Objective
This case study seeks to assess whether pregnant singers experience acoustic changes of both their singing and speaking voice across the second and third trimesters of pregnancy.

Methods/Design
This case study observed two young professional singers during their second and third trimesters of pregnancy. Calibrated acoustic data were collected across 10 sessions and were analyzed to assess whether the subjects experienced changes in acoustic properties as their pregnancies progressed. Subjects were asked to complete a sustained vowel, a continuous speech passage, a maximum phonation time task, and to sing the last verse of a popular German lied. Tools from Phonanium’s Clinical Voice Lab (Y. Maryn) will be used to create a detailed acoustic profile and assess variability of each singer’s voice across their 10 recorded sessions. Acoustic measures included in this profile are: Vocal Fundamental Frequency, Vocal Intensity Level, Acoustic Voice Quality Index, and Spectrographic and Cepstrographic Analysis.

Respiratory data from this study were presented in 2025 with findings that suggest a positive correlation between Acoustic Voice Quality Score and Expiratory Total Lung Volume. Acoustic analysis of this data seeks to identify whether pregnancy affects not only respiration coordination but also acoustic characteristics of the singing voice and speaking voice.

Results
Analysis is ongoing and is expected to be completed January 2026. Preliminary analysis of acoustic voice markers suggests increases in jitter (rap) and shimmer (apq3) across the second and third trimester for both participants. The final analysis will determine the statistical significance of these trends as well as others pertaining to acoustic characteristics of the singing and speaking voice.