“…More recent investigations of FHR responses to maternal exercise have used healthy women and animals to determine if exercise is a hypoxic stress to a healthy fetus. Overall, FHR after exercise of moderate intensity is either unchanged 16,41,43,74–76 or increased significantly 6,12,18,36,50,53,57,77 . In one series, FHR required an average of 22 minutes to return to baseline after exercise 53 .…”