Edwards, R H, Gibson, H, Clague, J E et al. · Ciba Foundation symposium · 1993 · DOI
Researchers examined muscle tissue from 108 ME/CFS patients and 22 healthy people using microscopes to look for structural damage, and tested muscle strength before and after exercise. They found no consistent muscle damage that explained fatigue symptoms, and muscle strength worked normally even after exercise. The study suggests ME/CFS is not caused by a primary muscle disease.
This study addresses a fundamental question about ME/CFS pathophysiology—whether muscle tissue damage explains the disease. By examining a relatively large cohort with both microscopic and physiological methods, it provides evidence against a primary myopathic mechanism, which redirects research toward other biological systems and psychological factors.
This study does not prove that psychological or psychiatric factors cause ME/CFS—only that muscle pathology alone does not explain it. It also does not rule out functional or biochemical muscle dysfunction that might not be visible under microscopy, nor does it address whether post-exertional malaise involves mechanisms outside muscle tissue. The cross-sectional design cannot establish causation or temporal relationships.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Edwards, R H, Gibson, H, Clague, J E, & Helliwell, T (1993). Muscle histopathology and physiology in chronic fatigue syndrome.. Ciba Foundation symposium. https://doi.org/10.1002/9780470514382.ch7
BibTeX
@article{mecfsatlas-edwards-1993-muscle-histopathology,
author = {Edwards, R H and Gibson, H and Clague, J E and Helliwell, T},
title = {Muscle histopathology and physiology in chronic fatigue syndrome.},
journal = {Ciba Foundation symposium},
year = {1993},
doi = {10.1002/9780470514382.ch7},
note = {PubMed: 8491096},
url = {https://www.mecfsatlas.com/evidence/edwards-1993-muscle-histopathology},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/edwards-1993-muscle-histopathology
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