Jin et al. (2026)
- Authors: Jiao Hong Jin, Yi An, Wei Jing Hunag, Tingting Luo, Xi Wu
- Institutes: Chengdu University of Traditional Chinese Medicine, Chengdu, China, The First People’s Hospital of Zunyi, Zunyi, China
- Publisher: Frontiers in Immunology
- Link: DOI
Summary
This review provides a comprehensive framework explaining how physical or cognitive activity triggers the debilitating symptom flare known as Post-exertional Malaise. By linking metabolic failure at the cellular level to immune system overactivation and brain inflammation, it validates the experience of patients and underscores the biological necessity of pacing. This integrative model helps shift the focus toward multi-system treatments that address both energy production and inflammation simultaneously.
What was researched?
The study conducted an integrative review of the biological mechanisms behind Post-exertional Malaise (PEM) in conditions like Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Long COVID.
Why was it researched?
PEM is a complex and defining symptom of these conditions, yet the interaction between metabolic, immune, and neurological systems required a unified theoretical model to explain its multi-systemic nature.
How was it researched?
Researchers synthesized current scientific literature to develop a ‘metabolism-immune-neuro’ interaction model, mapping how local metabolic stress transitions into systemic and central nervous system dysfunction.
What has been found?
The analysis suggests that PEM begins with mitochondrial dysfunction, where exertion causes energy depletion and the accumulation of reactive oxygen species. These stressors act as danger signals that activate the NLRP3 inflammasome, leading to a surge of inflammatory cytokines in the bloodstream. This peripheral inflammation then crosses into the brain, triggering neuroinflammation and altering how the insular cortex processes fatigue and pain.
Discussion
The proposed ‘energy exhaustion-inflammation amplification’ loop creates a self-perpetuating cycle that explains why recovery from minor activity is severely delayed. This model suggests that the brain’s internal monitoring systems are fundamentally recalibrated by persistent inflammatory signals.
Conclusion & Future Work
The researchers conclude that PEM is a multi-system failure rather than a single-organ issue. They advocate for collaborative, multi-target interventions that can disrupt this pathological cycle across metabolic and neurological pathways.