Paul, Lorna, Rafferty, Danny, Marshal, Rebecca · Disability and rehabilitation · 2009 · DOI
This study compared how much energy people with ME/CFS use when walking compared to healthy people. Researchers found that people with ME/CFS walk more slowly and use more energy per unit of distance covered, meaning their bodies have to work harder to move the same distance as healthy people.
This study provides objective physiological evidence that ME/CFS affects how efficiently the body uses energy during basic physical activity. Understanding that walking requires disproportionate energy expenditure in ME/CFS helps validate the experience of fatigue and provides measurable data supporting the biological basis of the condition.
This study does not explain why people with ME/CFS have higher physiological costs of walking—only that they do. It does not establish causation for this energy inefficiency or identify whether it results from muscle abnormalities, neurological factors, mitochondrial dysfunction, or other mechanisms. The cross-sectional design cannot determine whether inefficient gait is a cause or consequence of ME/CFS.
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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