Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks
Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks
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DOI：
10.1016/s1388-2457(01)00527-2
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发表时间：
2001-06-01
影响因子：
4.7
通讯作者：
Motohashi, Y
中科院分区：
文献类型：
--
作者：
Higuchi, S;Liu, Y;Motohashi, Y
目的：检查执行重复警戒任务时脑电图活动和主观评定的睡意的昼夜变化。方法：9 名每日活跃的健康男性在 08:00、11:00、14:00 接受重复警戒任务。 17:00 和 20:00 点。当受试者睁着眼睛执行任务时，会采集脑电图（EEG）。脑电图的α功率谱（8.6-13.3 Hz）被积分。主观评定困倦程度。还测量了反应时间和口腔温度。结果：发现阿尔法功率、主观评定的睡意和口腔温度存在显着的昼夜变化。 08:00 的 alpha 功率明显小于 11:00、14:00、17:00 和 20:00。 08:00 时主观评定的困倦程度显着高于 11:00、17:00 和 20:00。阿尔法功率的昼夜变化与主观评定的睡意的变化并不对应。另一方面，重复的警戒任务增加了阿尔法力量。主观评价一天中每个时间的困倦和反应时间。 11:00 时 α 功率的增加明显大于 08:00 和 20:00。结论：执行警戒任务时，α 功率存在昼夜变化。此外，随着任务的重复，阿尔法功率的增加取决于一天中的时间。 (C) 2001 Elsevier Science Ireland Ltd. 保留所有权利。
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 11:00 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. (C) 2001 Elsevier Science Ireland Ltd. Ail rights reserved.