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Abstract Introduction: Professional voice users such as teachers might experience vocal fatigue after a prolonged voice use. This vocal fatigue can be documented using multiple measures. One of the most common measures includes acoustic analyses which have been extensively used clinically to differentiate normal and pathological voices. Also, self rating scales serve as an excellent measure for vocal fatigue as it reflects ones’ perceived symptoms and severity of voice problem. Though usage of voice is inevitable, measures can be taken to prevent any later vocal pathology which might occur due to prolonged teaching sessions. Aim & objectives: The present study aimed at investigating the frequency related acoustic measures before and after routine voice use in teachers across a day. Method: A total of 20 female teachers with a minimum of 5 years of teaching experience served as the participants for the study. The age range of the teachers was 30 and 40 years. Sustained phonation of vowel /a/, / i/ and /u/ and conversational speech were recorded before and after the routine classroom teaching on the same day. Frequency related acoustic measures like fundamental frequency, formant frequencies (F1, F2 & F3) were measured using Praat software and jitter was measured using Vaghmi software from the recordings. Vocal Fatigue Index - Kannada (VFI-K) was administered before and after the teaching sessions to document the symptoms of vocal fatigue. The measured parameters were subjected appropriate statistical tests using SPSS software version 21. Results: The average exposure time to prolonged voice use in teachers was documented. Statistical differences among the frequency parameters measured were studied. Correlation between the perceptual rating scale and measured acoustic parameters was examined. The statistical tests revealed significant differences in few of the frequency related measures before and after classroom teaching sessions. Conclusions: The frequency related measures were found to be affected after short period of classroom sessions within a day. Hence, it is important to follow appropriate vocal hygiene measures on a regular basis for prevention of vocal pathology.
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