Effects of lung volume on the glottal voice source1
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2021, Journal of VoiceCitation Excerpt :The patients with MTD we studied may be demonstrating the same prioritization of laryngeal resistance maintenance: Since laryngeal resistance is defined as subglottal pressure divided by laryngeal airflow, and laryngeal airflow did not differ significantly between the groups, it follows that the MTD group could have spoken at higher subglottal pressure than the control group. Iwarrson et al also showed that speaking at decreasing lung volumes increased closing quotient while decreasing subglottal pressure.40 Since laryngeal muscle tension dictates vocal fold length and adduction, it is conceivable that increased lung volumes during phonation in the MTD group led to increased subglottal pressure necessitating increased muscle tension and the subsequent symptomatology of MTD.
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This paper was presented at the 25th Annual Symposium: Care of the Professional Voice, June 3-9, 1996, Philadelphia, Pennsylvania, U.S.A.