Here’s What Happens to Your Heart on a Hot Day

A new study by the Penn State University Human Environmental Age Thresholds (PSU HEAT) project, published July 2023 in the peer-reviewed Journal of Applied Physiology, uncovers the surprising impact of heat stress on heart health—especially in younger adults, revealing that heat stress kicks in under milder conditions and with less physical activity than previously thought.

The findings were startling.

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