We have previously found that the fetal heart rate remains normal when the mother performs short high-intensity intervals (30 sec).

We are now investigating the fetus' pulse and blood flow distribution during and immediately after a single high-intensity interval training session in pregnant women.

The aim of the study is to establish a time-efficient and safe way to exercise for pregnant women and to gain insight into some of the mechanisms of the beneficial effects of maternal exercise on fetal health and well being.

We still need participants for this study. Participation in the study involves performing one single interval session on a stationary bike at the Women's Clinic, St. Olavs Hospital. Before and immediately after the exercise session, an experienced obstetrician will perform ultrasound measurements of standard fetal bio metric measurements and blood flow to the different organs in the fetus. We will also measure the mother's heart rate, blood pressure, and body composition.

The project is undertaken at Faculty of Medicine and Health Sciences, NTNU and is approved by The Regional Committee for Medical and Health Research Ethics.

You are not eligible for participation in the study if:

• You have high blood pressure
• Gestational diabetes mellitus
• Any contraindications to exercise training during pregnancy

Inclusion criteria

• Over 18 and pregnant in week 32-36
• Pregnant with one fetus
• No known diseases
• Capable of cycling on an ergo-meter bike