Exercise during pregnancy and risk of late preterm birth, cesarean delivery, and hospitalizations.
BACKGROUND
Federal physical activity guidelines recommend at least 150 minutes of moderate-intensity exercise per week during pregnancy. We studied whether regular exercise during pregnancy is associated with preterm birth, cesarean delivery, and hospitalization during pregnancy.


METHODS
Self-reported weekly exercise was ascertained in 3,006 women during the third trimester of pregnancy. Using multivariable logistic regression, we report the relationship between regular exercise (≥150 min/wk) and late preterm birth, cesarean delivery, and hospitalization during pregnancy, controlling for age, race, marital status, education, poverty status, prepregnancy body mass index weight category, gestational weight gain, and prepregnancy diabetes or hypertension.


RESULTS
Nearly one third of women reported meeting current federal physical activity recommendations during pregnancy. Five percent had late preterm birth, 29% had cesarean deliveries, and 20% reported hospitalization during pregnancy. In multivariable analysis, regular exercise during pregnancy was not associated with late preterm birth or hospitalization during pregnancy. Physical activity of 150 or more minutes per week was associated with reduced odds of cesarean delivery compared with less than 60 minutes per week, but the finding was not significant (adjusted odds ratio, 0.86; 95% confidence interval, 0.69-1.07).


CONCLUSIONS
In the First Baby Study, physical activity was not associated with late preterm birth or hospitalizations, and may be associated with decreased odds of cesarean delivery.
Department of Medicine, MidState Medical Center, Meriden, Connecticut.
Jennifer
J
Tinloy
Division of General Internal Medicine, Penn State College of Medicine, Hershey, Pennsylvania. Electronic address: cchuang@hmc.psu.edu.
Cynthia H
CH
Chuang
Department of Public Health Sciences, Penn State College of Medicine, Hershey, Pennsylvania.
Junjia
J
Zhu
Department of Obstetrics and Gynecology, Penn State University College of Medicine, Hershey, Pennsylvania.
Jaimey
J
Pauli
Division of General Internal Medicine, H034, Penn State College of Medicine, Hershey, Pennsylvania.
Jennifer L
JL
Kraschnewski
Departments of Public Health Sciences & Obstetrics and Gynecology, Penn State College of Medicine, Hershey, Pennsylvania.
Kristen H
KH
Kjerulff
D000328:Adult; D015992:Body Mass Index; D002585:Cesarean Section / Q000706:statistics & numerical data*; D015444:Exercise; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007231:Infant, Newborn; D016015:Logistic Models; D008137:Longitudinal Studies; D015999:Multivariate Analysis; D016017:Odds Ratio; D011247:Pregnancy; D011256:Pregnancy Outcome; D047928:Premature Birth; D011295:Prenatal Care / Q000706:statistics & numerical data; D012307:Risk Factors; D012959:Socioeconomic Factors; D013997:Time Factors; D015430:Weight Gain; D055815:Young Adult