Bruno, R L, Creange, S J, Frick, N M · The American journal of medicine · 1998 · DOI
This review examines similarities between fatigue experienced by polio survivors and people with ME/CFS, suggesting they may share common underlying brain problems. Both conditions involve difficulty concentrating, staying awake, and severe fatigue. The researchers propose that reduced dopamine (a brain chemical) and problems with specific brain systems might explain fatigue in both diseases.
This study is significant because it proposes a biological mechanism linking viral infections to persistent fatigue and cognitive dysfunction in ME/CFS, moving beyond dismissing symptoms as purely psychological. Identifying shared pathophysiology between post-polio fatigue and ME/CFS strengthens the case for recognizing ME/CFS as an organic neurological condition and suggests potential therapeutic targets.
This review does not prove causation—it identifies associations and proposes a mechanism without new experimental evidence. It does not establish that dopamine depletion is definitively responsible for ME/CFS fatigue, nor does it prove that all post-viral fatigue syndromes share identical mechanisms. The proposed Brain Fatigue Generator Model remains a hypothesis requiring empirical validation.
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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