Vocal Fatigue in School Teachers and It's Relation to the Acoustic analysis of Voice.

Abstract

Voice disorders are thought to be one of the major occupational hazards of school teaching. There is a need to study the prevalence of vocal fatigue in school teachers as it is unknown in Indian population and its awareness is at a very basic level. We aim to investigate percentage of school teachers reporting vocal fatigue and to find if there is any relationship between vocal fatigue and acoustic voice parameters. A total of 100 subjects (50-males and 50-females) in the age range of 25-35years participated in the study. Voice Sample was obtained from the subject using a digital tape recorder and was analyzed in Visi pitch and Dr.Speech softwares. The sample was taken twice in a day, that is, before teaching and after teaching. The mean values obtained on all the questions of the vocal fatigue questionnaire show a significant increase in mean values on all the questions at post teaching ratings. Results revealed a statistically significant difference in pre and post teaching values of F0 and shimmer in males. In females, statistical significant difference was obtained in Noise to Harmonic Ratio in /u/ production. No significant correlation between acoustic parameters and overall vocal fatigue was found except for Noise to Harmonic ratio in females for /u/.