Physical activity during pregnancy and the risk of gestational diabetes mellitus: a systematic review and meta-analysis of randomised controlled trials.

Objectives: We performed a systematic review and meta-analysis to assess the effects of physical activity in preventing gestational diabetes mellitus (GDM).

Search Strategy: We searched the literature in six electronic databases and bibliographies of relevant articles.

Selection Criteria: We included randomised controlled trials on pregnant women who did not have GDM and other complications previously and had increased physical activity as the only intervention.