As a heat wave hits the US, a look at how extreme heat affects the body: NPR0

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• July 3, 2026

As heat waves 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. TO MARTINEZ, HOST: A dangerous heat wave is hitting parts of the central and eastern United States and is expected to last through the Fourth of July weekend.