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Dr J. Mark VanNess, PhD, is a member of the scientific advisory committee of the Workwell Foundation which specializes in two-day cardiopulmonary exercise test (2-day CPET) for myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), fibromyalgia and other fatiguing conditions. He has been working on ME/CFS since 1999, and is particularly interested in issues of autonomic dysfunction and mechanisms that produce post-exertional malaise.

Dr VanNess serves as an Associate Professor of Health, Exercise & Sport Sciences, Department of Sport Sciences, and an Adjunct Instructor at the College of Engineering, both at the University of the Pacific, Stockton, California. (more...)

two-day cardiopulmonary exercise test (CPET) - A diagnostic test which involves testing an ME/CFS patient exercising on an exercise machine, while monitoring their respiration, especially oxygen consumption. This test is repeated the following day in order to confirm the patient's inability to replicate the first-day performance. This test is thought to be the most objective way to detect post-exertional malaise.

See two-day cardiopulmonary exercise test.

See myalgic encephalomyelitis.

See chronic fatigue syndrome.