title: The influence of thyroarytenoid and cricothyroid muscle activation on vocal fold stiffness and eigenfrequencies.
abstract: The influence of the thyroarytenoid (TA) and cricothyroid (CT) muscle activation on vocal fold stiffness and eigenfrequencies was investigated in a muscularly controlled continuum model of the vocal folds. Unlike the general understanding that vocal fold fundamental frequency was determined by vocal fold tension, this study showed that vocal fold eigenfrequencies were primarily determined by vocal fold stiffness. This study further showed that, with reference to the resting state of zero strain, vocal fold stiffness in both body and cover layers increased with either vocal fold elongation or shortening. As a result, whether vocal fold eigenfrequencies increased or decreased with CT/TA activation depended on how the CT/TA interaction influenced vocal fold deformation. For conditions of strong CT activation and thus an elongated vocal fold, increasing TA contraction reduced the degree of vocal fold elongation and thus reduced vocal fold eigenfrequencies. For conditions of no CT activation and thus a resting or slightly shortened vocal fold, increasing TA contraction increased the degree of vocal fold shortening and thus increased vocal fold eigenfrequencies. In the transition region of a slightly elongated vocal fold, increasing TA contraction first decreased and then increased vocal fold eigenfrequencies.
authors: Department of Head and Neck Surgery, UCLA School of Medicine, 31-24 Rehabilitation Center, 1000 Veteran Avenue, Los Angeles, California 90095-1794, USA.
authors: Jun
authors: J
authors: Yin
authors: Zhaoyan
authors: Z
authors: Zhang
mesh_terms: D001696:Biomechanical Phenomena; D003198:Computer Simulation; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D007821:Laryngeal Muscles / Q000033:anatomy & histology / Q000502:physiology*; D008953:Models, Anatomic; D009119:Muscle Contraction; D009716:Numerical Analysis, Computer-Assisted; D010699:Phonation; D013314:Stress, Mechanical; D014827:Vocal Cords / Q000033:anatomy & histology / Q000502:physiology*; D014833:Voice Quality
references: J Acoust Soc Am. 2011 Dec;130(6):4010-9
references: 22225055
references: J Acoust Soc Am. 2007 Apr;121(4):2247-53
references: 17471738
references: J Acoust Soc Am. 2006 Sep;120(3):1558-69
references: 17004478
references: J Speech Hear Res. 1989 Jun;32(2):226-31
references: 2739373
references: J Acoust Soc Am. 2008 Dec;124(6):3888-96
references: 19206814
references: Comput Methods Biomech Biomed Engin. 2007 Oct;10(5):377-88
references: 17891575
references: J Voice. 2012 Sep;26(5):535-47
references: 22209063
references: J Acoust Soc Am. 2011 Aug;130(2):965-76
references: 21877809
references: J Acoust Soc Am. 1979 Jul;66(1):60-74
references: 489833
references: J Acoust Soc Am. 2004 May;115(5 Pt 1):2264-9
references: 15139637
references: Pract Otorhinolaryngol (Basel). 1959 Nov;21:425-50
references: 13841006
references: J Acoust Soc Am. 2006 Jul;120(1):386-97
references: 16875234
references: J Voice. 2011 Nov;25(6):e255-63
references: 21550776
references: J Acoust Soc Am. 2006 Feb;119(2):1050-62
references: 16521767
references: J Acoust Soc Am. 1996 Nov;100(5):3345-54
references: 8914316
references: J Acoust Soc Am. 2011 Nov;130(5):2961-8
references: 22087924
references: J Voice. 2011 Jan;25(1):1-7
references: 20171829
references: J Acoust Soc Am. 2007 Aug;122(2):1090-101
references: 17672656
references: J Acoust Soc Am. 1991 Sep;90(3):1326-31
references: 1939897
references: J Biomech. 2005 Apr;38(4):657-65
references: 15713285
references: J Acoust Soc Am. 2004 Apr;115(4):1747-59
references: 15101653
references: Folia Phoniatr (Basel). 1974;26(2):89-94
references: 4845615
references: J Speech Lang Hear Res. 2012 Oct;55(5):1395-406
references: 22271874
references: J Acoust Soc Am. 2007 Oct;122(4):2279-95
references: 17902864
references: J Acoust Soc Am. 2002 Sep;112(3 Pt 1):1064-76
references: 12243155
references: J Acoust Soc Am. 2010 Apr;127(4):2554-62
references: 20370037
references: J Acoust Soc Am. 1975 Mar;57(3):736-49
references: 1123491