Effect of shift work on body mass index: results of a study performed in 319 glucose-tolerant men working in a Southern Italian industry

Oct 24, 2003International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity

How Shift Work Relates to Body Weight in 319 Healthy Men Working in Southern Italy

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Abstract

Shift workers had a higher body mass index (BMI) compared to day workers.

The prevalence of obesity was greater among shift workers than day workers.
Body fat distribution did not differ significantly between shift and day workers.
Shift work was associated with increased BMI, regardless of age and work duration.
Shift workers exhibited significantly higher systolic blood pressure levels.
The increase in systolic blood pressure may be mediated by greater body fatness.

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OBJECTIVE: To examine the influence of shift work on metabolic and cardiovascular risk factors in subjects working in an industry sited in Apulia, Southern Italy.

DESIGN: Cross-sectional study of metabolic effects of shift work in glucose tolerant workers in a chemical industry in southern Italy.

SUBJECTS: The subjects included 319 glucose tolerant male individuals, aged 35-60 y.

MEASUREMENTS: Anthropometric parameters (body mass index (BMI) and waist-to-hip ratio (WHR)), fasting concentrations of glucose, insulin, and lipids (total cholesterol, HDL-cholesterol, triglycerides), the sum of glucose levels during 75 g-oral glucose tolerance test (Sigma-OGTT), and systolic and diastolic blood pressure (SBP and DBP, respectively).

RESULTS: The prevalence of obesity was higher among shift workers compared to day workers, whereas body fat distribution was not different between the two groups. Shift workers had higher BMI than day workers, and shift working was associated with BMI, independently of age and work duration. Shift workers had significantly higher SBP levels, which were independently influenced by BMI, but not by shift work, thus suggesting that the difference in SBP may well be mediated by the increased body fatness.

CONCLUSION: In workers of an industry sited in Southern Italy, shift work may be directly responsible for increased body fatness and is indirectly associated with higher blood pressure levels and some features of metabolic syndrome.

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Effect of shift work on body mass index: results of a study performed in 319 glucose-tolerant men working in a Southern Italian industry

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