Abstract
Introduction: Training is an integral part of learning any skill. The vocal training helps singers to attain proficiency as they are the most demanding vocal group of all professional voice users. Hence, it is necessary to evaluate the influence of training on the singer’s voice. The current study objective was to investigate the influence of vocal training on voice measures (Acoustic and Aerodynamic) between male Carnatic singers with lower (6 months – 5 years) and higher (6 – 10 years) training using novel task ‘mkaram’ along with lyrical task. Methods: Group 1 consisted of 30 trained male Carnatic singers with lower vocal training, and group 2, 30 trained male singers with higher training in the age of 18-45 years. The acoustic (frequency-related parameter, cepstral, spectral, perturbation and noise) and aerodynamic measures (Maximum Phonation Time and s/z ratio) of voice were obtained. The test-retest reliability was conducted on a sample of 10% of the population from each group, with a two-week interval between the tests. Cross-sectional study design was applied. Results: The statistical analysis revealed significantly decreased frequency-related parameter (ST) such as mean fundamental frequency, lowest fundamental frequency, highest fundamental frequency at low register, highest fundamental frequency at middle register in group 2 during ‘mkaram’ task (p ≤ 0.05). Similarly, one of the spectral-related measure 1st Harmonic - 2nd Harmonic (dB) during lyrical task and one of the noise-related measure Hormonic-to-Noise Ratio (dB) at middle register during ‘mkaram’ task showed significant decrease in the group 2 compared to group 1 (p ≤ 0.05). Test-retest reliability revealed that most of the parameters had ‘acceptable to excellent’ internal consistency (Cronbach’s α > 0.7 to 1). Conclusion: Few frequency and noise measures during ‘mkaram’ task and a spectral measure during lyrical task showed to be sensitive in distinguishing the impact of vocal training on the voices of male Carnatic singers. The higher vocal training was found to help the singers to perform more efficiently with enhanced vocal range particularly in the low register and to some extent in the middle register. Indeed, the study highlighted the positive effects of vocal training on male Carnatic singers.
