Sympathetic nervous system function in fibromyalgia.
Petzke, F, Clauw, D J · Current rheumatology reports · 2000 · DOI
Quick Summary
This review examines how the sympathetic nervous system—the part that controls your 'fight or flight' stress response—works differently in fibromyalgia patients. Researchers looked at various ways to measure sympathetic function, including heart rate changes, stress hormone levels, and physical responses to stress. The authors also compared findings in fibromyalgia to similar conditions like ME/CFS, irritable bowel syndrome, and migraine to identify common patterns.
Why It Matters
This review is significant because autonomic nervous system dysfunction is increasingly recognized as a core pathophysiological feature in ME/CFS, and comparisons with fibromyalgia provide insight into shared mechanisms. Understanding how to properly measure sympathetic function could improve diagnosis and monitoring in ME/CFS, where autonomic symptoms (orthostatic intolerance, heart rate abnormalities, temperature dysregulation) are clinically prominent.
Observed Findings
Studies documented measurable differences in heart rate variability in fibromyalgia compared to controls
Biochemical markers of sympathetic activation showed alterations in fibromyalgia populations
Psychophysical responses to various stressors demonstrated abnormal patterns in fibromyalgia
Autonomic dysfunction patterns showed overlap between fibromyalgia, ME/CFS, IBS, and migraine
Multiple assessment methods yielded inconsistent results across different research groups
Inferred Conclusions
The sympathetic nervous system demonstrates measurable dysfunction in fibromyalgia and related conditions
Standardized assessment methods are needed to improve consistency and comparability across studies
Common autonomic dysregulation patterns suggest potential shared pathophysiological mechanisms across fibromyalgia, ME/CFS, IBS, and migraine
Heart rate variability, biochemical assays, and stress-response testing are promising tools for future investigation
Remaining Questions
Which specific sympathetic assessment methods are most reliable and clinically useful for routine evaluation?
What This Study Does Not Prove
This review does not establish cause-and-effect relationships between sympathetic dysfunction and symptom development, nor does it prove that fibromyalgia and ME/CFS share identical pathophysiology. As a literature review without new experimental data, it cannot validate any specific assessment method or determine which sympathetic abnormalities are primary versus secondary consequences of chronic illness.
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 →
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