Electrolaryngographically derived voice source changes of child and adolescent singers.

Children are the most likely demographic group to undertake regular singing or singing training, but to date there has been little quantitative research into the voice production of children. The authors used closed quotient (CQ) measurements to analyse the singing voices of over 200 male and female, trained and untrained singers aged 8-18 years for differences in voice source according to sex, vocal training and age. Results indicated that the voice source production of subjects could be clearly divided into groups according to age, sex and the level of vocal training received. It was concluded that the process of training a young voice has a quantifiable effect upon the voice source. It was also concluded that sex differences result in significant differences in the voice source of child and adolescent singers.