Mateo, Lariel J, Chu, Lily, Stevens, Staci et al. · Work (Reading, Mass.) · 2020 · DOI
This study looked at how ME/CFS patients and healthy people felt after doing a hard exercise test. ME/CFS patients experienced many more symptoms afterward—an average of 14 different types—compared to healthy people who reported only 4. Importantly, ME/CFS patients continued having symptoms for up to a week after exercise, while healthy controls had none. The most common symptoms were fatigue, brain fog, and sleep problems.
This study provides objective evidence that post-exertional malaise is a distinctive feature of ME/CFS that clearly separates patients from healthy individuals, supporting its use as a diagnostic criterion. Understanding the specific pattern and duration of post-exertional symptoms may help clinicians better recognize and diagnose ME/CFS, and provides a foundation for investigating the underlying biological mechanisms causing this abnormal exercise response.
This study does not establish what causes the prolonged symptom response in ME/CFS or identify the underlying biological pathways involved. The cross-sectional design with a small control group cannot determine whether the exaggerated response is due to immune dysfunction, mitochondrial issues, autonomic problems, or other mechanisms. Additionally, relying on self-reported open-ended responses rather than objective biomarkers means we cannot confirm whether the reported symptoms reflect measurable physiological 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
Mateo, Lariel J, Chu, Lily, Stevens, Staci, Stevens, Jared, Snell, Christopher R, Davenport, Todd, et al. (2020). Post-exertional symptoms distinguish Myalgic Encephalomyelitis/Chronic Fatigue Syndrome subjects from healthy controls.. Work (Reading, Mass.). https://doi.org/10.3233/WOR-203168
BibTeX
@article{mecfsatlas-mateo-2020-post-exertional,
author = {Mateo, Lariel J and Chu, Lily and Stevens, Staci and Stevens, Jared and Snell, Christopher R and Davenport, Todd and VanNess, J Mark},
title = {Post-exertional symptoms distinguish Myalgic Encephalomyelitis/Chronic Fatigue Syndrome subjects from healthy controls.},
journal = {Work (Reading, Mass.)},
year = {2020},
doi = {10.3233/WOR-203168},
note = {PubMed: 32568143},
url = {https://www.mecfsatlas.com/evidence/mateo-2020-post-exertional},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/mateo-2020-post-exertional
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