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 Pregnancy and the Singing Voice: Reports From a Case Study
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/7006

title: Pregnancy and the Singing Voice: Reports From a Case Study
authors: Lã, FMB
Sundberg, J.
keywords: Vocal fold motility
Glottal adduction
Phonation threshold pressure
Collision threshold pressure
Normalized amplitude quotient
Alpha ratio
Dominance of the voice source fundamental
issue date: Apr-2011
publisher: Elsevier
abstract: Summary: Objectives. Significant changes in body tissues occur during pregnancy; however, literature concerning the effects of pregnancy on the voice is sparse, especially concerning the professional classically trained voice. Hypotheses. Hormonal variations and associated bodily changes during pregnancy affect phonatory conditions, such as vocal fold motility and glottal adduction. Design. Longitudinal case study with a semiprofessional classically trained singer. Methods. Audio, electrolaryngograph, oral pressure, and air flow signals were recorded once a week during the last 12 weeks of pregnancy, 48 hours after birth and during the following consecutive 11 weeks. Vocal tasks included diminuendo sequences of the syllable /pae/ sung at various pitches, and performing a Lied. Phonation threshold pressures (PTPs) and collision threshold pressures (CTPs), normalized amplitude quotient (NAQ), alpha ratio, and the dominance of the voice source fundamental were determined. Concentrations of sex female steroid hormones were measured on three occasions. A listening test of timbral brightness and vocal fatigue was carried out. Results. Results demonstrated significantly elevated concentrations of estrogen and progesterone during pregnancy, which were considerably reduced after birth. During pregnancy, CTPs and PTPs were high; and NAQ, alpha ratio, and dominance of the voice source fundamental suggested elevated glottal adduction. In addition, a perceptible decrease of vocal brightness was noted. Conclusions. The elevated CTPs and PTPs during pregnancy suggest reduced vocal fold motility and increased glottal adduction. These changes are compatible with expected effects of elevated concentrations of estrogen and progesterone on tissue viscosity and water retention.
URI: http://hdl.handle.net/10773/7006
ISSN: 1557-8658
publisher version/DOI: http://dx.doi.org/10.1016/j.jvoice.2010.10.010
source: Journal of Voice
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