Abstract
Measures of autonomic nervous system functioning have received considerable attention because of the recognition that differences in sympathetic-parasympathetic balance may account for differences in neurobehavioral development. The purpose of this study was to determine if human fetuses could be categorized as either sympathetic-dominated or parasympathetic-dominated based on an analysis of the resting heart rate variability power distribution. The study population consisted of 17 normal human fetuses in quiet sleep between 36 and 40 weeks gestation. The fetal electrocardiogram was captured transabdominally in 3-min blocks at a rate of 833 Hz and fetal R-waves were extracted from the raw data using adaptive signal processing techniques. The fetal R-wave interbeat intervals (IBls) were converted to equally spaced, time-based data, and linear detrending was accomplished by subtracting the mean heart period from each weighted IBI. Total power (TP, 0.0-2.5 Hz) was divided into respiratory sinus arrhythmia (R...
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