Papadopoulos, Andrew, Ebrecht, Marcel, Roberts, Amanda D L et al. · Journal of affective disorders · 2009 · DOI
This study looked at how the body's stress hormone system works in ME/CFS patients. Researchers gave a small dose of a synthetic hormone called dexamethasone to 18 ME/CFS patients and 20 healthy people, then measured how much their natural stress hormone (cortisol) decreased in response. Interestingly, ME/CFS patients who also had depression showed a larger drop in cortisol than healthy controls, suggesting their feedback system may be working overtime.
Understanding the cortisol feedback system in ME/CFS may help explain why this disease causes such profound fatigue and why some patients have comorbid depression. This research provides insight into whether abnormal stress hormone regulation contributes to ME/CFS symptoms and could eventually lead to better-targeted treatments.
This study does not prove that enhanced cortisol feedback causes ME/CFS or that it is present in all ME/CFS patients—findings were limited to the comorbid depression subgroup. The elevated basal cortisol in this sample differs from most published research, so results may not generalize to the broader ME/CFS population. The study also could not fully assess the complete feedback system, as it only measured glucocorticoid feedback and not mineralocorticoid feedback.
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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