抄録
It is now recognized that the effects of nightwork result jointly from desynchronization of circadian rhythms and from the job content. In scheduling nightwork, use should be made of the shift systems most compatible with the biological rhythms and social patterns of the workers concerned, and specific measures should be implemented to reduce demands on nightworkers. Job content is of particular importance in the hospital sector, where demands vary greatly from one department to another. Above all, the tasks accomplished by those on nightshift differ markedly from those of daytime workers: nightwork is limited to scheduled health care jobs that cannot be deferred until the morning, and to management of incidents. Yet staffing levels at night are reduced. Certain daytime resources are lacking at night, and the working conditions, generally defined with reference to the activities of daytime personnel fail to take into account the specific features of nightwork which are largely ignored by the management. On the basis of various studies conducted in French hospitals (extensive questionnaire surveys, ergonomic analyses in different departments), these features of nightwork and the corresponding need for appropriate responses, in terms of shift systems and job content, are reviewed and discussed.
