Why does severe dehydration impair thermoregulation more significantly in elderly individuals compared to younger adults during prolonged exposure to high ambient temperatures?

💡 Explanation

Elderly individuals often have reduced cardiovascular function and decreased skin elasticity, which impairs cutaneous vasodilation, a crucial mechanism for heat dissipation. Because vasodilation is compromised, the elderly are less efficient at transferring heat from the body core to the skin surface for convective and radiative heat loss; therefore, reduced cutaneous vasodilation increases the risk of hyperthermia rather than improved sweat gland function.

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