Time course of narrow frequency bands in the waking EEG during sleep deprivation

Marie Dumont · M. Mila Macchi · Julie Carrier · Chantal Lafrance · Marc Hébert

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Sleep and Work-Related Fatigue Circadian rhythm and melatonin Sleep and Wakefulness Research

Abstract

Electroencephalograms (EEGs) of 14 normal subjects were recorded every 2 h during 38 h constant routines. Adjacent narrow frequency bands (NFB) with similar temporal trends were grouped into frequency clusters. Clusters I (2.00-7.75 Hz) and III (11.00-14.75 Hz) exhibited similar time courses which may reflect both the duration of time awake and a circadian modulation. Cluster II (8.00-10.75 Hz) was characterized by a time course similar to the circadian modulation of core body temperature. Cluster V (18.00-24.75 Hz) was correlated with subjective sleepiness and may reflect the increasing effort made by subjects to perform the task as sleep deprivation lengthened. Various NFB in the waking EEG may reflect different physiological mechanisms underlying variations in vigilance states.

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References

1990Subjective and Objective Sleepiness in the Active Individual 1988Clinical applications of visual analogue scales: a critical review 1992Circadian and sleep/wake dependent aspects of subjective alertness and cognitive performance

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2003Distinctive effects of modafinil and d-amphetamine on the homeostatic and circadian modulation of the human waking EEG 2003Effect of 38 h of total sleep deprivation on the waking EEG in women: sex differences 2007Slow Eye Movements and Subjective Estimates of Sleepiness Predict EEG Power Changes During Sleep Deprivation

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