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Twins under shift work: a case study of sleep log data

K Fukuda1

  • 1Department of Educational Psychology, Faculty of Education, Fukushima University, Japan. kfukuda@educ.fukushima-u.ac.jp

Perceptual and Motor Skills
|June 1, 1997
PubMed
Summary

This study found that monozygotic twins showed more similar sleep patterns, including rising times and circadian rhythms, than dizygotic twins, even under shift work. Genetic factors influence circadian rhythm characteristics.

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Area of Science:

  • Chronobiology
  • Human Genetics
  • Sleep Science

Background:

  • Circadian rhythms govern sleep-wake cycles and are influenced by genetics.
  • Shift work disrupts natural sleep patterns and can impact health.
  • Understanding genetic influences on circadian rhythms is crucial for adapting to work schedules.

Purpose of the Study:

  • To investigate the genetic influence on circadian rhythm characteristics in twins under shift work.
  • To compare sleep patterns and circadian rhythm parameters between monozygotic (MZ) and dizygotic (DZ) twins.
  • To assess the detectability of genetic control in circadian rhythm phase and amplitude despite shift work constraints.

Main Methods:

  • Utilized sleep logs from two pairs of female twins (one MZ, one DZ) over 30 days.
  • Analyzed rising and bedtime data, Morningness-Eveningness scores, and circadian rhythm amplitude via autocorrelation.
  • Compared within-pair similarities in sleep parameters across different work shifts and holidays.

Main Results:

  • Monzygotic twins exhibited more similar rising times, particularly during morning shifts, and greater similarity in Morningness-Eveningness scores and circadian rhythm amplitude compared to dizygotic twins.
  • Rising time similarity was higher in MZ twins during afternoon shifts and holidays, though their bedtimes varied.
  • Circadian rhythm characteristics, including phase and amplitude, showed greater similarity in MZ twins.

Conclusions:

  • Genetic factors significantly influence the phase and amplitude of circadian rhythms, as evidenced by greater similarity in monozygotic twins.
  • These genetic influences on circadian rhythms may remain detectable even when individuals are subjected to the constraints of shift work.
  • Further research can explore the specific genetic underpinnings of circadian rhythm adaptability in shift workers.

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