Cited by 924Sleep and Work-Related FatigueCircadian rhythm and melatoninWorkplace Health and Well-being

Is there an association between shift work and having a metabolic syndrome? Results from a population based study of 27 485 people

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Karlsson, B, Knutsson, A, Lindahl, B·2001·Occupational and Environmental Medicine

Abstract

OBJECTIVES: To explore how metabolic risk factors for cardiovascular disease (CVD) differ between shift workers and day workers in a defined population. Shift work has been associated with an increased risk of CVD. Risk factors and causal pathways for this association are only partly known. METHODS: A working population of 27 485 people from the Västerbotten intervention program (VIP) has been analysed. Cross sectional data, including blood sampling and questionnaires were collected in a health survey. RESULTS: Obesity was more prevalent among shift workers in all age strata of women, but only in two out of four age groups in men. Increased triglycerides (>1.7 mmol/l) were more common among two age groups of shift working women but not among men. Low concentrations of high density lipoprotein (HDL) cholesterol (men<0.9 and women<1.0 mmol/l) were present in the youngest age group of shift workers in both men and women. Impaired glucose tolerance was more often found among 60 year old women shift workers. Obesity and high triglycerides persisted as risk factors in shift working men and women after adjusting for age and socioeconomic factors, with an OR of 1.4 for obesity and 1.1 for high triglyceride concentrations. The relative risks for women working shifts versus days with one, two, and three metabolic variables were 1.06, 1.20, and 1.71, respectively. The corresponding relative risks for men were 0.99, 1.30, and 1.63, respectively. CONCLUSIONS: In this study, obesity, high triglycerides, and low concentrations of HDL cholesterol seem to cluster together more often in shift workers than in day workers, which might indicate an association between shift work and the metabolic syndrome.

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  • Shift work is an independent risk factor for many chronic conditions, including heart disease.

    “Shift work is an independent risk factor for many chronic conditions, including heart disease (133-136), perhaps due to recurring disruptions of the circadian clock itself (e.g., light exposure at unusual circadian phases), or perhaps due to misalignment between the circadian clock and the behaviors (e.g., sleeping and fasting during the day, and being active and eating across the night).”

    From Role of the circadian system in cardiovascular disease (2018) · cites this paper as [134]

  • Night shift workers tend to have a higher prevalence of overweightness, abdominal obesity, elevated triglycerides, dyslipidemia, impaired glucose tolerance, and decreased kidney function compared to day workers.

    “For example, it has been shown that night shift workers tend to have a higher prevalence of overweightness, abdominal obesity [20], elevated triglycerides, dyslipidemia, impaired glucose tolerance [21,22,23,24,25], and decreased kidney function [26] compared to day workers.”

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Research works printed but not linked: 5

  1. Bøggild H, Knutsson A. Shiftwork, risk factors and cardio- vascular disease. Scand J Work Environ Health 1999;25:85- 99.
  2. Hampton SM, Morgan LM, Lawrance N, et al. Postprandial hormone and metabolic responses in simulated shiftwork. J Endocrinol 1996;151:257-67.
  3. van Amelsvoort L. Cardiovascular risk profile in shift workers [thesis]. Wageningen: Wageningen University, 2000.
  4. Tenkanen L, Sjöblom T, Kalimo R, et al. Shiftwork, occupa- tion and coronary heart disease over 6 years follow up in the Helsinki Heart Study. Scand J Work Environ Health 1997;23:257-65.
  5. Groop L. Genetic and metabolic heterogeneity of diabetes. International Diabetes Monitor 2000;12:1-6.

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Authors
Karlsson, B., Knutsson, A., & Lindahl, B.
Affiliations
Umeå University (SE)
Corresponding author
Karlsson, B
Venue
Occupational and Environmental Medicine
Publisher
BMJ
Published
2001-11-01
Volume
58
Issue
11
Pages
747-752
ISSN
  • 0007-1072 (ISSN-L)
  • 1351-0711
  • 1470-7926
OpenAlex
W2115505876
Cited by
924
References
24
Citations by year
2026: 16 · 2025: 19 · 2024: 16 · 2023: 30 · 2022: 41 · 2021: 45 · 2020: 47 · 2019: 49 · 2018: 49 · 2017: 50 · 2016: 55 · 2015: 81 · 2014: 56 · 2013: 61 · 2012: 60
FWCI
8.49
Type
journal article
Language
en
Open access
Locations
  • Occupational and Environmental Medicine (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Health Professions › General Health Professions › Workplace Health and Well-being
Keywords
shift work, metabolic syndrome, cardiovascular risk factors, obesity, triglycerides, HDL cholesterol, impaired glucose tolerance, sex differences
MeSH terms
Adult, Cardiovascular Diseases, Circadian Rhythm, Cross-Sectional Studies, Female, Humans, Cholesterol, HDL, Male, Metabolic Diseases, Middle Aged, Obesity, Risk Factors, Sex Factors, Syndrome, Triglycerides, Work Schedule Tolerance, Age Distribution, Sex Distribution

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