E2 ModerateModerate confidencePEM not requiredObservationalPeer-reviewedReviewed
Cognitive behaviour group therapy for chronic fatigue syndrome: a non-randomised waiting list controlled study.
Bazelmans, E, Prins, J B, Lulofs, R et al. · Psychotherapy and psychosomatics · 2005 · DOI
Quick Summary
This study tested whether cognitive behavior group therapy (CBGT)—a type of talk therapy done in groups—could help people with ME/CFS feel less fatigued and function better. Researchers compared 31 patients who received 12 sessions of CBGT over 6 months to 36 patients on a waiting list. They found the therapy had a modest benefit for fatigue but unexpectedly made functional problems slightly worse.
Why It Matters
Understanding which psychological interventions work for ME/CFS and for whom is crucial for developing better treatment options. This study highlights that group-based cognitive behavioral approaches may help some patients but suggests that standard protocols need adaptation for ME/CFS, particularly regarding activity pacing and therapist training.
Observed Findings
- CBGT produced a moderate effect size improvement in fatigue severity compared to waiting list control.
- Functional impairment measured by Sickness Impact Profile worsened unexpectedly in the CBGT group relative to controls.
- Patients with lower baseline symptom burden were significantly more likely to show improvement after CBGT.
- Therapists delivering the intervention had limited prior experience with CBT/CBGT specifically adapted for CFS.
Inferred Conclusions
- Standard CBGT protocols designed for other conditions may require substantial modification when applied to ME/CFS populations.
- Excessive emphasis on rest and relaxation within CBGT may be counterproductive and require rebalancing with appropriate activity guidance.
- Selection of patients with milder baseline symptoms and use of CFS-experienced therapists may improve treatment outcomes in future trials.
Remaining Questions
- What specific protocol modifications would optimise CBGT efficacy in ME/CFS patients with varying disease severity?
- Why did functional impairment worsen in the treatment group, and does this reflect genuine deterioration or measurement artefact?
- How would CBGT outcomes differ if delivered by therapists with specialised training in ME/CFS management?
What This Study Does Not Prove
This study does not prove that CBGT is an effective standalone treatment for ME/CFS, as it lacked randomisation and showed mixed results with unexpected deterioration in functional outcomes. The moderate effect sizes and lack of rigorous blinding mean we cannot confidently distinguish between genuine therapeutic benefit and placebo/natural recovery effects. The findings cannot be generalised to selected patient populations or to CBGT delivered by experienced CFS therapists.
Tags
Symptom:FatigueCognitive Dysfunction
Method Flag:Weak Case DefinitionSmall SampleMixed CohortNo ControlsExploratory Only
Metadata
- DOI
- 10.1159/000085145
- PMID
- 15947511
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
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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