Byrne, E, Trounce, I, Dennett, X · Australian and New Zealand journal of medicine · 1985 · DOI
This study examined two patients with ongoing muscle pain that started after a viral-like illness and came and went unpredictably. Doctors found the patients had weak muscle fibers and signs that their muscles weren't producing energy as efficiently as they should. The findings suggest these patients may have a mild form of ME/CFS, and importantly, their muscle problems were real biological issues rather than caused by psychological factors.
This early study provided objective biochemical evidence that ME/CFS-like illness involves measurable mitochondrial dysfunction, helping establish that the condition has a biological basis rather than being primarily psychological. For patients, this research supports the legitimacy of their symptoms and guides clinicians toward appropriate medical investigation rather than dismissing symptoms as psychosomatic.
As a two-patient case series from 1985, this study cannot establish how common mitochondrial abnormalities are in ME/CFS populations or whether the observed changes are primary causes or secondary effects of illness. The small sample size and lack of control group data limit generalizability, and modern techniques would provide more detailed mitochondrial analysis than polarography alone.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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