Exercise in complicated pregnancies: no harm found in small study

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Inclusion Criteria - FGR population * Age 18-45 * Intrauterine pregnancy with diagnosis of fetal growth restriction (FGR) as defined by total estimated fetal weight \<10%ile for EGA or abdominal circumference \<10%ile for EGA * Diagnosis of FGR at any point in gestation (preference given for inclusion of those diagnosed with FGR after 32w0d) * Gestational age between 28w0d and 36w6d at time of intervention (based on sure last menstrual period (LMP) confirmed by first or second trimester ultrasound or unsure LMP with first trimester ultrasound) * Compliant with standard prenatal care Inclusion Criteria - Average for gestational age (AGA) population * Age 18-45 * Intrauterine pregnancy with normal estimated fetal growth (EFW \>10%ile and \<90%ile) * Gestational age between 28w0d and 36w6d at time of intervention with accurate dating (based on sure LMP confirmed by ultrasound prior to 22 weeks or unsure LMP with first trimester ultrasound) * Compliant with standard prenatal care Exclusion Criteria: * Exclusion Criteria - FGR population * Known contraindication to completion of 30 minutes of moderate intensity exercise * Fetal umbilical artery with elevated S/D ratio or absent or reversed diastolic flow * BMI \>40 * Severe maternal anemia (Hb less than 8.0) * Placenta previa * 2nd or 3rd trimester vaginal bleeding * Preterm premature rupture of membranes * Cervical insufficiency * Multi-fetal gestation * Oligohydramnios * Hypertensive disorder requiring antihypertensive medication * Blood pressure \>140/90 on the day of the study visit prior to exercise * Tobacco use * Opioid agonist therapy * Known fetal chromosomal anomaly, structural anomaly or infection * Inability or unwillingness of subject to give informed consent * Current psychiatric illness/social situation that would limit compliance with study requirements, as determined by the principle investigators Exclusion Criteria - AGA population * Known contraindication to completion of 30 minutes of moderate intensity exercise * BMI \>40 * Severe maternal anemia (Hb less than 8.0) * Placenta previa * 2nd or 3rd trimester vaginal bleeding * Preterm premature rupture of membranes * Cervical insufficiency * Multi-fetal gestation * Oligohydramnios * Hypertensive disorder requiring antihypertensive medication * Blood pressure \>140/90 on the day of the study visit prior to exercise * Tobacco use * Opioid agonist therapy * Known fetal chromosomal anomaly, structural anomaly or infection * Inability or unwillingness of subject to give informed consent * Current psychiatric illness/social situation that would limit compliance with study requirements, as determined by the principle investigators