||Fetal responsiveness to maternal passive swinging in low heart rate variability state: Effects of stimulation direction and duration.
Pregnant women (aged 17-42 yrs), carrying end of gestation fetuses (38-41 wks gestational age) were either gently rocked in an anterior posterior plane in a rocking chair or gently swayed laterally in a garden glider (R5 & R26, SW5 & SW26). Stimulation lasted for either 5 or 26 sec. Fetal heart rate (HR) (bpm) and ultrasonically detected fetal movements were recorded 26 sec before and during stimulation. HR data were processed 2 ways: (1) ANOVAs performed on average values for each group and (2) comparisons of the proportion of subjects in each group showing HR accelerative change (AC), HR decelerative change (DC), or no change (NC) using X^2 statistics. Results of ANOVAs indicated that a 26-sec rocking stimulation induced a significant average HR acceleration (4.53 bpm) compared to a nonstimulated (control) group. Five seconds of rocking had a weaker, but still significant, effect on HR acceleration, but the 2 swaying conditions did not reliably affect either the HR or behavioral measures. Processing data nonparametrically confirmed that R26 stimulation evoked mostly AC (72%) and identified a gradual decrement of AC and DC percentage responses from Group R5, SW26 to Group SW5 while NC percentages raised. (PsycINFO Database Record (c) 2007 APA, all rights reserved)