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Interaction between Shift Work and Established Coronary Risk Factors.

Jonas Hermansson1, Henrik Bøggild2, Johan Hallqvist3

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The International Journal of Occupational and Environmental Medicine
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Shift work interacts with physical inactivity in men and with high waist-hip ratio and elevated triglycerides in women, increasing myocardial infarction risk. These findings highlight crucial interactions for cardiovascular disease prevention in shift workers.

Keywords:
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Area of Science:

  • Cardiology
  • Occupational Health
  • Epidemiology

Background:

  • Shift work is linked to higher cardiovascular disease (CVD) risk.
  • The exact mechanisms and interactions with existing risk factors remain unclear.
  • Investigating potential synergistic effects between shift work and coronary risk factors is crucial.

Purpose of the Study:

  • To analyze the interaction effects of work schedules and established coronary artery disease risk factors on myocardial infarction (MI) risk.
  • To quantify the combined impact of shift work and risk factors on MI incidence.

Main Methods:

  • A case-control study (SHEEP/VHEEP) in Sweden involving 4648 participants aged 45-70.
  • Analysis included first-time MI cases and controls stratified by sex and age.
  • Synergy index (SI) was employed to assess interaction effects.

Main Results:

  • Male shift workers showed an interaction between shift work and physical inactivity (SI=2.05).
  • Female shift workers exhibited interaction effects with high waist-hip ratio (SI=4.0) and elevated triglycerides (SI=5.69).
  • These interactions significantly increased the risk of myocardial infarction.

Conclusions:

  • Shift work exhibits significant interactions with specific coronary risk factors.
  • Physical inactivity, high waist-hip ratio, and elevated triglycerides potentiate the cardiovascular risk associated with shift work.
  • Findings underscore the importance of considering combined risk factor management for shift workers.