Skeletal muscle bioenergetics in the chronic fatigue syndrome.
Barnes, P R, Taylor, D J, Kemp, G J et al.·Journal of neurology, neurosurgery, and psychiatry·1993
Researchers used a special type of MRI scan to measure how muscles use energy in ME/CFS patients compared to healthy people. They found that most patients had normal muscle energy use, but about a quarter showed unusual patterns in how their muscles handled acid buildup during exercise. This suggests muscle metabolism problems may exist in some, but not all, ME/CFS patients.