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Related Experiment Videos

Dissecting circadian performance rhythms: implications for shiftwork

S Folkard1, P Totterdell, D Minors

  • 1MRC/ESRC Social & Applied Psychology Unit, The University, Sheffield, UK.

Ergonomics
|January 1, 1993
PubMed
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Shift work safety relies on adjusting circadian rhythms. Different tasks adjust at varying rates, suggesting optimal shift systems depend on specific job demands.

Area of Science:

  • Chronobiology
  • Human Performance
  • Occupational Safety

Background:

  • Shift work systems require effective adjustment of shiftworkers' circadian rhythms for optimal performance and safety.
  • The interplay between endogenous (body clock) and exogenous (masking) factors influences the adaptability of these rhythms.

Purpose of the Study:

  • To estimate the relative contributions of endogenous and exogenous components to circadian rhythmicity in performance.
  • To investigate how different performance measures adjust to altered time structures, specifically a 30-hour day.

Main Methods:

  • Three volunteers lived on a 30-hour 'day' schedule.
  • A range of performance tasks were administered every 2 hours while awake.
  • Analysis focused on differentiating endogenous and exogenous rhythm components.

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Main Results:

  • Significant differences were observed in the rhythmicity of various performance tasks.
  • Speed on a 4-choice serial reaction time task was primarily endogenously driven.
  • Performance on a 5-target Sternberg task showed greater dependence on exogenous 30-hour factors.

Conclusions:

  • Performance measures exhibit differential adjustment rates to night work.
  • The optimal shift system design may need to be task-specific due to varying rhythm adjustment dynamics.