Ahmed, S A, Mewes, J C, Vrijhoef, Hjm · Journal of health psychology · 2020 · DOI
This review examined 18 previous studies that tested cognitive behavioural therapy (talk therapy focused on thoughts and behaviors) and graded exercise therapy (gradually increasing physical activity) for ME/CFS. The reviewers found that most of these studies had significant problems in how they were designed and conducted, which means we cannot be confident in their results. The review highlights that better, more carefully designed studies are needed with better ways of measuring improvements.
This study is important because it questions the strength of evidence supporting two widely-recommended treatments for ME/CFS. For patients, it validates concerns that existing research may not be robust enough to prove these therapies work. For researchers, it identifies critical gaps in study design that must be addressed to generate trustworthy evidence about what treatments actually help ME/CFS patients.
This systematic review does not prove that CBT or GET are ineffective—it only shows the studies testing them have serious design flaws. The review does not determine whether properly-designed studies would show these therapies work or don't work. It assesses methodological quality, not true treatment efficacy.
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
Ahmed, S A, Mewes, J C, & Vrijhoef, Hjm (2020). Assessment of the scientific rigour of randomized controlled trials on the effectiveness of cognitive behavioural therapy and graded exercise therapy for patients with myalgic encephalomyelitis/chronic fatigue syndrome: A systematic review.. Journal of health psychology. https://doi.org/10.1177/1359105319847261
BibTeX
@article{mecfsatlas-ahmed-2020-assessment-scientific,
author = {Ahmed, S A and Mewes, J C and Vrijhoef, Hjm},
title = {Assessment of the scientific rigour of randomized controlled trials on the effectiveness of cognitive behavioural therapy and graded exercise therapy for patients with myalgic encephalomyelitis/chronic fatigue syndrome: A systematic review.},
journal = {Journal of health psychology},
year = {2020},
doi = {10.1177/1359105319847261},
note = {PubMed: 31072121},
url = {https://www.mecfsatlas.com/evidence/ahmed-2020-assessment-scientific},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/ahmed-2020-assessment-scientific
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