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    Circadian and behavioural responses to shift work-like schedules of light/dark in the mouse

    McGowan, Niall M. and Coogan, Andrew (2013) Circadian and behavioural responses to shift work-like schedules of light/dark in the mouse. Journal of Molecular Psychiatry, 1 (7). ISSN 2049-9256

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    Background: Disruption of circadian rhythms is associated with several deleterious health consequences and cognitive impairment. It is estimated that as many as one in five workers are exposed to this risk factor due to experiencing some degree of chronodisruption by way of recurring patterns of shift work. It is not presently clear therefore how efficiently the mammalian circadian system entrains to alternative light/dark cycles such as those found in shift work schedules. Methods: The present study examines male CD-1 mice exposed to three different paradigms of rapidly rotating shift work-like light/dark manipulations compared to control animals maintained on a standard 12:12 h light/dark cycle. Results: Analysis of circadian patterns of behaviour under such conditions reveals that for fast rotating schedules of light/dark there is minimal circadian entrainment. Further, when placed in constant conditions after a period under the “shift work” lighting conditions there were changes to circadian period associated with the shift work schedules. In contrast to previous studies the shift work-like conditions did not produce changes in animal bodyweight. Behavioural testing suggests possible anxiogenic and hyperactive outcomes dependent on rotation speed as animals displayed open field thigmotaxis and hyperlocomotion. Conclusion: These results indicate that exposure to alternating patterns of light and dark as experienced by millions of shift workers may produce long-lasting changes in both mammalian circadian and neurobehavioural systems.

    Item Type: Article
    Additional Information: © 2013 McGowan and Coogan; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. doi:10.1186/2049-9256-1-7 Cite this article as: McGowan and Coogan: Circadian and behavioural responses to shift work-like schedules of light/dark in the mouse. Journal of Molecular Psychiatry 2013 1:7.
    Keywords: Circadian; Shift work; Mouse; Entrainment;
    Academic Unit: Faculty of Science and Engineering > Psychology
    Item ID: 6715
    Identification Number:
    Depositing User: Dr. Andrew Coogan
    Date Deposited: 05 Jan 2016 15:46
    Journal or Publication Title: Journal of Molecular Psychiatry
    Publisher: BioMed Central
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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