2001 Fiscal Year Final Research Report Summary
THE RELATIONSHIP BETWEEN THE INTENSITY AND THE MASS OF THE VIBRATING PART IN PATHOLOGIC LARYNGES
| Project/Area Number |
12671661
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | SHIGA UNIVERSITY OF MEDICAL SCIENCE |
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Principal Investigator |
YAZAWA Yoshiro Shiga University of Medical Science, Otolaryngology, Associate Professor, 医学部, 助教授 (60127040)
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| Co-Investigator(Kenkyū-buntansha) |
KATAOKA Hideyuki Shiga University of Medical Science, Otolaryngology, Research Associates, 医学部, 助手 (00224436)
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| Project Period (FY) |
2000 – 2001
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| Keywords | fundamental frequency / transglottal pressure / phonation / rubber model of vibration / vocal cord / vibration |
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| Research Abstract |
We previously described the relationship between transglottal pressure and the fundamental frequency of phonation (Fo) in normal subjects. The change in Fo per unit change in transglottal pressure (dF/dP) shows a nonlinear or V-shaped relation to Fo, When Fo is increased from low to high within a modal register, the values for dF/dP fall until FO reaches values of 200 to 250 Hz. The values for dF/dP increase when these frequencies are exceeded.
We hypothesize that the at a lower Fo, the elongation of the vibrating part, and at a higher Fo, the restriction of the vibrating part would be responsible for the V-shaped relation between dF/dP and Fo. The dog experiments performed in this study supported this hypothesis. The rubber model experiments performed in this study also supported this hypothesis. The vocal fold dehydration lowered the values for dF/dP in a lower Fo, resulting in relatively flat V-shape. This suggests that the strategy for raising Fo would be altered by the dehydration.
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