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North SeaOceans and SeasSea UrchinsGadus morhuaNorth AmericaPlanktonFlatfishesPhocoenaSeawaterAtlantic OceanFisheriesPorpoisesNorth CarolinaZooplanktonPetroleumPhocaSea AnemonesMediterranean SeaDivingHoming BehaviorDecapoda (Crustacea)Extraction and Processing IndustryHyperpigmentationPerciformesMarine BiologyPopulation DynamicsEcosystemFishesEutrophicationPhytoplanktonCaudoviralesGammaproteobacteriaRoseobacterSea CucumbersPhylogenyFish Diseases

Complex interplays among population dynamics, environmental forcing, and exploitation in fisheries. (41/114)

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Mapping the spawning grounds of North Sea cod (Gadus morhua) by direct and indirect means. (42/114)

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Reproductive isolation, evolutionary distinctiveness and setting conservation priorities: the case of European lake whitefish and the endangered North Sea houting (Coregonus spp.). (43/114)

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Feasibility of assessing the community composition of prasinophytes at the Helgoland Roads sampling site with a DNA microarray. (44/114)

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The dangers of ignoring stock complexity in fishery management: the case of the North Sea cod. (45/114)

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Incidence of Brucella species in marine mammals of the German North Sea. (46/114)

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Mercury immune toxicity in harbour seals: links to in vitro toxicity. (47/114)

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Shift work disorder among oil rig workers in the North Sea. (48/114)

STUDY OBJECTIVES: Shift work disorder (SWD) is a circadian rhythm sleep disorder caused by work hours during the usual sleep period. The main symptoms are excessive sleepiness and insomnia temporally associated with the working schedule. The aim of the present study was to examine SWD among shift workers in the North Sea. DESIGN AND PARTICIPANTS: A total of 103 shift workers (2 weeks on 7 nights/7days, 12-h shifts, 4 weeks off), mean age 39.8 years, working at an oil rig in the North Sea responded to a questionnaire about SWD. They also completed the Pittsburgh Sleep Quality Index, Bergen Insomnia Scale, Epworth Sleepiness Scale, Composite Morningness Questionnaire, Subjective Health Complaint Inventory, Demand/Control, and Instrumental Mastery Oriented Coping (based on the Utrecht Coping list). Most of these instruments were administered during the first day of the 2-week working period, thus reflecting symptoms and complaints during the 4-week non-work period. The shift workers were also compared to day workers at the oil rig. RESULTS: Twenty-four individuals were classified as suffering from SWD, yielding a prevalence for SWD of 23.3%. During the 4-week non-work period, individuals with SWD reported significantly poorer sleep quality, as measured by the Pittsburgh Sleep Quality Index, and more subjective health complaints than individuals not having SWD. There were no differences between the 2 groups in sleepiness, insomnia, circadian preference, psychological demands, or control. Individuals with SWD reported significantly lower scores on coping. The reports of shift workers without SWD were similar to those of day workers regarding sleep, sleepiness, subjective health complaints, and coping. CONCLUSIONS: The prevalence of SWD was relatively high among these shift workers. Individuals with SWD reported poorer sleep quality and more subjective health complaints in the non-work period than shift workers not having SWD.  (+info)