Article Text

Interindividual differences in circadian fatigue patterns of shift workers
1. O. Östberg1
1. aLogging Research Foundation, Drottninggatan 97, S-11360 Stockholm, Sweden

## Abstract

Östberg, O. (1973).British Journal of Industrial Medicine,30, 341-351. Interindividual differences in circadian fatigue patterns of shift workers. Data from 37 computer operators and output-handlers, working on discontinuous 8-16-24 alternating shifts, were collected in the morning, evening, and night shifts during a one-year period. The study was directed to the interindividual differences in the workers' circadian patterns of activity, sleep, oral temperature, time estimation, physical fitness, and food intake. By means of a questionnaire on preferences and habits of activity and time of day, three subgroups of five subjects each were selected—morning', middle', and evening' groups. Significant differences were found between the groups and between the shifts. Most interesting was the significant interaction of group × shift, on the basis of which it could be concluded that the morning' type of subjects had the most pronounced difficulty in adapting to the shift system practised. It is thought that a refinement of the questionnaire used should eventually result in a tool for assessing a person's circadian type and the interaction of type × shift.

## Footnotes

• 1 Present address: Department of Ergonomics, Loughborough University of Technology, Loughborough, England.

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