期刊
CLINICAL NEUROPHYSIOLOGY
卷 112, 期 6, 页码 992-996出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/S1388-2457(01)00507-7
关键词
sleep; electroencephalographic activity; heart rate variability; sympathovagal balance; ultradian rhythm
Objective: We investigate the relationship between changes in heart rate variability and electroencephalographic (EEG) activity during sleep. Method: Nine male subjects with regular non-rapid-eye movement-rapid-eye movement (NREM-REM) sleep cycles were included in the study. They underwent EEG and cardiac recordings during one experimental night. Heart rate variability was determined over 5-min periods by the ratio of low frequency to low frequency plus high frequency power [LF/(LF + HF)] calculated using spectral analysis of R-R intervals. EEG spectra were analyzed using a fast Fourier transform algorithm. Results: We found an ultradian 80-120 min rhythm in the LF/(LF + HF) ratio, with high levels during rapid eye movement (REM) sleep and low levels during slow wave sleep (SWS). During sleep stage 2 there was a progressive decrease in the transition from REM sleep to SWS, and an abrupt increase from SWS to REM sleep. These oscillations were significantly coupled in a 'mirror-image' to the overnight oscillations in delta wave activity, which reflect sleep deepening and lightening. Cardiac changes preceded EEG changes by about 5 min. Conclusions: These findings demonstrate the existence of an inverse coupling between oscillations in delta wave activity and heart rate variability. They indicate a non-uniformity in sleep stage 2 that underlies ultradian sleep regulation. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
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