Activity restriction for women with arrested preterm labor: a randomized controlled trial.

Background: In the past, some pregnant women have been recommended to be in activity restriction because of the presumed increased risk of preterm birth due to the increased release of catecholamines, which might stimulate myometrial activity, during exercise and aerobic activity.

Objective: This study aimed to test the hypothesis that in women with singleton pregnancy and arrested preterm labor, activity restriction would reduce the rate of preterm birth at <37 weeks of gestation.

Study Design: This was a parallel-group nonblinded randomized trial conducted at a single center in Italy.