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Two circadian rhythms in the human electroencephalogram during wakefulness.

Content Provider	Semantic Scholar
Author	Aeschbach, Daniel Matthews, Jeffery R. Postolache, Teodor T. Jackson, Michael A. Giesen, Holly A. Wehr, Thomas R.
Copyright Year	1999
Abstract	The influence of the circadian pacemaker and of the duration of time awake on the electroencephalogram (EEG) was investigated in 19 humans during ∼40 h of sustained wakefulness. Two circadian rhythms in spectral power density were educed. The first rhythm was centered in the theta band (4.25-8.0 Hz) and exhibited a minimum ∼1 h after the onset of melatonin secretion. The second rhythm was centered in the high-frequency alpha band (10.25-13.0 Hz) and exhibited a minimum close to the body temperature minimum. The latter rhythm showed a close temporal association with the rhythms in subjective alertness, plasma melatonin, and body temperature. In addition, increasing time awake was associated with an increase of power density in the 0.25- to 9.0-Hz and 13.25- to 20.0-Hz ranges. It is concluded that the waking EEG undergoes changes that can be attributed to circadian and homeostatic (i.e., sleep-wake dependent) processes. The distinct circadian variations of EEG activity in the theta band and in the high-frequency alpha band may represent electrophysiological correlates of different aspects of the circadian rhythm in arousal.
Starting Page	R1771
Ending Page	R1779
Page Count	1
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ajpregu.physiology.org/content/ajpregu/277/6/r1771.full.pdf
Alternate Webpage(s)	http://ajpregu.physiology.org/content/ajpregu/277/6/R1771.full.pdf
PubMed reference number	29598749v1
Alternate Webpage(s)	https://doi.org/10.1152/ajpregu.1999.277.6.R1771
DOI	10.1152/ajpregu.1999.277.6.R1771
Journal	American journal of physiology. Regulatory, integrative and comparative physiology
Volume Number	277
Issue Number	6
Language	English
Access Restriction	Open
Subject Keyword	Arousal Body Dysmorphic Disorders Circadian Rhythms Electroencephalography Phase Synchronization Hertz (Hz) Homeostasis Lewy Body Disease Melatonin Sleep Disorders, Circadian Rhythm Wakefulness
Content Type	Text
Resource Type	Article

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