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Titolo:
Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks
Autore:
Higuchi, S; Liu, Y; Yuasa, T; Maeda, A; Motohashi, Y;
Indirizzi:
Akita Univ, Sch Med, Dept Publ Hlth, Akita 0108543, Japan Akita Univ Akita Japan 0108543 Med, Dept Publ Hlth, Akita 0108543, Japan
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 6, volume: 112, anno: 2001,
pagine: 997 - 1000
SICI:
1388-2457(200106)112:6<997:DVIAPD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CIRCADIAN-RHYTHM; ORAL-TEMPERATURE; REACTION-TIME; HEART-RATE; EEG; WAKEFULNESS; DEPRIVATION; DRIVERS; ADULTS;
Keywords:
diurnal variation; repeated vigilance task; alpha power of EEG; sleepiness; oral temperature; post lunch dip;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Higuchi, S Akita Univ, Sch Med, Dept Publ Hlth, 1-1-1 Hondo, Akita 0108543, Japan Akita Univ 1-1-1 Hondo Akita Japan 0108543 kita 0108543, Japan
Citazione:
S. Higuchi et al., "Diurnal variations in alpha power density and subjective sleepiness while performing repeated vigilance tasks", CLIN NEU, 112(6), 2001, pp. 997-1000

Abstract

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 vigilancetasks 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 08:27:13