Overview
- A large Danish analysis of more than 800,000 pregnancies used a job exposure model to estimate time spent bending forward, walking and standing and found higher miscarriage rates associated with those activities.
- The study reported that each extra hour of forward bending at about 30 degrees was tied to the largest per‑hour increase in risk, with smaller per‑hour increases for walking and standing.
- Researchers derived exposures by combining activity‑tracker measurements and expert job assessments, which let them study many pregnancies but left key individual factors unmeasured, such as smoking and some maternal health data.
- Risks were higher among women who had been off work in the weeks before the loss, and the authors stressed that uncertainty at high exposure levels and residual confounding mean the findings do not prove cause and effect.
- If replicated, the results could lead employers and health services to consider limiting prolonged bending, walking and standing in early pregnancy, though broader testing and stronger evidence are needed before formal guideline changes.