title: No first night shift effect observed following a nocturnal main sleep and a prophylactic 1-h afternoon nap.
abstract: Neurobehavioural impairment on the first night shift is often greater than on subsequent night shifts due to extended wakefulness. The aim of the study was to determine whether a 1-h afternoon nap prior to the first night shift is sufficient to produce neurobehavioural performance at levels comparable to the second night shift. Twelve male volunteers (mean age 22.9 years) participated in a laboratory protocol that simulated two 12-h night shifts. A nap preceded the first shift and a 7-h daytime sleep was scheduled between shifts. Neurobehavioural performance and subjective sleepiness measured across each night did not significantly differ between first and second shifts.
authors.affiliation: a Appleton Institute for Behavioural Science , Central Queensland University , Adelaide , Australia.|b Bushfire Cooperative Research Centre , East Melbourne , Victoria , Australia.
authors.forename: Anastasi
authors.initials: A
authors.lastname: Kosmadopoulos
authors.affiliation: a Appleton Institute for Behavioural Science , Central Queensland University , Adelaide , Australia.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zhou
authors.affiliation: a Appleton Institute for Behavioural Science , Central Queensland University , Adelaide , Australia.
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Roach
authors.affiliation: a Appleton Institute for Behavioural Science , Central Queensland University , Adelaide , Australia.
authors.forename: David
authors.initials: D
authors.lastname: Darwent
authors.affiliation: a Appleton Institute for Behavioural Science , Central Queensland University , Adelaide , Australia.
authors.forename: Charli
authors.initials: C
authors.lastname: Sargent
mesh_terms: D000293:Adolescent; D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology*; D006801:Humans; D008297:Male; D011930:Reaction Time; D012890:Sleep / Q000502:physiology*; D012892:Sleep Deprivation / Q000503:physiopathology; D020178:Sleep Disorders, Circadian Rhythm / Q000503:physiopathology*; D013647:Task Performance and Analysis; D014851:Wakefulness / Q000502:physiology*; D014940:Work Schedule Tolerance / Q000502:physiology*; D055815:Young Adult
keywords: Countermeasures; fatigue; napping; shift work; sleep deprivation; vigilance