Key result
Maximal maternal exertion was followed by 15 episodes of fetal bradycardia across 79 tests, compared to only 1 episode during 85 submaximal tests.
Why the study?
Does maternal exertion cause fetal bradycardia in pregnant women?
Population
45 pregnant women (mean age 29.0 ± 3.7 years; mean gestational age 25.2 ± 3.0 weeks)
Design
Cohort
Authors
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Maximal exertion may risk transient fetal hypoxia; hypothesis-generating for exercise thresholds and needs prospective trials before practice change.
Observational (n=45)
Does maternal exertion cause fetal bradycardia in pregnant women?
Brief submaximal maternal exercise does not affect fetal heart rate, whereas maximal exertion is frequently followed by fetal bradycardia, suggesting potential inadequate fetal gas exchange.
Marshall W. Carpenter (1988) conducted an observational in Pregnancy (n=45). Maximal maternal exertion vs. Submaximal maternal exertion was evaluated on Incidence of fetal bradycardia (heart rate <110 beats per minute for ≥10 s). Maximal maternal exertion was followed by 15 episodes of fetal bradycardia across 79 tests, compared to only 1 episode during 85 submaximal tests.
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