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Leisure-time physical activity does not fully explain the higher body mass index in irregular-shift workers

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Abstract

Purpose

To elucidate the influence of leisure-time physical activity on body mass index (BMI), appetite-related hormones, and sleep when working irregular shifts.

Methods

A cross-sectional study was undertaken of 57 male truck drivers, 31 irregular-shift workers and 26 day-shift workers. Participants completed the International Physical Activity Questionnaire and were assessed for BMI. Subjects also provided a fasting blood sample for analysis of appetite-related hormones and wore an actigraphy device for seven consecutive days.

Results

Although leisure-time physical activity (LTPA) was generally low (<150 min/week) in both groups, the irregular-shift workers were more physically active than day-shift workers (99 ± 166 vs. 23 ± 76 min/week, p < 0.01). In spite of this, mean BMI of irregular-shift workers was 2 kg/m2 greater than day-shift workers (28.4 ± 3.8 vs. 26.4 ± 3.6 kg/m2, p = 0.04). Mean leptin concentration was 61 % higher in irregular-shift workers (5,205 ± 4,181 vs. 3,179 ± 2,413 pg/ml, p = 0.04). Among obese individuals, irregular-shift workers had higher leptin concentration (p < 0.01) and shorter sleep duration (p = 0.01) than obese day-shift workers.

Conclusion

Elevated BMI was associated with high leptin and low ghrelin levels in this population of irregular-shift workers. No influence of LTPA on appetite-related hormones or sleep duration was found. We conclude that moderate LTPA is insufficient to attenuate the higher BMI associated with this type of irregular-shift work in truck drivers.

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Acknowledgments

We would like to thank the study volunteers and Professor Greg Atkinson (Health and Social Care Institute, Teesside University, Middlesbrough, UK) for his contribution in data analysis. E.C.M. was the recipient of a research fellowship from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil—National Counsel of Technological and Scientific Development) for her traineeship during collaborative work at Liverpool John Moores University, Liverpool, UK (Project 200388-2010-0) and for her Ph.D. studies in Brazil (Project 142261/2008-4). We would like to acknowledge funding from the CNPq (Project 474199/2008-8).

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The authors declare that they have no conflict of interest.

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Correspondence to Claudia Roberta Castro Moreno.

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Marqueze, E.C., Ulhôa, M.A. & Castro Moreno, C.R. Leisure-time physical activity does not fully explain the higher body mass index in irregular-shift workers. Int Arch Occup Environ Health 87, 229–239 (2014). https://doi.org/10.1007/s00420-013-0850-4

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  • DOI: https://doi.org/10.1007/s00420-013-0850-4

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