Vibroacoustic stimulation and intrauterine sound pressure levels

M. Nyman, S. Arulkumaran, T. S. Hsu, S. S. Ratnam, O. Till, M. Westgren

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The sound pressure level in amniotic fluid generated by vibroacoustic stimulation, assessed with a hydrophone placed close to the fetal head, was studied in 16 subjects. The mean recorded sound pressure level was 115 dB and the highest level was 129 dB. The range of the background noise was 63.5-80.5 dB. There was no obvious relationship between the distance from the stimulator to the hydrophone and the intrauterine sound pressure level. Although sound pressure levels are high, they are probably reduced before reaching the cochlea of the fetus because of the surrounding amniotic fluid and the fluid in the middle ear.

Original languageEnglish
Pages (from-to)803-806
Number of pages4
JournalObstetrics and Gynecology
Issue number5
Publication statusPublished - 1991


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