Stahl, D, Rimes, K A, Chalder, T · Psychological medicine · 2014 · DOI
This study looked at how cognitive behavioral therapy (CBT) works for ME/CFS by following 389 patients over a year. The researchers found that when patients reduced their avoidance behaviors, their fearful beliefs about activity decreased, which in turn helped reduce fatigue and improve their ability to engage socially. This suggests CBT's benefits come partly from changing how people think about and approach activity.
Understanding *how* CBT works—not just that it works—helps clinicians refine treatment and helps patients understand what changes to target during therapy. This study provides mechanistic evidence supporting the cognitive-behavioral model of CFS, potentially improving treatment outcomes and guiding personalized interventions.
This study does not prove that fear-avoidance beliefs *cause* fatigue worsening; it shows an association across time points. It does not establish whether CBT is superior to other treatments, nor does it address mechanisms in patients who do not respond to CBT. The temporal sequence suggests mediation but cannot definitively prove causation.
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
Stahl, D, Rimes, K A, & Chalder, T (2014). Mechanisms of change underlying the efficacy of cognitive behaviour therapy for chronic fatigue syndrome in a specialist clinic: a mediation analysis.. Psychological medicine. https://doi.org/10.1017/S0033291713002006
BibTeX
@article{mecfsatlas-stahl-2014-mechanisms-change,
author = {Stahl, D and Rimes, K A and Chalder, T},
title = {Mechanisms of change underlying the efficacy of cognitive behaviour therapy for chronic fatigue syndrome in a specialist clinic: a mediation analysis.},
journal = {Psychological medicine},
year = {2014},
doi = {10.1017/S0033291713002006},
note = {PubMed: 23931831},
url = {https://www.mecfsatlas.com/evidence/stahl-2014-mechanisms-change},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-25. https://www.mecfsatlas.com/evidence/stahl-2014-mechanisms-change
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