title: Exposure analysis methods impact associations between maternal physical activity and cesarean delivery.
abstract: BACKGROUND
  Previous studies report conflicting results regarding a possible association between maternal physical activity (PA) and cesarean delivery.
  
  
  METHODS
  Seven-day PA recalls were collected by telephone from pregnant women (n = 1205) from North Carolina, without prior cesarean, during 2 time windows: 17 to 22 weeks and 27 to 30 weeks completed gestation. PA was treated as a continuous, nonlinear variable in binomial regressions (log-link function); models controlled for primiparity, maternal contraindications to exercise, preeclampsia, pregravid BMI, and percent poverty. We examined both total PA and moderate-to-vigorous PA (MVPA) at each time. Outcomes data came from medical records.
  
  
  RESULTS
  The dose-response curves between PA or MVPA and cesarean risk at 17 to 22 weeks followed an inverse J-shape, but at 27 to 30 weeks the curves reversed and were J-shaped. However, only (total) PA at 27 to 30 weeks was strongly associated with cesarean risk; this association was attenuated when women reporting large volumes of PA (> 97.5 percentile) were excluded.
  
  
  CONCLUSIONS
  We did not find evidence of an association between physical activity and cesarean birth. We did, however, find evidence that associations between PA and risk of cesarean may be nonlinear and dependent on gestational age at time of exposure, limiting the accuracy of analyses that collapse maternal PA into categories.
authors: College of Public Health and Human Sciences, Oregon State University, Corvallis, OR.
authors: Marit L
authors: ML
authors: Bovbjerg
authors: Anna Maria
authors: AM
authors: Siega-Riz
authors: Kelly R
authors: KR
authors: Evenson
authors: William
authors: W
authors: Goodnight
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data*; D015331:Cohort Studies; D003625:Data Collection; D015444:Exercise; D005260:Female; D005865:Gestational Age; D006801:Humans; D009657:North Carolina; D011247:Pregnancy; D011446:Prospective Studies; D012107:Research Design