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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

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Analysis of Electrocardiograms and Behavior in Mice from Pregnancy to Lactation Period
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Maternal heart rate changes during labour.

N Söhnchen1, K Melzer, B Martinez de Tejada

  • 1Department of Obstetrics and Gynaecology, University Hospitals of Geneva and Faculty of Medicine, University of Geneva, Switzerland.

European Journal of Obstetrics, Gynecology, and Reproductive Biology
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

Physically inactive pregnant women utilize more of their heart rate reserve during labor. This increased cardiovascular strain may limit pushing efforts and heighten risks during childbirth.

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Area of Science:

  • Obstetrics and Gynecology
  • Cardiovascular Physiology
  • Maternal Health

Background:

  • Labor and delivery demand significant physiological effort from pregnant women.
  • Sedentary lifestyles and reduced aerobic fitness may compromise cardiovascular capacity during childbirth.
  • Lower aerobic fitness can decrease heart rate reserve, impacting labor exertion and safety.

Purpose of the Study:

  • To quantify maternal heart rate reserve during labor and delivery.
  • To investigate the relationship between habitual physical activity and heart rate reserve utilization in pregnant women.
  • To assess the implications of physical activity levels on cardiovascular strain during childbirth.

Main Methods:

  • Maternal heart rate reserve (maximum heart rate minus resting heart rate) was measured in 30 healthy pregnant women.
  • Habitual daily physical activity was assessed using the Pregnancy Physical Activity Questionnaire during the third trimester.
  • Data were analyzed to correlate physical activity levels with heart rate reserve utilization during labor and delivery.

Main Results:

  • Maternal heart rates during labor approached levels seen in moderate to heavy physical exercise.
  • During active pushing, 20% of women reached over 90% of their heart rate reserve.
  • Physically inactive women utilized a significantly greater percentage of their heart rate reserve (87%) compared to active women (65%).

Conclusions:

  • Increased heart rate reserve utilization in physically inactive women may limit pushing intensity and duration.
  • Higher cardiovascular strain in less active women during labor may elevate cardiovascular risks.
  • Promoting physical activity in pregnancy could be crucial for managing cardiovascular load during childbirth.