Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks

Shigekazu Higuchi, Yang Liu, Takao Yuasa, Akira Maeda, Yutaka Motohashi

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

Objective: Diurnal variations in EEG activity and subjectively rated sleepiness while performing repeated vigilance tasks were examined. Methods: Nine diurnally active healthy males underwent repeated vigilance tasks at 08:00, 11:00, 14:00, 17:00 and 20:00 h. An electroencephalogram (EEG) was taken while the subjects performed the tasks with their eyes open. The alpha power spectra (8.6-13.3 Hz) of EEG was integrated. Subjectively rated sleepiness, reaction time and oral temperature were also measured. Results: Significant diurnal variations were found for alpha power, subjectively rated sleepiness and oral temperature. The alpha power was significantly smaller at 08:00 than at 11:00, 14:00, 17:00 and 20:00 h. The subjectively rated sleepiness was significantly larger at 08:00 than at 11:00, 17:00 and 20:00 h. The diurnal variation in alpha power did not correspond to that in subjectively rated sleepiness. On the other hand, repeated vigilance tasks increased the alpha power, subjectively rated sleepiness and reaction time at each time of day. The increase in alpha power was significantly greater at 14:00 than at 08:00 and 20:00 h. Conclusions: The diurnal variation was found in alpha power while performing vigilance tasks. Furthermore, the increase in alpha power with repetition of the task depended on the time of day.

本文言語英語
ページ(範囲)997-1000
ページ数4
ジャーナルClinical Neurophysiology
112
6
DOI
出版ステータス出版済み - 6 12 2001
外部発表はい

All Science Journal Classification (ASJC) codes

  • 感覚系
  • 神経学
  • 臨床神経学
  • 生理学(医学)

フィンガープリント

「Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル