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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
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Circadian typology: a comprehensive review.

Ana Adan1, Simon N Archer, Maria Paz Hidalgo

  • 1Department of Psychiatry and Clinical Psychobiology, School of Psychology, University of Barcelona, Spain. aadan@ub.edu

Chronobiology International
|September 26, 2012
PubMed
Summary

Circadian typology (CT) significantly impacts health and disease, influencing biological and psychological functions. This review explores CT

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Area of Science:

  • Chronobiology and Sleep Science
  • Human Behavior and Individual Differences

Background:

  • Circadian typology (CT) is a recently studied individual difference with significant implications for health and disease.
  • Existing research indicates CT influences biological and psychological functioning.

Purpose of the Study:

  • To review the psychometric properties and validity of CT measures.
  • To examine individual, environmental, and genetic factors influencing CT.
  • To assess the implications of CT for shiftwork, jet lag, cognitive abilities, personality, and psychiatric disorders.

Main Methods:

  • Literature review of existing studies on circadian typology.
  • Analysis of biological markers (sleep-wake cycle, body temperature, cortisol, melatonin) differentiating CT groups.
  • Assessment of CT's impact on various functional domains and adjustment challenges.

Main Results:

  • CT measures show varying psychometric properties and validity.
  • Biological, environmental, and genetic factors demonstrably influence CT.
  • CT differences are associated with variations in cognitive function, personality, and psychiatric disorder incidence.
  • CT impacts adjustment to shiftwork and jet lag.

Conclusions:

  • CT is a crucial factor in human functioning, health, and disease.
  • Methodological limitations in current CT research need addressing.
  • Further research is needed to fully understand and integrate CT into professional practice.