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Will Stone

A discovery in the muscles of long COVID patients may explain exercise troubles

Covid-19 David Putrino Akiko Iwasaki

For patients with long COVID, exercise can lead to a worsening of symptoms, a condition called post-exertional malaise. New research shows what's going on in their muscles. (Erik Isakson/Getty Images/Tetra images RF)

Hit the gym. Get back in shape.

That's what many patients with long COVID are told when they talk of the crushing fatigue that envelops them after even a light bout of physical activity.

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