Tobback, Els, Hanoulle, Ignace, Mariman, An et al. · Acta clinica Belgica · 2016 · DOI
This study looked at how different factors—sleep quality, mood, and overall health—affect fatigue in ME/CFS patients. Researchers asked 167 patients to fill out questionnaires about their fatigue, sleep, personality traits, and quality of life. Surprisingly, they found that poor sleep directly harmed both physical and mental quality of life, but didn't necessarily increase fatigue scores on standard tests.
This study highlights an important gap in how we measure and understand fatigue in ME/CFS. It suggests that standard fatigue questionnaires may not capture all aspects of how sleep problems affect patients' lives, which could improve how researchers and clinicians assess treatment outcomes and disease mechanisms.
This cross-sectional study cannot establish causation—it shows associations only, not whether poor sleep causes reduced quality of life or vice versa. The findings do not prove that fatigue questionnaires are invalid, only that they may not fully capture the fatigue experience in CFS. The study cannot determine whether newer or different measurement tools would better reflect the true relationship between sleep and fatigue.
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
Tobback, Els, Hanoulle, Ignace, Mariman, An, Delesie, Liesbeth, Pevernagie, Dirk, & Vogelaers, Dirk (2016). Factors determining fatigue in the chronic fatigue syndrome: a path analysis.. Acta clinica Belgica. https://doi.org/10.1080/17843286.2016.1165396
BibTeX
@article{mecfsatlas-tobback-2016-factors-determining,
author = {Tobback, Els and Hanoulle, Ignace and Mariman, An and Delesie, Liesbeth and Pevernagie, Dirk and Vogelaers, Dirk},
title = {Factors determining fatigue in the chronic fatigue syndrome: a path analysis.},
journal = {Acta clinica Belgica},
year = {2016},
doi = {10.1080/17843286.2016.1165396},
note = {PubMed: 27143625},
url = {https://www.mecfsatlas.com/evidence/tobback-2016-factors-determining},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/tobback-2016-factors-determining
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