title: A longitudinal study of maternal oxygen saturation during short-term submaximal exercise.
abstract: OBJECTIVE
  Longitudinal prospective study before, during and after normal pregnancy of the effect of short-term submaximal exercise on maternal oxygen saturation.
  
  
  METHODS
  Fourteen healthy women were recruited to the study before a planned pregnancy, and were followed seven times during the pregnancy and for up to 6 month after delivery. A submaximal bicycle exercise test with a target heart rate of 85% of the predicted age-adjusted maximum was performed. Maternal oxygen saturation was continuously recorded using a pulse oximeter.
  
  
  RESULTS
  Maternal oxygen saturation at maximum work-load had increased significantly already at 8 weeks gestation compared with preconception levels, and remained at a significantly higher level until 29 weeks of gestation. Thereafter, the oxygen saturation continued to be higher even at 6 month postpartum. During the exercise test, the lowest saturation was found during the late recovery period, this remained unchanged before, during and after pregnancy.
  
  
  CONCLUSIONS
  A pregnant woman responds to short-term exercise by increasing the oxygen saturation until 29 weeks. After that, the saturation level decreases but remains at a higher level even 6 month after delivery compared with preconception levels.
authors.affiliation: Department of Obstetrics and Gynecology, University of Lund, Sweden. jouko.pirhonen@ioks.uio.no
authors.forename: Jouko P
authors.initials: JP
authors.lastname: Pirhonen
authors.forename: Pelle G
authors.initials: PG
authors.lastname: Lindqvist
authors.forename: Karel
authors.initials: K
authors.lastname: Marsal
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D008137:Longitudinal Studies; D010100:Oxygen / Q000097:blood*; D049590:Postpartum Period / Q000097:blood; D011247:Pregnancy / Q000097:blood*; D011446:Prospective Studies; D013997:Time Factors
chemical_list: D010100:Oxygen