Lange, Gudrun, Lin, Jin-Mann S, Chen, Yang et al. · Frontiers in neuroscience · 2024 · DOI
This study tested cognitive function (thinking and memory skills) in 261 people with ME/CFS and 165 healthy people using a computer-based screening test. Researchers found that people with ME/CFS process information more slowly than healthy people, but their accuracy was similar. Importantly, a single intense exercise test did not make cognitive problems worse, though the full clinic visit itself did cause some cognitive decline in both groups.
Cognitive dysfunction is a hallmark and often disabling symptom of ME/CFS, yet objective biomarkers are lacking. This study provides evidence that processing speed deficits are measurable and reproducible in ME/CFS, supporting the development of brief, home-based cognitive screening tools. Understanding whether specific activities worsen cognition helps clinicians and patients make informed decisions about activity management and pacing.
This study does not prove that exercise causes long-term cognitive decline in ME/CFS patients, nor does it establish why processing speed is slower—only that the difference exists. The lack of accuracy differences suggests cognition may be preserved but efficiency is compromised, but the study cannot explain the biological mechanism. Additionally, findings from clinic-based testing may not fully represent real-world cognitive function or patient-reported 'brain fog.'
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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