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- W33216822 abstract "1. Theoretical and practical considerations suggest that in subjects complaining of fatigue, in the absence of evident organ dysfunction, an alteration in the autonomic nervous system might be present as a functional correlate. 2. Autoregressive spectral analysis of R-R interval variability from a surface ECG, was used in healthy control subjects (n = 24, age 45 ± 4 years) and in subjects complaining of unexplained fatigue (n = 53, age 46 ± 9 years) to obtain quantitative indices of the state of the sympathovagal balance, both at rest and during a mental stimulus (mental arithmetic), capable of enhancing sympathetic drive. Sympathetic and vagal modulations were inferred from the normalized powers of the low frequency and high frequency spectral components respectively. 3. We observed in patients, at rest, a prevailing low frequency component of R-R variability (patients low frequency = 73 ± 11, control subjects 51 ± 10 normalized units, P < 0.05). The responsiveness to mental arithmetic was reduced in patients as compared with controls. Systolic blood pressure variability did not differ. This suggested a selective imbalance in autonomic control of the sinoatrial node, characterized by sympathetic predominance as well as by vagal withdrawal, at rest. 4. The possibility of discriminating patients from control subjects on the basis of simple non-invasive functional markers might provide a better understanding of the mechanisms, clinical evolution and outcome of conditions such as the chronic fatigue syndrome, which lack ordinary evidence of disease, but comprise, as physiopathological correlate, a quantitative alteration of autonomic control." @default.
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- W33216822 title "Sympathetic Overactivity in Subjects Complaining of Unexplained Fatigue" @default.
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- W33216822 doi "https://doi.org/10.1042/cs0870655" @default.
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