Fetal heart rate responses during maternal resistance exercise: a pilot study

Area of Science:

• Exercise Physiology
• Maternal-Fetal Medicine
• Cardiovascular Physiology

Background:

• Understanding fetal responses to maternal exercise is crucial for promoting safe physical activity during pregnancy.
• Resistance training is increasingly recognized for its health benefits, but its impact on fetal well-being requires investigation.

Purpose of the Study:

• To assess fetal heart rate (FHR) responses to maternal resistance exercise targeting upper and lower body muscle groups.
• To evaluate FHR changes at different gestational periods and exercise volumes.
• To determine FHR recovery 25 minutes post-exercise.

Main Methods:

• Ten pregnant women (22-36 weeks gestation) underwent resistance exercise sessions (leg extension, pec-deck fly) with varying set volumes.
• Fetal heart rate was monitored using a portable digital cardiotocograph during and after exercise.
• Statistical analysis included Student's t-test and ANOVA with repeated measures.

Main Results:

• No significant differences in FHR were observed between upper and lower body resistance exercises across all gestational periods.
• Exercise volume (1 vs. 3 sets) did not elicit significant changes in FHR.
• Fetal heart rate returned to baseline levels within 25 minutes post-exercise.

Conclusions:

• Maternal resistance exercise, as performed in this study, appears safe for the fetus.
• These findings support the safety of incorporating resistance training into prenatal fitness regimens.