David Systrom, a Harvard pulmonologist, uses invasive CPET tests to find that oxygen extraction problems at the muscle level are common in ME/CFS. Chronic fatigue syndrome (ME/CFS) has a reputation for falling through the cracks. Test after test is run to no avail.  From the unusually devastating effects on functionality … Continue reading Poor Oxygen Extraction is Contributing to Exercise Intolerance in Chronic Fatigue Syndrome (ME/CFS)