How Extreme Heat Affects the Body
The New Yorker Radio Hour26 Aug 2025

How Extreme Heat Affects the Body

The Korey Stringer Institute, at the University of Connecticut, is named after an N.F.L. player who died of exertional heatstroke. The lab’s main research subjects have been athletes, members of the military, and laborers. But, with the extreme heat wrought by climate change, even mild exertion will put more and more of us in harm’s way; in many parts of the United States, a combined heat wave and power outage could cause staggering fatalities. Dhruv Khullar, a New Yorker contributor, practicing physician, and professor of health policy, visited the Stringer Institute to undergo a heat test—walking uphill, for ninety minutes, in a hundred-and-four-degree heat—to better understand what’s happening. “I just feel extremely puffy everywhere,” Khullar sighed. “You’d have to cut my finger off just to get my wedding ring off.” By the end of the test, he spoke of experiencing cramps, dizziness, and a headache. Khullar discussed the dangers of heatstroke with Douglas Casa, the lab’s head, who nearly died of the condition as a young athlete. “Climate change has taken this into the everyday world for the everyday American citizen. You don’t have to be a laborer working for twelve hours; you don’t have to be a soldier in training,” Casa tells him. “This is making it affect so many people, even just during daily living.” Although the treatment for heat-related illness is straightforward, Casa says that implementation of simple preventive measures remains challenging—and that there is much we need to do to better prepare for the global rise in temperatures.

This segment originally aired on August 25, 2023.

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