Korenromp, Ingrid H E, Heijnen, Cobi J, Vogels, Oscar J M et al. · Chest · 2011 · DOI
This study looked at 75 people with sarcoidosis (an inflammatory disease) whose disease was no longer active, but who still felt extremely tired. Nearly half of these fatigued patients met the diagnostic criteria for chronic fatigue syndrome (CFS). The researchers found that fatigue was linked to depression, anxiety, reduced quality of life, lower physical activity, and muscle weakness—even though their sarcoidosis was considered under control.
This study provides important evidence that severe, CFS-like fatigue can persist after apparent disease remission in sarcoidosis, suggesting parallels between post-inflammatory fatigue syndromes and ME/CFS. The inclusion of objective measures (accelerometry, muscle strength testing) alongside subjective symptoms strengthens the characterization of persistent fatigue and may inform understanding of fatigue mechanisms in ME/CFS.
This study does not prove causation—it only demonstrates associations between fatigue and depression, anxiety, reduced activity, and weakness. The cross-sectional design cannot determine whether depression causes fatigue, fatigue causes depression, or both are secondary to a common underlying mechanism. The study also does not address whether these patients had post-exertional malaise or other ME/CFS-specific criteria beyond the general CFS definition.
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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