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|title: ||Pregnancy and the Singing Voice: Reports From a Case Study|
|authors: ||Lã, FMB|
|keywords: ||Vocal fold motility|
Phonation threshold pressure
Collision threshold pressure
Normalized amplitude quotient
Dominance of the voice source fundamental
|issue date: ||Apr-2011|
|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.|
|publisher version/DOI: ||http://dx.doi.org/10.1016/j.jvoice.2010.10.010|
|source: ||Journal of Voice|
|appears in collections||INETmd - Artigos|
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