Solomon-Moore, Emma, Jago, Russell, Beasant, Lucy et al. · BMJ paediatrics open · 2019 · DOI
This study looked at how much physical activity children and teenagers with mild-to-moderate ME/CFS actually do each day using movement trackers. Most young people with ME/CFS were doing much less activity than health guidelines recommend, but the researchers found three different activity groups: some were more active, some did light activity, and some were mostly inactive. Interestingly, those doing some light activity felt they could function better and had less fatigue, though those doing more activity sometimes reported more anxiety.
Many ME/CFS management approaches have traditionally recommended increasing activity, but this study provides real-world evidence that children with ME/CFS vary widely in their baseline activity patterns and may respond differently to activity changes. Understanding these distinct activity phenotypes helps clinicians recognize that one-size-fits-all activity recommendations may not be appropriate and that some young people with ME/CFS experience worsening anxiety with increased activity, suggesting the need for more personalized, cautious approaches.
This cross-sectional study cannot prove that physical activity patterns cause differences in fatigue, function, or anxiety—only that they are associated. The study does not establish whether increased activity is safe or beneficial long-term for children with ME/CFS, and the finding that higher activity was associated with greater anxiety may reflect reverse causation (anxious patients self-limiting activity) rather than activity causing anxiety. The sample is limited to mild-to-moderate cases, so findings may not apply to severe ME/CFS.
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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