Naschitz, Jochanan E, Rozenbaum, Michael, Fields, Madeline C et al. · The Journal of rheumatology · 2005
This study looked at how the hearts of fibromyalgia patients respond to position changes (lying down versus standing up) compared to people with other conditions including ME/CFS. Researchers used a specialized test that measures heart rate patterns during a tilt test and analyzed the data with advanced mathematical methods. They found no single heart response pattern that was unique to fibromyalgia, suggesting that fibromyalgia patients have different types of heart responses rather than one shared pattern.
This study is relevant to ME/CFS because both conditions are often associated with dysautonomic symptoms, and the comparison groups included CFS patients. The finding of cardiovascular heterogeneity suggests that both FM and ME/CFS may represent diverse physiological subtypes rather than single diseases, which has implications for developing targeted treatments and understanding disease mechanisms in these overlapping conditions.
This study does not prove that fibromyalgia lacks cardiovascular involvement—only that a specific, uniform cardiovascular pattern does not distinguish FM from other conditions. It does not establish causation or determine whether cardiovascular abnormalities (if present) cause FM symptoms. The cross-sectional design cannot identify whether cardiovascular changes precede, follow, or occur independently of FM onset.
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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