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As a heatwave grips the U.S., a look at how extreme heat affects the body

NPR | By A Martínez

Published July 2, 2026 at 2:48 AM MDT

As heatwaves sweep the country, NPR's A Martinez asks W. Larry Kenney, professor of physiology and kinesiology at Penn State University, how extreme heat affects humans.

A Martínez

A Martínez is one of the hosts of Morning Edition and Up First. He came to NPR in 2021 and is based out of NPR West.

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