Weinstein, Ali A, Drinkard, Bart M, Diao, Guoqing et al. · PM & R : the journal of injury, function, and rehabilitation · 2009 · DOI
This study looked at whether feeling tired (fatigue) matches up with how well the body can use oxygen during exercise in people with three different conditions: rheumatoid arthritis, polymyositis, and ME/CFS. Researchers tested 29 patients total and found that people who reported doing more physical activity had better oxygen capacity, but surprisingly, how fatigued people *said* they felt didn't match their actual aerobic fitness levels.
This study is important because it challenges the assumption that self-reported fatigue directly reflects aerobic fitness problems in ME/CFS. Understanding that fatigue perception and measured aerobic capacity are distinct measures helps clinicians and researchers better understand what patients are experiencing and may guide how fatigue is assessed in clinical trials and patient care.
This study cannot establish causation or explain *why* fatigue perception and aerobic capacity are disconnected. The small sample size (10 CFS patients) and cross-sectional design limit generalizability. The study does not prove that ME/CFS fatigue is primarily psychological or perception-based—only that self-reported fatigue scores don't correlate with one specific measure of aerobic capacity.
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
Weinstein, Ali A, Drinkard, Bart M, Diao, Guoqing, Furst, Gloria, Dale, Janet K, Straus, Stephen E, et al. (2009). Exploratory analysis of the relationships between aerobic capacity and self-reported fatigue in patients with rheumatoid arthritis, polymyositis, and chronic fatigue syndrome.. PM & R : the journal of injury, function, and rehabilitation. https://doi.org/10.1016/j.pmrj.2009.04.007
BibTeX
@article{mecfsatlas-weinstein-2009-exploratory-analysis,
author = {Weinstein, Ali A and Drinkard, Bart M and Diao, Guoqing and Furst, Gloria and Dale, Janet K and Straus, Stephen E and Gerber, Lynn H},
title = {Exploratory analysis of the relationships between aerobic capacity and self-reported fatigue in patients with rheumatoid arthritis, polymyositis, and chronic fatigue syndrome.},
journal = {PM & R : the journal of injury, function, and rehabilitation},
year = {2009},
doi = {10.1016/j.pmrj.2009.04.007},
note = {PubMed: 19627955},
url = {https://www.mecfsatlas.com/evidence/weinstein-2009-exploratory-analysis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/weinstein-2009-exploratory-analysis
Contribute
Private, reviewed by a human. Not a public comment thread.