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September 20-22, 2017 | Toronto, Canada
10
TH
AMERICAN PEDIATRICS HEALTHCARE &
PEDIATRIC INFECTIOUS DISEASES CONGRESS
Pediatric Healthcare & Pediatric Infections 2017
T
he child voice in trained (voice conscious) boys and
girls was investigated with phonetograms (voice range
profiles) and fundamental frequency (F0) in running speech
while reading a standard text. The methods were based
on: (1) developmement and evaluation of the function
of phonetograph 8301 made by the firm Voice profile,
and (2) combined electroglottographic and stroboscopic
examination of the movements of the vocal folds in speech.
The voice analysis was compared with measurements of: (1)
pubertal stages in youngsters and (2) hormonal analysis of
all androgens and in girls, also estrogens. The phonetograms
(voice range profiles) measured total pitch and loudness
range and an area calculation was made of measured
semitones×dB (A). The electroglottographic single cycles
were stable and 2,000 consecutive electroglottographic
cycles were measured in 48 boys and 47 girls, aged 8-19
years, to measure fundamental frequency in a reading
situation. Individual and average phonetograms (voice
range profiles) for sopranos, altos, tenors and bassos were
examined. Statistical analysis was made with BMDP on the
partly stratified cohort, partly prospective studies. The yearly
change of voice range profiles showed a correlation to total
serum testosterone of r=0.72 in boys, and serum estrone of
r=0.47 in the girls. Single observations of the fundamental
frequencies showed that total serum testosterone over 10
nmol l-1 serum represented values for a boy with a pubertal
voice. The voice parameters were analyzed in 47 girls. F0
was related to estrone r=-0.34 (p<0.05) only. The increase of
estrone and of fundamental frequency range (F0 range) had
a predictive value (p<0.05) for the fall of F=from 256 to 241
Hz in puberty.
Speaker Biography
Mette Pedersen defended her PhD in Oulu University (Finland) based on her research
at Gentofte Hospital, Denmark in 1997. Currently, she is working as an ENT Specialist
at The Medical Centre, Voice Unit, Østergade 18, Copenhagen. She has by invitation,
been Member of the European Union of Phoniatricians since 1976 and from 2011 been
Honorary Member of Pacific Voice and Speech Foundation.
e:
m.f.pedersen@dadlnet.dkNormal development of voice in children: Advances in the evidence-based standard
Mette Pedersen
Cambridge IBC, UK