American Journal of Epidemiology Vol. 147, No. 7: 628-635
Copyright © 1998 by The Johns Hopkins University School of Hygiene and Public Health
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Effects of Physical Activity on Preterm Birth
1 Department of Maternal and Child Health, Johns Hopkins University School of Hygiene and Public Health Baltimore, MD
2 Johns Hopkins University School of Nursing Baltimore, MD
3 Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine Baltimore, MD
Reprint requests to Department of Maternal and Child Health, Johns Hopkins University School of Hygiene and Public Health, 624 N. Broadway, Hampton House, Room 195, Baltimore, MD 21205.
The authors conducted a cohort study of low income women to determine the effect of physical activity on the risk of preterm birth. Women were sampled prenatally from four clinic sites and were scheduled for delivery at the University of Maryland Medical Systems (UMMS). Women who delivered infants at UMMS but who had received no prenatal care were also eligible. Preterm delivery was defined as a delivery prior to 37 completed weeks gestation. After adjusting for confounders, the odds of preterm delivery were increased for women who climbed stairs 
10 times per day (odds ratio (OR) = 1.60, 95% confidence interval 1.05–2.46) and for women who engaged in purposive walking 4 days per week (OR = 2.10, 95% CI 1.38–3.20). Leisure-time exercise (60 days in the first and second trimesters combined) had a protective effect on preterm delivery (OR = 0.51, 95% CI 0.27–0.95). Television viewing had a U-shaped relation with preterm delivery (ORs (95% CI): <15 hours, 2.09 (1.21–3.61); 29–42 hours, 1.50 (0.84–2.67); >42 hours, 3.05 (1.75–5.40)). While the results support current recommendations regarding leisure-time activities, activities of daily living appear to increase risk of preterm delivery among low income women. These findings and those for television watching warrant further investigation. Am J Epidemiol 1998; 147: 628–35.
infant, premature; physical activity
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