Pardaens, K, Haagdorens, L, Van Wambeke, P et al. · Clinical rehabilitation · 2006 · DOI
This study tested whether a 6-month rehabilitation program combining cognitive therapy and graded exercise improved ME/CFS patients' quality of life and physical fitness. Patients reported significant improvements in how they felt and functioned in daily life, but their measured physical capacity (like strength and endurance on a bike test) only improved modestly. Importantly, feeling better didn't require becoming noticeably fitter—especially for patients who started out less fit.
This study challenges the assumption that physical improvements (fitness gains) are necessary for ME/CFS patients to feel better, which has important implications for how treatment success is measured and how rehabilitation programs are designed. It suggests that quality-of-life improvements may be achieved through cognitive and adaptive strategies independent of measured exercise capacity gains, potentially reducing pressure on patients to focus solely on fitness metrics.
This study does not prove that graded exercise therapy is universally safe or effective for all ME/CFS patients, as it lacked a control group and did not systematically track adverse events or post-exertional malaise. The weak correlation between fitness gains and well-being improvements does not establish causation in either direction, nor does it explain the mechanisms underlying reported improvements. Results are limited to women and may not generalize to men or more severely affected patients.
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
Pardaens, K, Haagdorens, L, Van Wambeke, P, Van den Broeck, A, & Van Houdenhove, B (2006). How relevant are exercise capacity measures for evaluating treatment effects in chronic fatigue syndrome? Results from a prospective, multidisciplinary outcome study.. Clinical rehabilitation. https://doi.org/10.1191/0269215506cr914oa
BibTeX
@article{mecfsatlas-pardaens-2006-how-relevant,
author = {Pardaens, K and Haagdorens, L and Van Wambeke, P and Van den Broeck, A and Van Houdenhove, B},
title = {How relevant are exercise capacity measures for evaluating treatment effects in chronic fatigue syndrome? Results from a prospective, multidisciplinary outcome study.},
journal = {Clinical rehabilitation},
year = {2006},
doi = {10.1191/0269215506cr914oa},
note = {PubMed: 16502751},
url = {https://www.mecfsatlas.com/evidence/pardaens-2006-how-relevant},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/pardaens-2006-how-relevant
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