Federal Agency for Occupational Risks, Brussels, Belgium.
Institute of Neurosciences, University of Louvain, Brussels, Belgium.
J Voice. 2022 Sep;36(5):608-621. doi: 10.1016/j.jvoice.2020.08.025. Epub 2020 Sep 28.
Mechanical impact stress on the vocal fold surface, particularly when excessive, has been postulated to cause the so-called phonotraumatic tissue lesions, such as nodules and polyps. The collision stress between the vocal folds depends on the vocal fold velocity at the time of impact. Hence this vocal fold collision speed is a relevant parameter when considering biomechanical economy of phonation, especially in voice professionals needing a louder voice than normal. Combining a precise photometric measurement of glottal area and simultaneous measurements of translaryngeal impedance (electroglottogram) for identifying the time of the maximum rate of increase of vocal fold contact allows computing the vocal fold collision speed in a wide range of loudnesses. The vocal fold collision speed is - for modal voicing - always smaller than the maximum vocal fold velocity during the closing phase, but it strongly increases with intensity. Moreover, this increase shows a biphasic pattern, with a significant enhancement from a certain value of dB on. Understanding physiological variables that influence vocal fold collision forces provides relevant insight into the pathophysiology and the prevention of voice disorders associated with phonotraumatic vocal hyperfunction.
声带表面的机械冲击应力，特别是过度的冲击应力，被认为是导致所谓的“声创伤性组织损伤”的原因，如结节和息肉。声带的碰撞应力取决于碰撞发生时的声带速度。因此，当考虑发声的生物力学经济性时，特别是对于需要比正常声音更大音量的职业嗓音使用者，声带碰撞速度是一个相关的参数。结合声门区的精确光度测量和经咽阻抗（声门图）的同时测量，以确定声带接触最大增长率的时间，可以计算出在广泛的响度范围内的声带碰撞速度。对于模态发声，声带碰撞速度总是小于闭合阶段中的最大声带速度，但随着强度的增加而强烈增加。此外，这种增加呈现出双相模式，在某个 dB 值以上有显著增强。了解影响声带碰撞力的生理变量为声创伤性声带功能亢进相关的嗓音障碍的病理生理学和预防提供了相关的见解。
