Document Detail

Fetal wellbeing may be compromised during strenuous exercise among pregnant elite athletes.
MedLine Citation:
PMID:  21393257     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To study fetal wellbeing and uteroplacental blood flow during strenuous treadmill running in the second trimester.
METHODS: Six pregnant Olympic-level athletes in endurance events aged 28-37 years and training 15-22 h per week before the pregnancy were tested once at 23-29 weeks of pregnancy. The women ran three to five submaximal workloads on a treadmill with approximately 60-90% of maximal oxygen consumption. The maternal-fetal circulation was assessed with Doppler ultrasound of the uterine and umbilical arteries before, during and after exercise.
RESULTS: Mean uterine artery volume blood flow was reduced to 60-80% after warming up and stayed at 40-75% of the initial value during exercise. Fetal heart rate (FHR) was within the normal range (110-160 bpm) as long as the woman exercised below 90% of maximal maternal heart rate (MHR). Fetal bradycardia and high umbilical artery pulsatility index (PI) occurred when the woman exercised more than 90% of maximal MHR and the mean uterine artery volume blood flow was less than 50% of the initial value. FHR and umbilical artery PI normalised quickly after stopping the exercise.
CONCLUSIONS: Exercise at intensity above 90% of maximal MHR in pregnant elite athletes may compromise fetal wellbeing.
Kjell Å Salvesen; Erlend Hem; Jorunn Sundgot-Borgen
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Publication Detail:
Type:  Journal Article     Date:  2011-03-10
Journal Detail:
Title:  British journal of sports medicine     Volume:  46     ISSN:  1473-0480     ISO Abbreviation:  Br J Sports Med     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-02-27     Completed Date:  2012-04-23     Revised Date:  2013-09-30    
Medline Journal Info:
Nlm Unique ID:  0432520     Medline TA:  Br J Sports Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  279-83     Citation Subset:  IM    
National Center for Fetal Medicine, Trondheim University Hospital (St Olav's Hospital), Trondheim, Norway.
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MeSH Terms
Bradycardia / embryology,  physiopathology
Exercise Test
Fetus / blood supply,  physiology*
Heart Rate, Fetal / physiology*
Pregnancy / physiology*
Pregnancy Trimester, Second
Pregnancy Trimester, Third
Running / physiology*
Ultrasonography, Prenatal
Umbilical Arteries / physiology*
Young Adult
Comment In:
Br J Sports Med. 2013 Sep;47(13):813-4   [PMID:  22872682 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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