Who: Michael VanElzakker, PhD, Massachusetts General Hospital/ Harvard Medical School is looking for participants living in, or near the Boston area to join his study.

What: Participants will rest on their backs in a high-resolution MRI machine that is capable of measuring both the concentrations of certain chemicals and the movement of oxygenated blood in the brain. The scanning procedure will be repeated 1-3 days later, after ME symptoms are provoked with an exercise challenge. Participants will be compensated $150 for completion of the study.

When: Ongoing.

Where: Massachusetts General Hospital/ Harvard Medical School, Boston, MA (must live near Boston to participate).