Exertional Exhaustion in Chronic Fatigue Syndrome

Inclusion Criteria: CFS and healthy subjects Exclusion Criteria: * HIV / AIDS subjects * Pregnant women * Lactation * Cognitive impairment, mental retardation, severe head injury, stroke, proven multiple sclerosis, "melancholic" suicidal major depression, schizophrenia, Alzheimer's disease, "mild cognitive impairment" (MCI), other dementia, or other serious neurological diseases * Brain injury. stroke, severe head injury (concussion, severe motor vehicle accidents), bleeding into brain, have been unconscious for more than 1 day (in a coma), seizures, brain inflammation such as multiple sclerosis or lupus. * Metal implants such as prostheses, wires, plates, or screws that may heat up in the magnetic resonance imaging scanner and cause harm. * Claustrophobia. * Abnormal laboratory and questionnaire results. * Heart, lung, kidney, arthritis, autoimmune, cancer, and other chronic illnesses, leg amputations heart attacks (myocardial infarction), coronary artery disease, abnormal heart rhythms, congestive heart failure, heart valve disease, uncontrolled high blood pressure or strokes, lung disease from smoking or other causes, painful, swollen or deformed joints related to arthritis or autoimmune diseases, weakness from nerve damage, kidney disease on dialysis, liver disease (alcoholic cirrhosis, hepatitis B, hepatitis C), inflammatory bowel disease (Crohn's disease, ulcerative colitis), or cancer Subjects may participate if they have well-controlled diabetes or thyroid disease.…