liquid to gas absorbs energy. Therefore, cooling continues despite shivering, rather than metabolic rate being insufficient or radiative heat loss dominating.

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