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    Hypothesis: A perfect day conveys internal time

    Access Status
    Fulltext not available
    Authors
    Groß, J.
    Fritschi, Lin
    Erren, T.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Groß, J. and Fritschi, L. and Erren, T. 2017. Hypothesis: A perfect day conveys internal time. Medical Hypotheses. 101: pp. 85-89.
    Source Title
    Medical Hypotheses
    DOI
    10.1016/j.mehy.2017.02.010
    ISSN
    0306-9877
    School
    Epidemiology and Biostatistics
    URI
    http://hdl.handle.net/20.500.11937/51838
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier LtdIn 2007 the International Agency for Research on Cancer [IARC] concluded “shift work that involves circadian disruption is probably carcinogenic to humans” (Group 2A). To investigate the “probable” causal link, information on individual chronobiology is needed to specify exposures to circadian disruption associated with shift work. In epidemiological studies this information is usually assessed by questionnaire. The most widely used Morningness-Eveningness-Questionnaire (MEQ) and MunichChronoTypeQuestionnaire (MCTQ) reveal information on circadian type (MEQ) and actual sleep behaviour (MCTQ). As a further option we suggest to obtain preferred sleep times by using what we call the perfect day (PD) approach. We hypothesize that a PD – as a day of completely preferred sleep behaviour – captures pristine internal time. We argue that the PD approach may measure internal time more accurately than the MEQ and MCTQ which convey influences by work and social time pressures. The PD approach may therefore reduce misclassifications of internal time and reveal circadian disruption caused by different shift systems.

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