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Exercise During Pregnancy and the Gestational Age Distribution: A Cohort Study.
MedLine Citation:
PMID:  22143108     Owner:  NLM     Status:  Publisher    
PURPOSE: To examine the associations between exercise performed at different time points during pregnancy and gestational age in a population based cohort study. METHODS: Data included 61,098 singleton pregnancies enrolled between 2000 and 2006 in the Norwegian Mother and Child Cohort Study (MoBa), conducted by the Norwegian Institute of Public Health. Self-reported exercise was collected from two questionnaires in pregnancy weeks 17 and 30. Gestational age was determined based on expected date of delivery according to ultrasound, as registered in the Medical Birth Registry of Norway. We used logistic regression to analyze preterm (<37 completed weeks) and post-term birth (≥42 weeks). Comparison of mean gestational age (GA) by exercise levels were estimated by general linear model. RESULTS: Mean GA for women exercising 3-5 times a week in week 17 was 39.51 (95% CI 39.48-39.54) compared to 39.34 (39.30-39.37) completed weeks for non-exercisers (p<0.001). Mean differences remained for all categories of exercise after adjusting for confounding with the greatest mean difference between exercising 3-5 times per week in week 17 and non-exercisers (equals 1 day). Similar mean differences in GA were observed by exercise levels in week 30. The greatest protective effect on risk of preterm birth were observed for women exercising 3-5 times a week in weeks 17 or 30 (aOR=0.82; 95% CI 0.73-0.91; and 0.74; 0.65-0.83, respectively) compared to non-exercisers. Whereas, women exercising 1-2 or 3-5 times per week in week 17, were slightly more likely to have a post-term birth (aOR=1.14;1.04-1.24; aOR=1.15;1.04-1.26, respectively). Mean GA did not differ by type of exercise performed during pregnancy. CONCLUSION: Exercise performed during pregnancy shifted the gestational age distribution slightly upwards resulting in reduced preterm births and slightly increased post-term births.
Katrine Mari Owe; Wenche Nystad; Rolv Skjaerven; Hein Stigum; Kari Bø
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-2
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Department of Sport Medicine, Norwegian School of Sport Sciences, Oslo, Norway, 2Department of Chronic Diseases, Norwegian Institute of Public Health, Oslo, Norway, 3Department of Public Health and Primary Health Care, Section for Epidemiology and Medical Statistics, University of Bergen, Bergen, Norway, and 4Medical Birth Registry of Norway, Norwegian Institute of Public Health, Bergen, Norway.
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