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Voice is produced by using the laryngeal air pressure which has been modulated by the configuration of the vocal tract. Voice plays a major role in speech and hence in communication. A blend of several physiologic activities such as respiration, phonation and resonance subsequently gives rise to human voice. So any anatomical, physiological or functional deviation in any of these systems would lead to a voice disorder or dysphonia. Voice disorder or Dysphonia may be defined as the abnormal production of voice, which is characterized by abnormalities in vocal quality, pitch, loudness, resonance, and/or duration for an individual's age and/or sex, geographical region, and endemic background. There are various types of dysphonia such as organic, functional and psychogenic etc. Each and every type has also many sub-types. This paper deals with muscle tension dysphonia which falls under the category of functional dysphonia. Muscle tension dysphonia (MTD) is a hyper-functional voice disorder in which excessive activity of the intrinsic and extrinsic laryngeal muscles affects voice production. In MTD there is no structural abnormality in the organs associated with speech production, rather the muscles do not function properly, which causes poor sound, discomfort, or a sensation of increased effort. The aim of the present study is to compare the acoustic voice quality index (AVQI) in subjects with muscle tension dysphonia and normophonia i.e. person with normal voice and having no complain of voice discomfort. A total of 60 participants of age range 20-50 years have been selected for the present study. Male and female participants are in equal ratio. Both male and female participants are further sub-divided into two groups: one is normal population and the other with muscle tension dysphonia. The value of AVQI shows significant difference between normophonics and patient with muscle tension dysphonia.
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