Wyller, Vegard Bruun, Saul, J Philip, Walløe, Lars et al. · European journal of applied physiology · 2008 · DOI
This study looked at how the bodies of adolescents with ME/CFS respond to physical stress, specifically when lying down while pressure is applied to the legs and while squeezing a hand grip. Researchers found that ME/CFS patients had higher heart rates and stress hormone levels even at rest, and their cardiovascular system overreacted to the leg pressure test but underreacted during the hand grip exercise compared to healthy teenagers.
Orthostatic intolerance and cardiovascular symptoms are common in ME/CFS, and this study provides objective physiological evidence of dysregulated sympathetic nervous system function in adolescent patients. Understanding these cardiovascular mechanisms may help explain exercise intolerance and symptom exacerbation, potentially informing future treatments targeting autonomic dysfunction.
This study cannot prove that sympathetic dysfunction causes ME/CFS—only that an association exists. The small sample size (n=15) limits generalizability to all adolescents with ME/CFS. The cross-sectional design does not establish whether cardiovascular dysregulation precedes ME/CFS onset or develops as a consequence of illness.
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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