Patients push limits for clues to chronic fatigue syndrome

In this Nov. 20, 2019 image from video, Zach Ault is fitted with an EEG cap which uses electrodes to track the electrical activity of his brain, at the National Institutes of Health's hospital in Bethesda, Md. (AP)

BETHESDA, Md. (AP) - Researchers hooked Zach Ault to medical monitors as he slowly climbed onto a gym bike. An invisible disease is sidelining this once avid athlete and he knew the simple exercise would wipe him out - but Ault was pedaling for science.

Chronic fatigue syndrome is one of medicine's most vexing mysteries. Now doctors at the National Institutes of Health are using volunteers like Ault for a unique study that pushes their limits in search of what's stealing all their energy.

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