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    Sleep profiles and mood state changes during an expedition to the South Pole: a case study of a female explorer.

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    Authors
    Pedlar, Charles R.
    Lane, Andrew M.
    Lloyd, Juliette C.
    Dawson, Jean
    Emegbo, Stephen
    Whyte, Gregory P.
    Stanely, Neil
    Issue Date
    2007
    
    Metadata
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    Abstract
    Objectives: To investigate sleep parameters and mood profiles of a female explorer traveling solo and unaided to the South Pole during the winter. Methods: During the 44-day expedition, global activity and sleep were assessed using a wrist actigraph (AW) worn on the non-dominant wrist. Mood was assessed using an adapted Profile of Mood States questionnaire. Pre- and post- expedition physiological profiles were conducted to assess body composition, strength and power and aerobic capacity. Results: The AW data revealed decreasing sleep duration throughout the expedition, with an average sleep time of 5 hours (range: 8hr 14mins – 1hr 42mins), with sleep times consistently below 3 hours during the final third of the expedition. Mood responses indicated a progressive reduction in vigour and increase in fatigue. Sleep time was positively related to vigour and inversely related to depression and fatigue, a finding that is consistent with the notion that positive feelings (high vigour and low fatigue) are linked with sleep. Conclusions: This account provides insight to help understand the limits of human tolerance and may be directly applicable when planning future expeditions of this nature.
    Citation
    Wilderness and Environmental Medicine, 18(2): 127-132
    Publisher
    Wilderness Medical Society
    Journal
    Wilderness and Environmental Medicine
    URI
    http://hdl.handle.net/2436/65953
    DOI
    10.1580/06-WEME-BR-039R1.1
    Additional Links
    http://www.wemjournal.org/wmsonline/?request=get-document&issn=1080-6032&volume=018&issue=02&page=0127
    Type
    Journal article
    Language
    en
    ISSN
    10806032
    ae974a485f413a2113503eed53cd6c53
    10.1580/06-WEME-BR-039R1.1
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    Faculty of Education, Health and Wellbeing

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