Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/65724
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Type: Journal article
Title: Sleep, Wake and Phase Dependent Changes in Neurobehavioral Function under Forced Desynchrony
Author: Zhou, X.
Ferguson, S.
Matthews, R.
Sargent, C.
Darwent, D.
Kennaway, D.
Roach, G.
Citation: Sleep, 2011; 34(7):931-941
Publisher: Amer Academy Sleep Medicine
Issue Date: 2011
ISSN: 0161-8105
1550-9109
Statement of
Responsibility: 
Xuan Zhou, Sally A. Ferguson, Raymond W. Matthews, Charli Sargent, David Darwent, David J. Kennaway, Gregory D. Roach
Abstract: Study Objectives: The homeostatic-circadian regulation of neurobehavioral functioning is not well understood in that the role of sleep dose in relation to prior wake and circadian phase remains largely unexplored. The aim of the present study was to examine the neurobehavioral impact of sleep dose at different combinations of prior wake and circadian phase. Design: A between-participant design involving 2 forced desynchrony protocols varying in sleep dose. Both protocols comprised 7 repetitions of a 28-h sleep/wake cycle. The sleep dose in a standard protocol was 9.33 h per 28-h day and 4.67 h in a sleep-restricted protocol. Setting: A time-isolation laboratory at the Centre for Sleep Research, the University of South Australia. Participants: A total of 27 young healthy males participated in the study with 13 in the standard protocol (age 22.5 ± 2.2 y) and 14 in the sleep-restricted protocol (age 21.8 ± 3.8 y). Interventions: Wake periods during both protocols were approximately 4 h delayed each 28-h day relative to the circadian system, allowing performance testing at different combinations of prior wake and circadian phase. The manipulation in sleep dose between the 2 protocols, therefore, allowed the impact of sleep dose on neurobehavioral performance to be examined at various combinations of prior wake and circadian phase. Measurements and Results: Neurobehavioral function was assessed using the psychomotor vigilance task (PVT). There was a sleep dose x circadian phase interaction effect on PVT performance such that sleep restriction resulted in slower and more variable response times, predominantly during the biological night. This interaction was not altered by prior wakefulness, as indicated by a nonsignificant sleep dose x circadian phase × prior wake interaction. Conclusions: The performance consequence of sleep restriction in our study was prominent during the biological night, even when the prior wake duration was short, and this performance consequence was in forms of waking state instability. This result is likely due to acute homeostatic sleep pressure remaining high despite the sleep episode.
Keywords: Humans; Sleep Deprivation; Cognition; Task Performance and Analysis; Motor Skills; Attention; Sleep; Circadian Rhythm; Adult; Male; Young Adult
Rights: © Copyright 2011 Associated Professional Sleep Societies, LLC.
RMID: 0020111422
DOI: 10.5665/SLEEP.1130
Appears in Collections:Obstetrics and Gynaecology publications

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