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Physical exertion at work and the risk of preterm delivery and small-for-gestational-age birth.
Obstet Gynecol. 2005 Dec; 106(6):1279-88.OG

Abstract

OBJECTIVE

To assess whether exposure to standing, lifting, night work, or long work hours during 3 periods of pregnancy are associated with an increased risk of preterm or small-for-gestational-age birth.

METHODS

The Pregnancy, Infection and Nutrition study is a prospective cohort with a nested case-control component that was conducted through clinic and hospital settings in Central North Carolina. A total of 1,908 women pregnant with a singleton gestation were recruited during prenatal visits from January 1995 through April 2000 and provided information during telephone and face-to-face interviews about physical exertion for the 2 longest-held jobs during pregnancy.

RESULTS

No significant elevations in preterm delivery were observed among women who lifted repeatedly or stood at least 30 hours per week, with no changes in risk estimates over the course of pregnancy. A 50% elevation in the risk of preterm delivery (relative risk 1.5, 95% confidence interval 1.0-2.0; first trimester) was observed among women who reported working at night (10:00 PM to 7:00 AM), whereas a 40% reduction in risk was observed among women working at least 46 hours per week (relative risk 0.6, 95% confidence interval 0.4-0.9; first trimester), regardless of period of exposure. No elevations in small-for-gestational-age birth were observed among women exposed to any of the 4 types of occupational exertion.

CONCLUSION

Physically demanding work does not seem to be associated with adverse pregnancy outcomes, whereas working at night during pregnancy may increase the risk of preterm delivery. Studies to examine the effect of shift work on uterine activity would help to clarify the possibility of a causal effect on preterm birth.

Authors+Show Affiliations

Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, USA. lisa.pompeii@uth.tmc.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

16319253

Citation

Pompeii, Lisa A., et al. "Physical Exertion at Work and the Risk of Preterm Delivery and Small-for-gestational-age Birth." Obstetrics and Gynecology, vol. 106, no. 6, 2005, pp. 1279-88.
Pompeii LA, Savitz DA, Evenson KR, et al. Physical exertion at work and the risk of preterm delivery and small-for-gestational-age birth. Obstet Gynecol. 2005;106(6):1279-88.
Pompeii, L. A., Savitz, D. A., Evenson, K. R., Rogers, B., & McMahon, M. (2005). Physical exertion at work and the risk of preterm delivery and small-for-gestational-age birth. Obstetrics and Gynecology, 106(6), 1279-88.
Pompeii LA, et al. Physical Exertion at Work and the Risk of Preterm Delivery and Small-for-gestational-age Birth. Obstet Gynecol. 2005;106(6):1279-88. PubMed PMID: 16319253.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Physical exertion at work and the risk of preterm delivery and small-for-gestational-age birth. AU - Pompeii,Lisa A, AU - Savitz,David A, AU - Evenson,Kelly R, AU - Rogers,Bonnie, AU - McMahon,Michael, PY - 2005/12/2/pubmed PY - 2006/2/24/medline PY - 2005/12/2/entrez SP - 1279 EP - 88 JF - Obstetrics and gynecology JO - Obstet Gynecol VL - 106 IS - 6 N2 - OBJECTIVE: To assess whether exposure to standing, lifting, night work, or long work hours during 3 periods of pregnancy are associated with an increased risk of preterm or small-for-gestational-age birth. METHODS: The Pregnancy, Infection and Nutrition study is a prospective cohort with a nested case-control component that was conducted through clinic and hospital settings in Central North Carolina. A total of 1,908 women pregnant with a singleton gestation were recruited during prenatal visits from January 1995 through April 2000 and provided information during telephone and face-to-face interviews about physical exertion for the 2 longest-held jobs during pregnancy. RESULTS: No significant elevations in preterm delivery were observed among women who lifted repeatedly or stood at least 30 hours per week, with no changes in risk estimates over the course of pregnancy. A 50% elevation in the risk of preterm delivery (relative risk 1.5, 95% confidence interval 1.0-2.0; first trimester) was observed among women who reported working at night (10:00 PM to 7:00 AM), whereas a 40% reduction in risk was observed among women working at least 46 hours per week (relative risk 0.6, 95% confidence interval 0.4-0.9; first trimester), regardless of period of exposure. No elevations in small-for-gestational-age birth were observed among women exposed to any of the 4 types of occupational exertion. CONCLUSION: Physically demanding work does not seem to be associated with adverse pregnancy outcomes, whereas working at night during pregnancy may increase the risk of preterm delivery. Studies to examine the effect of shift work on uterine activity would help to clarify the possibility of a causal effect on preterm birth. SN - 0029-7844 UR - https://www.unboundmedicine.com/medline/citation/16319253/Physical_exertion_at_work_and_the_risk_of_preterm_delivery_and_small_for_gestational_age_birth_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=16319253.ui DB - PRIME DP - Unbound Medicine ER -