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Circadian performance rhythms: some practical and theoretical implications.

S Folkard1

  • 1MRC/ESRC Social and Applied Psychology Unit, University of Sheffield, U.K.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 12, 1990
PubMed
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Human diurnal rhythms and circadian clocks explain low night safety and productivity. Shift work adjustment is poor, suggesting a need for a dedicated nocturnal society for critical safety roles.

Area of Science:

  • Chronobiology
  • Human physiology
  • Occupational health

Background:

  • Humans are diurnal, with physiological processes and performance exhibiting predictable circadian rhythms influenced by endogenous body clocks and exogenous factors.
  • Performance capabilities fluctuate throughout the waking day, affected by task demands and adjustments to altered sleep schedules, such as those in shift work.

Purpose of the Study:

  • To investigate the reasons for reduced safety and productivity during night work.
  • To examine the endogenous and exogenous components of circadian rhythms and their impact on performance and adjustment to shift work.

Main Methods:

  • Analysis of performance capabilities and circadian rhythm components in relation to shift work.
  • Modeling of endogenous and exogenous circadian rhythm factors.

Related Experiment Videos

  • Re-examination of evidence regarding shiftworker adjustment to night shifts.

    • Main Results:

    • Shiftworkers often do not fully adjust to night shifts, instead tending to 'stay up late', which contributes to reduced safety.
    • Memory-loaded performance may have an endogenous component distinct from simpler performance metrics.
    • Exogenous components of circadian rhythms can vary across different performance measures.

    Conclusions:

    • Inadequate adjustment to night shifts, rather than a complete lack of adjustment, is a primary cause of decreased safety.
    • For safety-critical roles, establishing a 'nocturnal sub-society' that consistently works and maintains a nocturnal routine, even on rest days, may be the most effective solution.