We assessed the effects of maternal physical activity level on several fetal haemodynamics parameters such as pulsatility index of the fetal middle cerebral (MCA-PI) and umbilical artery (UA-PI), and cerebral to fetal ratio (CPR), as well as on fetal heart rate (FHR) responses to one-bout of moderate exercise (20-min cycle-ergometry at ~60% of age-predicted maximum heart rate) during the third pregnancy trimester. We studied 26 sedentary and 26 physically active gravidae aged 29(3) and 30(2) years respectively. Maternal exercise did not have a deleterious effect on fetal haemodynamics (particularly, CPR remained within normal limits with exercise). Overall, maternal training status did not influence the fetal cardiovascular variables we studied.
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