Main findings
In this large RCT, the intention-to-treat analysis showed no effect of a
supervised 12 weeks group exercise intervention on psychological
well-being measured by the WHO-5 at gestational weeks 29–34 (primary
outcome). Perprotocol analysis of women who attended ≥75% of the
exercise sessions showed a statistically significant higher WHO-5 mean
relative to controls at gestational weeks 29–34. Intriguingly, eight
weeks postpartum, women in the intervention group had a statistically
significant higher mean WHO-5 than women in the control group.