A biphasic theory for the viscoelastic behaviors of vocal fold lamina propria in stress relaxation.

Full Abstract

In this study, a biphasic theory is applied to investigate the viscoelastic behaviors of vocal fold lamina propria during stress relaxation. The vocal fold lamina propria tissue is described as a biphasic material composed of a solid phase and an interstitial fluid phase. The biphasic theory reveals the interaction between the solid and the fluid. For the one-dimensional case, the analytical solutions of solid displacement, fluid velocity, and stress are derived. The biphasic theory predicts the stress relaxation of the vocal fold lamina propria. The quasilinear viscoelastic model as well as its higher-order elastic parameters can be derived from this biphasic theory. Furthermore, the fluid is found to support the majority of the stress at the early stage of stress relaxation; however, when the time becomes sufficiently large, the solid eventually bears all the stress. The early fluid stress support is much higher than the eventual solid support and may be important for understanding the effects of dehydration on tissue damage. By considering the solid-fluid structure of the vocal fold lamina propria, the biphasic theory allows for a more physical theory of tissue viscoelasticity than a single phase solid description and may provide a valuable physical mechanism for the observed vocal fold rheologic behaviors.

Author information

Author/s: Zhang, Yu (Y); Czerwonka, Lukasz (L); Tao, Chao (C); Jiang, Jack J (JJ);

Affiliation: Department of Surgery, Division of Otolaryngology Head and Neck Surgery, University of Wisconsin Medical School, Madison, Wisconsin 53792-7375, USA.

Grants: 1-RO1DC006019 (Agency:NIDCD NIH HHS) ; 1-RO1DC05522 (Agency:NIDCD NIH HHS)

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Extramural

Journal: The Journal of the Acoustical Society of America (J Acoust Soc Am), published in United States. (Language: eng)

Reference: 2008-Mar; vol 123 (issue 3) : pp 1627-36

Dates: Created 2008/03/18; Completed 2008/04/14; Revised 2008/11/21;

PMID: 18345850, status: MEDLINE (last retrieved date: 2/18/2009)

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