Evering, Richard M H, Tönis, Thijs M, Vollenbroek-Hutten, Miriam M R · Journal of psychosomatic research · 2011 · DOI
This study looked at how people with ME/CFS move and exercise throughout the day compared to healthy people, using motion-tracking devices. Researchers found that ME/CFS patients are less active in the afternoon and evening, do fewer intense activities, and experience more unpredictable activity patterns day-to-day. Interestingly, ME/CFS patients were also more aware of their activity levels than healthy controls.
Understanding how ME/CFS affects real-world activity patterns helps explain why patients experience worsening fatigue and may guide development of better rehabilitation strategies. The finding that activity variability differs from healthy controls suggests ME/CFS involves disrupted daily functioning that cannot be attributed solely to reduced overall activity.
This study does not establish whether irregular activity patterns cause fatigue severity or result from it—the relationship could be bidirectional. It also does not prove that correcting activity patterns will improve outcomes, nor does it explain the underlying biological mechanisms driving these behavioral changes.
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
Evering, Richard M H, Tönis, Thijs M, & Vollenbroek-Hutten, Miriam M R (2011). Deviations in daily physical activity patterns in patients with the chronic fatigue syndrome: a case control study.. Journal of psychosomatic research. https://doi.org/10.1016/j.jpsychores.2011.04.004
BibTeX
@article{mecfsatlas-evering-2011-deviations-daily,
author = {Evering, Richard M H and Tönis, Thijs M and Vollenbroek-Hutten, Miriam M R},
title = {Deviations in daily physical activity patterns in patients with the chronic fatigue syndrome: a case control study.},
journal = {Journal of psychosomatic research},
year = {2011},
doi = {10.1016/j.jpsychores.2011.04.004},
note = {PubMed: 21843746},
url = {https://www.mecfsatlas.com/evidence/evering-2011-deviations-daily},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/evering-2011-deviations-daily
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