A hangtartás mérőszámainak szerepe a fonációs zavar jellemzésében: az MPT és a sz/z arány elemzése

Damásdi, Nóra (2026) A hangtartás mérőszámainak szerepe a fonációs zavar jellemzésében: az MPT és a sz/z arány elemzése. ALKALMAZOTT NYELVTUDOMÁNY, 26 (1). pp. 22-38. ISSN 1587-1061

Preview

Text Damasdi-Nora.pdf - Published Version Available under License Creative Commons Attribution. Download (360kB) | Preview

Abstract

Phonation is a highly complex physiological process requiring the coordinated interaction of respiratory, laryngeal, and articulatory subsystems. Consequently, the assessment of phonatory disorders (dysphonia) benefits from a multidimensional diagnostic approach that integrates perceptual, acoustic, aerodynamic, and physiological measures. Among aerodynamic methods, maximum phonation time (MPT) and the s/z ratio are widely used in clinical practice due to their simplicity and low cost. However, their diagnostic sensitivity and ability to differentiate between dysphonia subtypes remain debated. The present study examines the relationship and clinical utility of MPT and the s/z ratio in adults with dysphonia, with particular attention to etiological subgroups. 82 adults with dysphonia (25 males, 57 females; mean age: 49,5 years) and 63 control participants were examined. Participants with dysphonia were classified into three etiological groups: structural-organic dysphonia, peripheral neurogenic-organic dysphonia (vocal fold paralysis), and malregulative dysphonia. MPT was measured across three consecutive trials, with the maximum value retained for analysis, while sustained s and z phonation times were used to calculate the s/z ratio. Results showed that participants with dysphonia exhibited significantly shorter MPT values and reduced sustained s, and z durations compared to controls (p < 0,001), whereas the s/z ratio differed only at a trend level. Strong positive correlations were found between maximum MPT and both s and z durations in both groups, with stronger associations observed in the dysphonic group, indicating a closer dependency on glottal closure efficiency. Within-group analyses revealed no significant effects of sex or age. Among dysphonia subtypes, the peripheral neurogenic-organic group demonstrated the lowest performance across most measures, consistent with impaired vocal fold closure, while malregulative dysphonia showed comparatively higher values. Significant differences between participants with neurogenic-organic peripheral dysphonia and malregulative dysphonia were detected in multiple MPT trials and in z duration (p < 0,05), whereas participants with structural-organic dysphonia differed significantly from the peripheral neurogenic-organic group only in maximum MPT and z phonation time. The s/z ratio did not significantly differentiate between dysphonia subtypes. These findings suggest that MPT and sustained z phonation are sensitive and clinically relevant indicators of dysphonia and its etiological characteristics, whereas the s/z ratio provides complementary but limited discriminatory value. Aerodynamic measures should therefore be interpreted within a comprehensive phonatory assessment framework rather than as standalone diagnostic tools.

Actions (login required)

Edit Item