Longitudinal changes in walking cadence across pregnancy and postpartum

Area of Science:

• Obstetrics and Gynecology
• Exercise Physiology
• Public Health

Background:

• Physical activity during pregnancy offers health benefits, yet adherence to guidelines is low.
• Traditional physical activity measurement is challenging; daily steps and stepping rate (cadence) are emerging metrics.
• Understanding changes in physical activity intensity is crucial for maternal health.

Purpose of the Study:

• To investigate changes in free-living step cadence throughout pregnancy and postpartum.
• To determine if step cadence differs between 20 weeks gestation, 32 weeks gestation, and 12 weeks postpartum.

Main Methods:

• A longitudinal study tracked 32 pregnant women using hip-worn accelerometers.
• Data collection occurred at 20 weeks gestation, 32 weeks gestation, and 12 weeks postpartum.
• Analysis included total daily steps, time in cadence ranges, and mean/peak cadences.

Main Results:

• Pregnant women took significantly fewer steps in the third trimester versus the second trimester and postpartum.
• Third-trimester women spent less time in moderate-to-vigorous physical activity (MVPA) based on cadence.
• Peak cadence was significantly lower in the third trimester compared to the second trimester.

Conclusions:

• Pregnant women exhibit reduced step counts and slower walking cadences in the third trimester.
• Both the total volume and intensity of physical activity are altered during pregnancy.
• These findings highlight the need for tailored physical activity recommendations during pregnancy.