(HealthDay News) – Moderate physical activity (PA) may improve fertility in all women, regardless of their weight.

In an effort to determine whether there is an association between leisure-time PA and a woman’s fecundity, Lauren A. Wise, ScD, of the Boston University School of Public Health, and colleagues conducted an Internet-based observational study involving 3,628 Danish women aged 18–40 who were planning a pregnancy.

In all but overweight and obese women (body mass index [BMI], ≥25kg/m²), the researchers found that time to pregnancy increased in a dose-response manner with increasing vigorous physical activity. However, moderate physical activity improved fecundity for all women, regardless of their BMI.

“Moderate PA was associated with a small increase in fecundability regardless of BMI,” the authors write. “These findings indicate that PA of any type might improve fertility among overweight and obese women, a subgroup at higher risk of infertility. Lean women who substitute vigorous PA with moderate PA may also improve their fertility.”

Full Text (subscription or payment may be required)