Jammes, Y, Steinberg, J G, Mambrini, O et al. · Journal of internal medicine · 2005 · DOI
This study examined how muscles respond to exercise in people with ME/CFS compared to healthy people. Researchers had patients cycle at increasing intensities while measuring oxygen use, heart rate, muscle electrical signals, and markers of cellular stress. They found that ME/CFS patients showed increased oxidative stress (cellular damage) and abnormal muscle electrical activity during and after exercise, which may explain exercise-related pain and exhaustion.
This study provides objective physiological evidence for muscle dysfunction in ME/CFS, identifying specific markers (oxidative stress and abnormal muscle electrical activity) that correlate with patient-reported symptoms. These findings support the biological basis of post-exertional malaise and may guide future therapeutic interventions targeting oxidative stress or muscle membrane dysfunction.
This study does not prove that oxidative stress is the primary cause of ME/CFS, only that it is elevated during exercise in this cohort. It does not establish whether these findings are specific to ME/CFS or occur in other conditions causing post-exertional exhaustion. The cross-sectional design cannot determine if oxidative stress precedes symptom development or results from it.
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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