E2 ModerateModerate confidencePEM unclearCross-SectionalPeer-reviewedReviewed
The Head-Up Tilt Table Test as a Measure of Autonomic Functioning among Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.
Jason, Leonard A, McGarrigle, William J, Vermeulen, Ruud C W · Journal of personalized medicine · 2024 · DOI
Quick Summary
This study tested 193 people with ME/CFS using a tilt table test to check if they had problems with their autonomic nervous system (the system that controls heart rate and blood pressure). About one in three participants showed signs of orthostatic intolerance—a condition where the body struggles to maintain proper blood pressure and heart rate when standing. People with these problems reported worse sleep, more severe post-exertional malaise (exhaustion after activity), and greater physical limitations.
Why It Matters
This study provides objective evidence that autonomic dysfunction is common in ME/CFS and correlates with more severe symptoms and functional limitations. Identifying autonomic problems through tilt table testing may help clinicians understand symptom patterns better and tailor treatment strategies for ME/CFS patients experiencing orthostatic intolerance.
Observed Findings
- 32.5% of ME/CFS patients tested positive for postural orthostatic tachycardia syndrome (POTS) or orthostatic hypotension (OH)
- Patients with orthostatic intolerance reported more severe sleep problems compared to those without
- Patients with orthostatic intolerance reported more severe post-exertional malaise
- Patients with orthostatic intolerance reported greater physical and health function limitations
Inferred Conclusions
- Autonomic dysfunction is prevalent in ME/CFS patients and may be an important contributor to symptom severity
- Orthostatic intolerance is associated with worse sleep quality and post-exertional malaise in ME/CFS
- Tilt table testing may be a useful clinical tool for identifying autonomic problems in ME/CFS populations
Remaining Questions
- Does orthostatic intolerance directly cause worse symptoms, or do they share a common underlying cause?
- How do orthostatic intolerance rates in this clinic sample compare to ME/CFS patients in other healthcare settings or geographic regions?
- Can treating orthostatic intolerance improve sleep quality, post-exertional malaise, and functional capacity in ME/CFS patients?
What This Study Does Not Prove
This cross-sectional study cannot prove that autonomic dysfunction causes the worse symptoms observed—only that they co-occur. It does not establish whether orthostatic intolerance is a primary driver of ME/CFS or a secondary consequence, nor does it prove these findings apply to all ME/CFS populations or those treated in different settings.
Tags
Symptom:Post-Exertional MalaiseUnrefreshing SleepOrthostatic IntoleranceFatigue
Method Flag:Weak Case DefinitionNo ControlsExploratory OnlyPEM Not Defined
Metadata
- DOI
- 10.3390/jpm14030238
- PMID
- 38540980
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
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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