The impact of physical activity during pregnancy on labor an
Physical activity in pregnancy is associated with decreased risks of adverse pregnancy outcomes such as gestational diabetes and preeclampsia. According to this study, more amount of physical activity leads to a shorter duration of active labor.

Researchers tested the hypothesis that higher levels of physical activity across different lifestyle domains in pregnancy are associated with a shorter duration of labor.

This is a secondary analysis of a prospective cohort study in which patients with singleton pregnancies without a major fetal anomaly were administered the Kaiser Physical Activity Survey (KPAS) in each trimester. The KPAS was designed specifically to quantify various types of physical activity in women and includes four summative indexes: housework/caregiving, active living habits, sports, and occupation.

Investigators included full-term gestations admitted for induction of labor or spontaneous labor. The primary outcome for this analysis was the duration of the 2nd stage of labor. Secondary outcomes were duration of active stage, prolonged 1st and 2nd stage, mode of delivery, rates of 2nd stage cesarean section, operative vaginal delivery, severe perineal lacerations, and postpartum hemorrhage. These outcomes were compared between patients with and without high physical activity levels, defined as overall KPAS score 75th percentile in the 3rd trimester. 811 patients were included. The median KPAS score was 9.5.

--203 patients had higher levels of physical activity in pregnancy.

--There was no difference in the duration of 2nd stage of labor between patients with and without higher physical activity levels.

--The duration of active labor was significantly shorter in patients with higher levels of physical activity.

--Patients with higher physical activity levels were significantly less likely to have a prolonged 1st stage.

--Rates of prolonged 2nd stage, cesarean section, operative vaginal deliveries, and perineal lacerations were similar between groups.

Conclusively, patients that are more physically active in pregnancy have a shorter duration of active labor.

Source: https://doi.org/10.1016/j.ajog.2021.05.036
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