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Related Experiment Video

Updated: May 19, 2026

Swimming Exercise Protocol and Care Methods for Pregnant Rats

Swimming Exercise Protocol and Care Methods for Pregnant Rats

Published on: April 5, 2024

Strenuous exercise during pregnancy: is there a limit?

Linda M Szymanski¹, Andrew J Satin

¹Division of Maternal-Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

American Journal of Obstetrics and Gynecology

|September 4, 2012

Summary

This summary is machine-generated.

Pregnant women can engage in strenuous exercise, but highly active individuals should monitor fetal well-being. Transient fetal heart rate changes may occur in elite athletes, though overall outcomes remain reassuring.

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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans

Published on: October 17, 2018

Area of Science:

Obstetrics and Gynecology
Sports Medicine
Fetal Physiology

Background:

Maternal physical activity during pregnancy is common.
The effects of strenuous exercise on fetal well-being require careful evaluation.
Understanding fetal responses across different activity levels is crucial.

Purpose of the Study:

To assess fetal responses to strenuous exercise in pregnant women with varying activity levels.
To compare fetal well-being markers between active and inactive pregnant women post-exercise.
To identify potential risks associated with strenuous exercise in athletic pregnancies.

Main Methods:

Studied 45 healthy pregnant women (nonexercisers, regular, and highly active).
Performed peak treadmill tests between 28-32 weeks' gestation.
Evaluated fetal well-being using umbilical artery Doppler, fetal heart rate/tracing, and biophysical profile (BPP) pre- and post-exercise.

Main Results:

Umbilical and uterine artery Doppler indices remained stable across all groups post-exercise.
Biophysical profiles and fetal heart tracings were reassuring in all participants.
Five highly active women experienced transient fetal heart rate decelerations and Doppler changes immediately after exercise.

Conclusions:

Short-duration, strenuous exercise appears safe for fetal well-being in most pregnant women.
Highly active women may experience temporary fetal heart rate and Doppler changes post-exercise.
The threshold for exercise intensity potentially compromising fetal well-being in athletes is unknown.