POTS versus deconditioning: the same or different?
Joyner, Michael J, Masuki, Shizue · Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2008 · DOI
Quick Summary
This review article compares POTS (a condition where heart rate and blood pressure drop abnormally when standing) with the physical deconditioning that happens after long bed rest or spaceflight. The authors suggest that both conditions may share similar causes and that carefully structured exercise training might help patients with POTS, ME/CFS, and fibromyalgia, while acknowledging the medical community must remain empathetic to patients with these complex conditions.
Why It Matters
This study directly addresses a central debate in ME/CFS care: the role of deconditioning versus disease-specific dysfunction, and whether exercise is universally beneficial or potentially harmful. Understanding how POTS, ME/CFS, and fibromyalgia relate mechanistically is crucial for developing appropriate treatment strategies and avoiding harm from ill-fitting exercise prescriptions.
Observed Findings
Physiological responses to orthostatic stress in POTS patients show similarities to responses seen in normal subjects after prolonged bedrest and spaceflight.
Deconditioning is proposed as a key contributor to symptomatology in POTS, ME/CFS, and fibromyalgia.
Somatic hypervigilance is proposed to work in conjunction with deconditioning to explain patient complaints.
Endurance exercise training has been suggested as a potential therapeutic approach across these three conditions.
Inferred Conclusions
Physical deconditioning plays a significant role in the pathophysiology of POTS and may contribute similarly to ME/CFS and fibromyalgia.
Systematic endurance exercise training may ameliorate symptoms in patients with POTS, ME/CFS, and fibromyalgia.
Medical professionals should balance empathy with measured encouragement of appropriate physical activity in these patient populations.
The deconditioning-plus-hypervigilance model does not fully explain all features of these conditions and additional mechanisms require investigation.
Remaining Questions
What initiating events trigger the transition from normal physiology to chronic deconditioning in POTS and ME/CFS?
How can clinicians distinguish between deconditioning-driven symptoms and disease-specific symptoms requiring different treatment approaches?
What This Study Does Not Prove
This review does not prove that deconditioning is the primary cause of ME/CFS or POTS—it only proposes parallels and raises hypotheses. It does not establish that exercise training is safe or effective for all ME/CFS patients, nor does it address potential harm from post-exertional malaise (PEM) in patients with ME/CFS. The article acknowledges its own incompleteness by noting what this model fails to explain.
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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