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Kandavel Thennarasu 1 Article
Phonatory Characteristics of Male Patients with Classic Essential Tremor
Preetie Shetty Akkunje, Belur Keshavaprasad Yamini, Ravi Yadav, Nagarajarao Shivashankar, Palash Kumar Malo, Kandavel Thennarasu, Shantala Hegde, Pramod Kumar Pal
J Mov Disord. 2020;14(3):226-230.   Published online August 18, 2021
DOI: https://doi.org/10.14802/jmd.21010
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AbstractAbstract PDFSupplementary Material
Objective
Voice tremor (VT) is one of the characteristics of essential tremor (ET). This study was designed to describe the group and phonatory characteristics of classic ET patients with VT.
Methods
This retrospective case-control study compared classic ET patients with age and sex-matched controls. The ET population was subgrouped based on auditory perceptual voice analysis. Electroglottography and acoustic voice samples obtained from both groups were analyzed for contact quotient (CQ) and multidimensional voice program parameters, i.e., fundamental frequency (F0), perturbation, noise, and tremor parameters.
Results
The CQ, F0, perturbation, noise, and tremor characteristics significantly increased from the moderate VT group to the severe VT group.
Conclusion
The CQ, F0, and noise characteristics reflected the vocal folds’ functionality. The perturbation and tremor parameters variation were reasoned considering the tremor-related changes occurring in the laryngeal, vocal tract, and expiratory muscles in patients with ET. Thus, phonatory analysis may help in monitoring the progression of ET.

JMD : Journal of Movement Disorders