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News
A new study finds that just three days of heat wave conditions raise core body temperatures in older adults by 0.4°C — triggering a cascade of effects on the heart, kidneys, gut, and brain. Crucially, these harms occurred even when participants were fully hydrated. Researchers are calling for evidence-based cooling strategies and better housing standards for older populations.
A small but striking clinical trial published in The Lancet Planetary Health reveals that even a simulated three-day heat wave can push older adults' bodies to their limits. Eighteen participants were exposed to heat wave conditions (34°C daytime, 26°C nighttime) and a thermoneutral control in a randomized crossover design — and the results showed multisystem strain across the board.
Despite staying hydrated, participants experienced drops in blood pressure, signs of kidney and gut stress, and measurable declines in cognitive function and balance. Researchers warn that real-world heat waves — which can last a week or more — and older adults with comorbidities or on medications could face far worse outcomes.
By the Numbers:
Why it matters: With climate change intensifying heat waves globally, this study underscores an urgent need for temperature-regulated housing and clear heat safety thresholds for older adults — a population that is quietly but seriously at risk.
