Joustra, Monica L, Zijlema, Wilma L, Rosmalen, Judith G M et al. · Pain research & management · 2018 · DOI
This study looked at how physical activity and sleep relate to symptom severity in ME/CFS and fibromyalgia by comparing nearly 91,000 people from a large population study. Patients with ME/CFS and fibromyalgia were less active and slept longer than healthy controls. Interestingly, both too little and too much physical activity or sleep were linked to worse symptoms, suggesting that finding the right balance is important for managing these conditions.
This study challenges the assumption that more physical activity is always better for ME/CFS and fibromyalgia patients, suggesting instead a non-linear relationship where both extremes of activity and sleep are harmful. The large population-based sample provides robust evidence that personalized, patient-specific treatment approaches may be necessary rather than one-size-fits-all recommendations. Understanding these associations is crucial for developing safe rehabilitation and activity management strategies.
This study cannot establish causality—it is unclear whether low activity causes worse symptoms, worse symptoms cause reduced activity, or both are driven by underlying disease severity. The cross-sectional design prevents determination of the optimal activity or sleep duration for individual patients. The questionnaire-based assessment may not accurately capture activity patterns in ME/CFS, where post-exertional malaise can affect energy on subsequent days in ways standard surveys may miss.
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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