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Psychosomatic Medicine, Vol 60, Issue 5 610-615, Copyright © 1998 by American Psychosomatic Society
ORIGINAL ARTICLES |
MH Bonnet and DL Arand
Dayton VA Hospital, Wright State University, and Kettering Medical Center, OH 45428, USA. bonnet.michael@dayton.va.gov
OBJECTIVE: It was hypothesized that psychophysiological insomniacs, who have been shown to have elevated heart rate, body temperature, and whole body metabolic rate, would also have increased low frequency and decreased high frequency power in the spectral analysis of their heart period data. METHOD: Groups of 12 objectively defined insomniacs and age-, sex-, and weight-matched controls with normal sleep were evaluated on sleep and EKG measures over a 36-hour sleep laboratory stay. RESULTS: Heart period was decreased (ie, heart rate was increased) and its SD was decreased in all stages of sleep in the insomniacs compared with the controls. Spectral analysis revealed significantly increased low frequency power and decreased high frequency power in insomniacs compared with controls across all stages of sleep. CONCLUSIONS: Because increased low frequency spectral power is an indicator of increased sympathetic nervous system activity, these data imply that chronic insomniacs could be at increased risk for the development of disorders, such as coronary artery disease, that are related to increased sympathetic nervous system activity.
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