Baraniuk, James N, Amar, Alison, Pepermitwala, Haris et al. · Brain sciences · 2022 · DOI
This study used brain imaging to examine how exercise affects people with ME/CFS and Gulf War Illness. Researchers found that after exercise, the brains of ME/CFS patients showed increased activity in areas that control alertness, mood, pain, and sleep, while Gulf War Illness patients showed the opposite pattern (decreased activity). These findings suggest that ME/CFS and Gulf War Illness affect the brain differently, which may explain why exercise can make symptoms worse in ME/CFS patients.
Understanding the biological mechanisms behind postexertional malaise is critical for ME/CFS patients, as it validates that their symptom worsening after exercise has a measurable neurological basis. This finding may eventually lead to better diagnostic markers and targeted treatments that address the specific brain dysfunction in ME/CFS, potentially distinguishing it from other illnesses with overlapping symptoms.
This study does not prove that midbrain activation changes directly cause postexertional malaise symptoms; it only shows correlation. It also does not establish whether these brain activation patterns are a primary cause of ME/CFS or a consequence of the disease. Additionally, the study uses a small exercise challenge and does not prove these findings apply to more intense exertion that typically triggers PEM in real-world settings.
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
Baraniuk, James N, Amar, Alison, Pepermitwala, Haris, & Washington, Stuart D (2022). Differential Effects of Exercise on fMRI of the Midbrain Ascending Arousal Network Nuclei in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and Gulf War Illness (GWI) in a Model of Postexertional Malaise (PEM).. Brain sciences. https://doi.org/10.3390/brainsci12010078
BibTeX
@article{mecfsatlas-baraniuk-2022-differential-effects,
author = {Baraniuk, James N and Amar, Alison and Pepermitwala, Haris and Washington, Stuart D},
title = {Differential Effects of Exercise on fMRI of the Midbrain Ascending Arousal Network Nuclei in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and Gulf War Illness (GWI) in a Model of Postexertional Malaise (PEM).},
journal = {Brain sciences},
year = {2022},
doi = {10.3390/brainsci12010078},
note = {PubMed: 35053821},
url = {https://www.mecfsatlas.com/evidence/baraniuk-2022-differential-effects},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/baraniuk-2022-differential-effects
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