Physically demanding work, fetal growth and the risk of adverse birth outcomes. The Generation R Study

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Abstract

Objectives Work-related risk factors, such as long work hours, and physically demanding work have been suggested to adversely influence pregnancy outcome. The authors aimed to examine associations between various aspects of physically demanding work with fetal growth in different trimesters during pregnancy and the risks of adverse birth outcomes. Methods Associations between physically demanding work and fetal growth were studied in 4680 pregnant women participating in a population-based prospective cohort study from early pregnancy onwards in the Netherlands (2002-2006). Mothers who filled out a questionnaire during mid-pregnancy (response 77% of enrolment) were included if they conducted paid employment and had a spontaneously conceived singleton live born pregnancy. Questions on physical workload were obtained from the Dutch Musculosk Results There were no consistent significant associations between physically demanding work nor working hours in relation to small for gestational age, low birth weight or preterm delivery. Women exposed to long periods of standing had lower growth rates for fetal head circumference (HC), resulting in a reduction of approximately 1 cm (3%) of the average HC at birth. Compared with women working <25 h/week, women working 25-39 h/week and >40 h/week had lower growth rates for both fetal weight and Conclusion Long periods of standing and long working hours per week during pregnancy seem to negatively influence intrauterine growth.
Original languageUndefined/Unknown
Pages (from-to)543-550
Number of pages8
JournalOccupational and Environmental Medicine
Volume69
Issue number8
DOIs
Publication statusPublished - 2012

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