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Baby Lab

Intranet
Decelerative cardiac responsiveness to acoustical stimulation in the near term fetus.

Human fetal cardiac responses (N = 107; 36-39 wks gestational age) to brief, repeated vocal stimuli (male or female voice uttering the same sentence), given at 90-95 dB SPL ex utero during a state of low fetal heart rate (FHR) variability, were examined using highly conservative statistical criteria taking into account each S's prestimulus FHR variability. Ss exposed to either of the 2 stimuli displayed significantly more decelerative heart rate (HR) changes compared to control Ss receiving no stimulation. Decelerative changes started during the 1st seconds following onset of stimulation and reached their amplitude peak within 10 or 20 sec, depending on the S. The direction (HR acceleration or deceleration) and amplitude of response depended on prestimulus HR variability only. (French & Spanish abstracts) (PsycINFO Database Record (c) 2007 APA, all rights reserved)