Viscoelastic shear properties of human vocal fold mucosa: measurement methodology and empirical results

A standard method for the empirical rheological characterization of viscoelastic materials was adopted to measure the viscoelastic shear properties of human vocal-fold mucosal tissues (the superficial layer of lamina propria). A parallel-plate rotational rheometer was employed to measure shear defor...

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Published in:The Journal of the Acoustical Society of America 1999-10, Vol.106 (4 Pt 1), p.2008-2021
Main Authors: Chan, R W, Titze, I R
Format: Article
Language:English
Subjects:
Adult
Age Factors
Aged
Aged, 80 and over
Aging - physiology
Elasticity
Female
Humans
Laryngeal Mucosa - physiology
Male
Middle Aged
Models, Biological
Rheology
Sex Factors
Viscosity
Vocal Cords - physiology
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cites cdi_FETCH-LOGICAL-c376t-d2f3a370f63e96d86c15fd2ad4454d4ddf938b7bd715cc8f1293cf070e125883
container_end_page 2021
container_issue 4 Pt 1
container_start_page 2008
container_title The Journal of the Acoustical Society of America
container_volume 106
creator Chan, R W
Titze, I R
description A standard method for the empirical rheological characterization of viscoelastic materials was adopted to measure the viscoelastic shear properties of human vocal-fold mucosal tissues (the superficial layer of lamina propria). A parallel-plate rotational rheometer was employed to measure shear deformation of viscoelastic tissue samples, which were deformed between two rigid circular plates rotating in small-amplitude sinusoidal oscillations. Elastic and viscous shear moduli of the samples were then quantified as a function of oscillation frequency (0.01 to 15 Hz) based on shear stresses and strains recorded by the rheometer. Data were obtained from 15 excised human larynges (10 male and 5 female). Results showed that the elastic shear modulus mu and the damping ratio zeta of human vocal-fold mucosa were relatively constant across the range of frequencies observed, while the dynamic viscosity eta decreased monotonically with frequency (i.e., shear thinning). Intersubject differences in mu and eta as large as an order of magnitude were observed, part of which may reflect age-related and gender-related differences. Some molecular interpretations of the findings are discussed.
doi_str_mv 10.1121/1.427947
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subjects Adult
Age Factors
Aged
Aged, 80 and over
Aging - physiology
Elasticity
Female
Humans
Laryngeal Mucosa - physiology
Male
Middle Aged
Models, Biological
Rheology
Sex Factors
Viscosity
Vocal Cords - physiology
title Viscoelastic shear properties of human vocal fold mucosa: measurement methodology and empirical results
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