Alpha-wave frequency characteristics in health and insomnia during sleep

Journal of Sleep Research
Justus T C SchwabedalNiels Wessel

Abstract

Appearances of alpha waves in the sleep electrencephalogram indicate physiological, brief states of awakening that lie in between wakefulness and sleep. These microstates may also cause the loss in sleep quality experienced by individuals suffering from insomnia. To distinguish such pathological awakenings from physiological ones, differences in alpha-wave characteristics between transient awakening and wakefulness observed before the onset of sleep were studied. In polysomnographic datasets of sleep-healthy participants (n = 18) and patients with insomnia (n = 10), alpha waves were extracted from the relaxed, wake state before sleep onset, wake after sleep-onset periods and arousals of sleep. In these, alpha frequency and variability were determined as the median and standard deviation of inverse peak-to-peak intervals. Before sleep onset, patients with insomnia showed a decreased alpha variability compared with healthy participants (P < 0.05). After sleep onset, both groups showed patterns of decreased alpha frequency that was lower for wake after sleep-onset periods of shorter duration. For patients with insomnia, alpha variability increased for short wake after sleep-onset periods. Major differences between the two groups w...Continue Reading

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Citations

Sep 1, 2017·ELife·Eric LowetPeter De Weerd
Nov 19, 2019·Journal of Medical Signals and Sensors·Mohammad RezaeiHabibolah Khazaie
Nov 23, 2017·Sleep·Stephanie R YiallourouRosemary S C Horne
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Jul 3, 2021·Journal of Personalized Medicine·Anastasiya RunnovaMaksim Zhuravlev

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