Wyller, Vegard Bruun, Due, Reidar, Saul, J Philip et al. · The American journal of cardiology · 2007 · DOI
This study tested how the hearts of adolescents with ME/CFS respond to mild physical stress (tilting the body slightly upright for 15 minutes) compared to healthy teenagers. Researchers found that young people with ME/CFS had abnormal heart and blood vessel responses during this test—their hearts beat faster, their blood pressure increased more, and their stroke volume (amount of blood pumped per heartbeat) decreased more than in healthy controls. These differences suggest that ME/CFS involves problems with how the body regulates blood flow and heart function during even mild stress.
This study provides objective physiological evidence that ME/CFS involves measurable abnormalities in cardiovascular regulation, supporting the biological basis of the disease rather than viewing it as purely psychological. Identifying these hemodynamic markers in adolescents may help with earlier diagnosis and could guide development of targeted treatments aimed at normalizing cardiovascular responses.
This study does not establish whether cardiovascular dysfunction causes ME/CFS symptoms or is a consequence of the underlying disease process. The findings are specific to adolescents under controlled laboratory conditions and may not apply to adults or reflect real-world symptom triggers. Additionally, the study does not explain the mechanisms driving these abnormalities or their relationship to post-exertional malaise.
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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