What Really Causes Runner’s High?

What actually produces that feeling of euphoria?

By GRETCHEN REYNOLDS

For decades, endorphins have hogged the credit for producing “runner’s high,” that fleeting sense of euphoria and calm that many people report experiencing after prolonged exercise. Who among us, after an especially satisfying workout, hasn’t thought, “ah, my endorphins are kicking in.” Endorphins are the world’s sole celebrity peptide.

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Published: February 16, 2011