Strahler, Jana, Fischer, Susanne, Nater, Urs M et al. · Biological psychology · 2013 · DOI
This study looked at how the body's stress hormones (norepinephrine and epinephrine) respond in ME/CFS patients compared to healthy people. Researchers tested 21 ME/CFS patients and 20 controls using exercise and a hormone-stimulation test, measuring stress hormones before and after. ME/CFS patients showed weaker hormone responses to exercise, particularly lower baseline levels and blunted epinephrine release, which could help explain why physical activity feels so exhausting.
This study provides biological evidence that ME/CFS involves dysfunction in the sympathetic nervous system's stress response, particularly during physical exertion. Understanding these hormonal abnormalities could help validate ME/CFS as a physiological condition and guide development of targeted treatments that address autonomic dysfunction.
This study does not prove that weak stress hormone responses *cause* ME/CFS symptoms—it shows an association. The small sample size (21 patients) limits confidence in the findings. It also does not explain why some patients have this hormonal pattern or whether correcting it would improve symptoms.
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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