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THE RELATIONSHD? OF FETAL HEART RATE
EXPERIMENTS ON MODIFICATION OF FETAL HEART
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active and inactive amyl nitrite average Barcroft beats per minute Birth length birth weight blood Boas and Goldschmidt bodily activity cardiac cardioacceleration cent changes in fetal changes in heart chronograph Coefficients of variation compared comparison correlation demonstrate Distribution of changes effect electrocardiograms error experimental factors fetal activity fetal heart rate fetal period fetus fetuses five-minute period following vibratory stimulation heart beat heart rate following hysterotomy inactive minutes inactive periods increase indicate individual interdaily last two months maternal cigarette maternal heart rate maxima and minima maximum mean change mean heart rate Mean N Mean means for five measurement minute range minutes following months of pregnancy mother newborn infants Number of observations Number of subjects obtained oxygen possible postnatal pregnancy presented reaction records reported seen Sigma single minutes Sontag and Wallace standard deviation stethoscopic Table ten-beat intervals tendency uterus variability variation in heart various months vibrator vibratory response