Yoshiuchi, Kazuhiro, Quigley, Karen S, Ohashi, Kyoko et al. · Autonomic neuroscience : basic & clinical · 2004 · DOI
This study looked at how the nervous system that controls heart rate and blood pressure responds when people stand up from lying down. Researchers tested people with ME/CFS (with and without a condition called POTS), and compared them to healthy volunteers. They found that even ME/CFS patients without POTS showed subtle differences in how their heart rate changed during the standing test, suggesting their autonomic nervous system may not work quite normally.
This study helps explain why ME/CFS patients often experience problems with standing and dizziness by examining how their autonomic nervous system responds to postural changes. By separating CFS patients with and without POTS, it provides evidence that autonomic problems in ME/CFS may exist independently of POTS, suggesting multiple pathways to autonomic dysfunction in this condition.
This study does not prove that autonomic nervous system changes cause ME/CFS symptoms, nor does it establish whether the observed differences are specific to ME/CFS or represent a biomarker useful for diagnosis. Cross-sectional design means causality cannot be determined, and the small sample size limits generalizability. The physiological meaning of the findings (instantaneous center frequency) remains unclear.
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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