Rowbottom, D G, Keast, D, Green, S et al. · Medicine and science in sports and exercise · 1998 · DOI
Researchers studied an elite cyclist who developed ME/CFS and tested his fitness before, during, and after his illness. His oxygen capacity and exercise performance dropped significantly during illness, but surprisingly remained low even after he felt clinically better. The authors suggest these fitness losses were due to prolonged inactivity from being sick rather than damage to his muscles' ability to use oxygen.
This study provides objective physiological data from a uniquely valuable resource—a highly trained athlete with pre-illness baseline testing—showing that ME/CFS-related performance decline persists even after clinical improvement. It challenges assumptions about muscle pathology in ME/CFS and suggests the fatigue mechanism may involve central nervous system dysfunction rather than peripheral metabolic damage.
This single-case study cannot establish causation or generalize findings to the broader ME/CFS population. It does not prove that all ME/CFS patients experience detraining-type changes rather than metabolic impairment, nor does it definitively establish the mechanism of fatigue perception in ME/CFS. The study design cannot rule out other explanations for the persistent performance deficits.
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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