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    Decreased vagal power during treadmill walking in patients with chronic fatigue syndrome.

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    Authors
    Cordero, D L
    Sisto, S A
    Tapp, W N
    LaManca, Jaddy J
    Pareja, J G
    Natelson, B H
    Affiliation
    Fatigue Research Center, DVA Medical Center, East Orange, NJ 07018, USA.
    Issue Date
    1996-12
    
    Metadata
    Show full item record
    Abstract
    The purpose of this study was to determine if patients with the chronic fatigue syndrome have less vagal power during walking and rest periods following walking, in comparison to a group of healthy controls. Eleven patients (ten women and one man) who fulfilled the case definition for chronic fatigue syndrome modified to reduce heterogeneity and eleven healthy, but sedentary, age- and sex-matched controls walked on a treadmill at 2.5 mph four times each for 4 min duration. Between each period of walking, subjects were given a 4-min seated rest period. Vagal power, a Fourier-based measure of cardiac, parasympathetic activity in the frequency range of 0.15 to 1.0 Hz, was computed. In each period of walking and in one period of rest, patients had significantly less vagal power than the control subjects despite there being no significant group-wise differences in mean heart rate, tidal volume, minute volume, respiratory rate, oxygen consumption or total spectrum power. Further, patients had a significant decline in resting vagal power after periods of walking. These results suggest a subtle abnormality in vagal activity to the heart in patients with the chronic fatigue syndrome and may explain, in part, their post-exertional symptom exacerbation.
    Citation
    Decreased vagal power during treadmill walking in patients with chronic fatigue syndrome. 1996, 6 (6):329-33 Clin. Auton. Res.
    Journal
    Clinical Autonomic Research
    URI
    http://hdl.handle.net/10541/109861
    DOI
    10.1007/BF02556303
    PubMed ID
    8985621
    Type
    Article
    Language
    en
    ISSN
    0959-9851
    ae974a485f413a2113503eed53cd6c53
    10.1007/BF02556303
    Scopus Count
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