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Association Between Preterm Delivery and Pre-pregnancy Body Mass (BMI), Exercise and Sleep During Pregnancy Among Working Women in Southern California

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Abstract

Little is known about modifiable lifestyle factors beyond quitting smoking that could prevent preterm delivery (PTD, <37 weeks gestation). We examined the individual and joint associations of pre-pregnancy BMI, second trimester exercise and sleep on PTD. We conducted a nested, population-based case–control study interviewing postpartum 344 cases delivering at <37 weeks, as identified by clinical estimate of gestational age from prenatal screening records, and 698 term controls, excluding term low birthweight. Eligible women participated in California’s statewide Prenatal Screening Program, worked during pregnancy, and delivered a singleton birth in Southern California in 2002–2003. Modeled separately, moderate (odds ratio [OR] = 0.90; 95 % confidence interval [CI] = 0.84–0.96—per hour/week) and vigorous (OR = 0.67; 95 % CI = 0.46–0.98 for yes vs. no) exercise during the second trimester were associated with a reduced odds of PTD, and sleep duration was not (OR = 1.09, 95 % CI = 0.80–1.48 for <7 h; OR = 0.88, 95 % CI = 0.57–1.48 for >8 h vs. 7–8 h). When sleep and exercise variables were modeled together along with pre-pregnancy BMI, only moderate exercise (OR = 0.91; 95 % CI 0.85–0.98) continued to be associated with reduced odds of PTD. The benefits of moderate exercise appeared strongest for women with BMI greater than 24 kg/m2 (OR = 0.85; 95 % CI = 0.79–0.93) and weakened with decreasing BMI. No other interactions were found. Moderate exercise is associated with reduced PTD, particularly for women with BMI above the normal range. The results are of public health relevance given that these risk factors are potentially modifiable both pre-conceptionally and during pregnancy and rates of PTD are still high in the United States.

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Acknowledgments

This work was funded in part by the Maternal and Child Health Bureau, Division of Research, Training and Education, grant #R40MV00305-01 to SG. This study was also partially funded by NIH grant #R24MH081797, “Socioeconomic and Neuro-Endocrine Determinants of Perinatal Complications”. We thank Alan Hubbard PhD. for his helpful suggestions for data analysis.

Conflict of interest

None of the authors have competing financial interests in connection with the submitted manuscript.

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Authors and Affiliations

  1. Maternal and Child Health Program, School of Public Health, University of California, 207-J University Hall, Berkeley, CA, 94720, USA

    Sylvia Guendelman, Jessica L. Kosa & Barbara Abrams

  2. Sequoia Foundation, 850 Marina Bay Parkway, Richmond, CA, 94804, USA

    Michelle Pearl & Steve Graham

  3. California Department of Public Health, 850 Marina Bay Parkway, Richmond, CA, 94804, USA

    Martin Kharrazi

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  1. Sylvia Guendelman
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  2. Michelle Pearl
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Correspondence to Sylvia Guendelman.

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Guendelman, S., Pearl, M., Kosa, J.L. et al. Association Between Preterm Delivery and Pre-pregnancy Body Mass (BMI), Exercise and Sleep During Pregnancy Among Working Women in Southern California. Matern Child Health J 17, 723–731 (2013). https://doi.org/10.1007/s10995-012-1052-5

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