Rayhan, Rakib U, Baraniuk, James N · Frontiers in neuroscience · 2021 · DOI
Researchers used brain imaging to look at what happens in ME/CFS patients' brains after exercise. They found that after submaximal exercise, a specific brain region (the anterior Default Mode Network) showed increased activity in ME/CFS patients but decreased activity in healthy controls. This brain pattern may help explain why ME/CFS patients experience symptom flare-ups after physical activity.
Identifying objective biomarkers of postexertional malaise is critical for ME/CFS diagnosis, as the condition is currently diagnosed clinically without validated biological tests. This finding could eventually lead to better recognition of the condition and improved understanding of why exercise worsens symptoms in some patients. Establishing disease-specific brain imaging patterns may also help distinguish ME/CFS from other fatiguing illnesses.
This study demonstrates a correlation between brain activation patterns and postexertional malaise but does not prove causation—the anterior DMN hyperactivation may be a consequence of symptom exacerbation rather than its cause. The study cannot establish whether this brain pattern is unique to ME/CFS, as comparisons to other fatiguing conditions (post-COVID fatigue, fibromyalgia, etc.) were not included. Results are limited to a small sample size and require replication before clinical application.
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
Rayhan, Rakib U & Baraniuk, James N (2021). Submaximal Exercise Provokes Increased Activation of the Anterior Default Mode Network During the Resting State as a Biomarker of Postexertional Malaise in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.. Frontiers in neuroscience. https://doi.org/10.3389/fnins.2021.748426
BibTeX
@article{mecfsatlas-rayhan-2021-submaximal-exercise,
author = {Rayhan, Rakib U and Baraniuk, James N},
title = {Submaximal Exercise Provokes Increased Activation of the Anterior Default Mode Network During the Resting State as a Biomarker of Postexertional Malaise in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.},
journal = {Frontiers in neuroscience},
year = {2021},
doi = {10.3389/fnins.2021.748426},
note = {PubMed: 34975370},
url = {https://www.mecfsatlas.com/evidence/rayhan-2021-submaximal-exercise},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/rayhan-2021-submaximal-exercise
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