title: Effects of lifetime exercise on the outcome of in vitro fertilization.
abstract: OBJECTIVE
  To estimate whether exercise before the first cycle of in vitro fertilization (IVF) affects cycle outcomes.
  
  
  METHODS
  A total of 2,232 patients were prospectively enrolled before undergoing their first cycle of IVF for the treatment of infertility from 1994-2003 at three IVF clinics in the greater Boston area. The primary IVF outcomes of interest included successful live birth and four points of cycle failure: cycle cancellation, failed fertilization, implantation failure, and pregnancy loss. Unconditional logistic regression adjusting for observed confounders was used to quantify the relation between self-reported exercise and cycle outcome.
  
  
  RESULTS
  In general, women who reported regular exercise were no more likely to have a live birth compared with those women who did not report exercise (odds ratio [OR] 0.8, 95% confidence interval [CI] 0.7-1.0; P = .07). Women who reported exercising 4 hours or more per week for 1-9 years were 40% less likely to have a live birth (OR 0.6, CI 0.4-0.8) and were almost three times more likely to experience cycle cancellation (OR 2.8, CI 1.5-5.3) and twice as likely to have an implantation failure (OR 2.0, CI 1.4-3.1) or pregnancy loss (OR 2.0, CI 1.2-3.4) than women who did not report exercise. In general, women who participated in cardiovascular exercise had a 30% lower chance of successful live birth (OR 0.7, CI 0.6-0.9) than women who reported no exercise.
  
  
  CONCLUSIONS
  Regular exercise before in vitro fertilization may negatively affect outcomes, especially in women who exercised 4 or more hours per week for 1-9 years and those who participated in cardiovascular exercise.
  
  
  METHODS
  II-2.
authors.affiliation: Department of Obstetrics and Gynecology, Brigham and Women's Hospital and Harvard Medical, Boston, Massachusetts, USA.
authors.forename: Stephanie N
authors.initials: SN
authors.lastname: Morris
authors.forename: Stacey A
authors.initials: SA
authors.lastname: Missmer
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Cramer
authors.forename: R Douglas
authors.initials: RD
authors.lastname: Powers
authors.forename: Patricia M
authors.initials: PM
authors.lastname: McShane
authors.forename: Mark D
authors.initials: MD
authors.lastname: Hornstein
mesh_terms: D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D050498:Live Birth; D015999:Multivariate Analysis; D011247:Pregnancy; D011446:Prospective Studies; D011795:Surveys and Questionnaires; D016896:Treatment Outcome