Comparison of adaptive pacing therapy, cognitive behaviour therapy, graded exercise therapy, and specialist medical care for chronic fatigue syndrome (PACE): a randomised trial. — CFSMEATLAS
Comparison of adaptive pacing therapy, cognitive behaviour therapy, graded exercise therapy, and specialist medical care for chronic fatigue syndrome (PACE): a randomised trial.
White, P D, Goldsmith, K A, Johnson, A L et al. · Lancet (London, England) · 2011 · DOI
Quick Summary
This study compared four treatment approaches for ME/CFS: specialist medical care alone, specialist medical care plus adaptive pacing therapy (APT), cognitive behaviour therapy (CBT), or graded exercise therapy (GET). The researchers found that CBT and GET, when added to standard medical care, helped reduce fatigue and improve physical function over 52 weeks. Adaptive pacing therapy did not show additional benefits compared to medical care alone. All treatments were considered safe based on the serious adverse events recorded.
Why It Matters
This is a landmark study that directly addressed patient concerns about treatment safety and effectiveness by evaluating four different approaches in a large randomised trial. The findings have influenced clinical guidelines and treatment recommendations internationally, making it important for patients and researchers to understand both what it showed and its limitations. The study's transparent examination of safety data in response to patient advocacy groups represents an important dialogue between research and the patient community.
Observed Findings
CBT was associated with 3.4-point lower fatigue scores compared to SMC alone (p=0.0001) and 7.1-point higher physical function scores (p=0.0068).
GET was associated with 3.2-point lower fatigue scores compared to SMC alone (p=0.0003) and 9.4-point higher physical function scores (p=0.0005).
APT did not demonstrate significant improvements in fatigue (0.7 points; p=0.38) or physical function (3.4 points; p=0.18) compared to SMC alone.
Serious adverse reactions were rare and similar across all groups: APT 1% (n=2), CBT 2% (n=3), GET 1% (n=2), SMC alone 1% (n=2).
Inferred Conclusions
CBT and GET can be safely added to specialist medical care and produce moderate improvements in fatigue and physical function for ME/CFS.
APT is not an effective addition to specialist medical care for ME/CFS outcomes.
The four treatments tested carry low rates of serious adverse reactions when properly delivered in a specialist setting.
Remaining Questions
Why did some patients report that CBT and GET were harmful when serious adverse reaction rates were low, and how should patient-reported worsening be distinguished from clinical adverse events?
Do improvements in fatigue and physical function scores reflect genuine physiological changes, changes in symptom perception, or changes in illness behaviour and activity patterns?
What This Study Does Not Prove
This study does not prove that CBT and GET are appropriate or safe for all ME/CFS patients, as it excluded individuals with the most severe illness and did not follow participants long-term beyond 52 weeks to assess durability or delayed harms. The use of Oxford criteria (which has broader diagnostic scope) rather than stricter international criteria for ME/CFS, combined with unmasked participant reporting of subjective outcomes, introduces potential bias. The study also does not establish whether improvements reflect physiological recovery or changes in symptom perception and reporting.
Tags
Symptom:Fatigue
Method Flag:PEM Not DefinedWeak Case DefinitionMixed Cohort