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Am J Obstet Gynecol. 2001 Feb;184(3):403-8.

Recreational exercise and occupational activity during pregnancy and birth weight: a case-control study.

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  • 1Department of Epidemiology and Biostatistics, The University of Western Ontario, London, Canada.

Abstract

OBJECTIVE:

Our purpose was to investigate the impact of exercise and occupational activity on birth weight.

STUDY DESIGN:

This case-control study involved singleton infants at > or = 34 weeks' gestation without congenital anomalies. Case subjects had birth weights at <15th percentile for gestational age, and 2 control subjects were selected per case subject. Data were collected by self-completed questionnaire and analyzed by means of logistic regression.

RESULTS:

Relative to those who participated in structured exercise 3 or 4 times per week during the third trimester, the odds of lower birth weight were substantially increased for those who exercised > or = 5 times per week (adjusted odds ratio, 4.61; 95% confidence interval, 1.73-12.32) and modestly increased for those at the other extreme, who engaged in structured exercise < or = 2 times per week (adjusted odds ratio, 2.64; 95% confidence interval, 1.29-5.39). Other factors of importance to birth weight were maternal height, prepregnancy body mass, pregnancy weight gain, smoking in the third trimester, and nulliparity.

CONCLUSIONS:

Structured exercise frequency during late pregnancy is a determinant of birth weight.

PMID:
11228494
DOI:
10.1067/mob.2001.109392
[PubMed - indexed for MEDLINE]
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