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  • 1
    Electronic Resource
    Electronic Resource
    Experimental shift work studies of permanent night, and rapidly rotating, shift systems (1980)
    Springer
    International archives of occupational and environmental health 46 (1980), S. 111-125 
    Details
    ISSN: 1432-1246
    Keywords: Shift work ; Night sleep ; Day sleep ; Ultradian rhythmicity ; Noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In connection with experimental shift work 20 volunteers were examined while working on different rapidly or slowly rotating shift systems. Sleep was analysed over a total of 112 days. Sleep was disturbed by childrens' noise or traffic noise. Sleep duration and sleep quality were particularly badly affected by noise with a high information value (childrens' noise). The ultradian rhythmicity of sleep did not appear to be disrupted by the change from day to night work. There were no significant differences between morning sleep and afternoon sleep after night work. In the laboratory experiments with fixed sleep durations, no separate effects on sleep quality could be established for different shift systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378190
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Duration of sleep depending on the type of shift work (1980)
    Springer
    International archives of occupational and environmental health 46 (1980), S. 167-177 
    Details
    ISSN: 1432-1246
    Keywords: Sleep duration ; Shift work ; Day sleep ; Night sleep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Time budget studies were performed in eight groups of shift workers. The 9,480 diary records of altogether 1,230 shift workers were analyzed and related to corresponding shift types. The shortest night sleep was found before the morning shift (mean 7.0 h). There were large differences in the duration of day sleep when classifying this sleep into specific types, as day sleep before 1st night shift (mean 2.1 h), between two night shifts (mean 6.1 h), or after last night shift (mean 4.2 h). Average sleep durations of five kinds of day sleep and 12 kinds of night sleep are presented together with 14 frequency distributions of durations of sleep. It is concluded that there should not be many night shifts in succession and that morning shifts should not begin too early to avoid an accumulation of sleep deficits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378195
    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 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
  • 4
    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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