Phonetograms (planimetry) had clearly bigger dynamics in the older pupils after the pubertal register shift, with a falling of the lowest tones in both sexes.
The fundamental frequency in reading a standing text changed in boys with an octave and in girls with one-fourth octave, related significantly to an increase of the tonal range of five semitones for both girls and boys.
The statistically significant results are that the change of fundamental frequency in puberty is related to testosterone in boys and estrogens in girls.
Prospectively testosterone values over 10 nmol/ml suggest a boy in vocal puberty. A girl after menarche and with a tonal range in reading of five semitones is post-pubertal.
KeywordsFundamental Frequency Serum Testosterone Level Pubic Hair Development Speak Voice Oestrone Sulphate
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