Development of new aerodynamic testing methods for evaluating the dependency ration of loud vocalization on laryngeal resistance and expiratory effort

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K16857
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 56050:Otorhinolaryngology-related
• Research Institution: Osaka University
• Principal Investigator: UMATANI MASANORI 大阪大学, 大学院医学系研究科, 特任研究員 (00804353)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 呼気努力 / 喉頭抵抗 / 胸腔内圧 / 腹腔内圧 / 皮膚加速度レベル

Outline of Final Research Achievements

To use manometry, expiratory effort can be evaluated. Also use accelerometer and manometry, and a vocal function testing device allowed us to evaluate continuous changes in voice intensity and airflow during crescendo vocalization.
In addition, in successful cases of crescendo vocalization, significant differences were observed in both the thoracic esophageal pressure and the gastric pressure at the peak of inspiration immediately before vocalization, at the time of vocalization, and at the peak of the sound pressure level during vocalization. However, in the failed cases, the sound pressure level when starting the voice was high.
It was also revealed that there are intra-individual and inter-individual differences in expiratory effort.

Free Research Field

音声

Academic Significance and Societal Importance of the Research Achievements

消化管マノメトリーを用いることで、呼気努力の評価が可能であり、呼気努力の評価方法の一つとして、消化管マノメトリーの有用性を証明しえた。
クレシェンド発声では、発声直前吸気時、起声時、発声中で、胸部食道内圧および胃内圧の両方に圧差を認めており、胸腹部を用いた発声を行っていることが証明された。
また、母音クレシェンドでは、呼気努力の様式の個人内差違、および個人間差違が存在したことも明らかとなった。