What question did this study set out to answer?

To examine diurnal variations in mental performance and physiological processes across three-shift workers.

Diurnal Variation in Mental Performance: A Study of Three-shift Workers

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Observational study reveals diurnal variation in mental performance among shift workers, indicating strong links to core temperature rhythms.

To examine diurnal variations in mental performance and physiological processes across three-shift workers.
Monitored three-shift workers across rotating shifts to track diurnal rhythms in cognitive and physical performance.
Evaluated diurnal cycles against documented variations in physiological markers, including core body temperature.
Demonstrated marked diurnal variation in physical processes, aligning with documented fluctuations in core body temperature.
Observed parallel rhythmic variations in workers' mental performance corresponding to the phase of diurnal bodily cycles.

Bjerner et al. (1955) studied this question.

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Observational study reveals diurnal variation in mental performance among shift workers, indicating strong links to core temperature rhythms.