Re: exercise intolerance- the mitochondrial disorder. is it possible that this and cfs could be one and the same? any studies done to check this out?

Not likely: Easy fatigue is just one symptom of mitochondrial disease which is a rare medical condition cause by mutations in mitochondrial genes encoding enzymes involve in cellular oxidative metabolism.In contrast to chronic fatigue syndrome which is not uncommon,mitochondrial disorders are often associated with-neurological and cardiac dysfunction and abnormal muscle biopsy