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  • 1
    Electronic Resource
    Electronic Resource
    Changes in the temperature rhythm of submariners following a rapidly rotating watchkeeping system for a prolonged period (1979)
    Springer
    International archives of occupational and environmental health 42 (1979), S. 185-190 
    Details
    ISSN: 1432-1246
    Keywords: Circadian rhythm ; Body-temperature ; Submariners ; Watchkeeping ; Sleep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary On-watch readings of oral temperature were obtained at hourly intervals from submariners during two continuously submerged voyages of 48 days duration. The subjects followed a rapidly rotating watchkeeping system of 4-h dutyspells during the entire period. In the majority of cases, the amplitude of the circadian temperature rhythm progressively declined, and this was accompanied by a tendency for the rhythm to disintegrate into shorter periods, associated with the length of the duty spell and the particular pattern of sleep adopted. On one voyage, one subject's rhythm showed a tendency to “free-run”, with a period of 24.6 h. It is concluded that the results give pointers to the kind of effect to be looked for in studies of shift-workers following similarly highly irregular patterns of work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377772
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Work at sea: a study of sleep, and of circadian rhythms in physiological and psychological functions, in watchkeepers on merchant vessels (1988)
    Springer
    International archives of occupational and environmental health 60 (1988), S. 321-329 
    Details
    ISSN: 1432-1246
    Keywords: Watchkeeping ; Circadian rhythms ; Fatigue ; Sleep ; Performance efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The safety of a ship depends substantially on its bridge watchkeepers, whose alertness and efficiency must be maintained at all hours of the day and night. Fatigue, circadian rhythms, and sleep disruption occasioned by the unusual working hours of these personnel may all affect their performance. A methodology for assessing the magnitude of this problem is proposed. The application of this methodology in a large-scale shipboard study of merchant mariners on extended voyages is then described, and details given of the techniques used to measure sleep and activity, and temporal variations in a range of physiological and psychological parameters. A summary of the data collected in the study is provided as a reference point for the reports on the different aspects of the results that follow in subsequent articles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405665
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Work at sea: a study of sleep, and of circadian rhythms in physiological and psychological functions, in watchkeepers on merchant vessels (1988)
    Springer
    International archives of occupational and environmental health 61 (1988), S. 51-57 
    Details
    ISSN: 1432-1246
    Keywords: Watchkeeping ; Sleep ; Circadian rhythms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A trial of an alternative to the traditional 4-on/8-off watchkeeping system was made on a container ship during a round trip from Europe to the Far East. The three navigating officers on the ship operated the new system, which involved “compressed” working hours with a long unbroken period of rest, during two sections of the voyage, one of which included six stops at ports. Despite unforeseen problems arising mainly from these stops, questionnaire responses concerning the new system were not altogether unfavourable to it, and daily records kept by the officers gave some support to the hypothesis that sleep would be better than under the traditional system. However, a number of difficulties were encountered; these are discussed in relation to the design of future studies of alternative watchkeeping systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381607
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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