Correspondence to

Does exercise training during pregnancy infl uence fetal cardiovascular responses to an exercise stimulus? Insights from a randomised, controlled trial R Barakat,1 J R Ruiz,2 G Rodríguez-Romo,1 R Montejo-Rodríguez,3 A Lucia4 In this study, the effects of maternal physical activity level on several fetal haemodynamic parameters such as pulsatility index of the fetal middle cerebral and umbilical arteries and cerebral-to-fetal ratio, as well as on fetal heart rate responses to one bout of moderate exercise (20 min cycle-ergometry at ~60% of age-predicted maximum heart rate) during the third pregnancy trimester were assessed. 26 Sedentary and 26 physically active gravidae aged 29 (3) and 30 (2) years, respectively, were studied. Maternal exercise di