Effects of Exercise-Based Interventions on Neonatal Outcomes: A Meta-Analysis of Randomized Controlled Trials.

Objective: The aim of this study was to conduct a systematic review and meta-analysis of randomized controlled clinical trials (RCTs) assessing the influence of physical exercise interventions during pregnancy on some neonatal outcomes.

Data Source: Key words were used to conduct a computerized search in six databases: Cochrane Library Plus, Science Direct, EMBASE, PubMed, Web of Science, and ClinicalTrials.gov.

Study Inclusion And Exclusion Criteria: RCTs that included an exercise program for healthy pregnant women who were sedentary or had low levels of physical activity were selected.

Data Extraction: Two independent reviewers extracted data and assessed the quality of the studies included. Of 4296 articles retrieved, 14 RCTs (3044 pregnant women) met the inclusion criteria.

Data Synthesis: Pooled effect sizes (ESs) were calculated using a fixed model.

Results: Overall, physical exercise programs during pregnancy produced a small reduction in neonatal birth weight (ES = -.10; p = .04). The Apgar score at 1 minute was also weakly increased with combined exercise (aerobic, strength, and flexibility) (ES = .09; p = .048) and no differences between groups were observed in gestational age at delivery and Apgar score at 5 minutes.

Conclusion: Structured physical exercise programs during pregnancy appear to be safe for the neonate, mainly favoring a lower birth weight within normal range. However, more studies are needed to establish recommendations.