Department of Otorhinolaryngology, Head and Neck Surgery, Division of Phoniatrics, University Hospital Basel, Basel, Switzerland.
Institute of Radiology, Limmattal Hospital, Schlieren, Switzerland.
J Voice. 2020 Mar;34(2):165-169. doi: 10.1016/j.jvoice.2018.08.020. Epub 2018 Sep 25.
Vocal folds are widely assumed to only elongate to raise vocal pitch. However, the mechanisms seem to be more complex and involve both elongation and tensioning of the vocal folds in series. The aim of the present study was to show that changes in vocal fold morphology depend on vocal fold elongation and tensioning during singing.
This was a prospective study.
Forty-nine professional female singers (25 sopranos, 24 altos) were recruited and three-dimensional laryngeal images analyzed in a coronal view derived from high-resolution computed tomography scans obtained at the mean speaking fundamental frequency (ƒ) and one (2ƒ) and two octaves (4ƒ) above ƒ.
The vocal fold angle, defined by a tangent above and below the vocal folds, was 58° at ƒ, 47° at 2ƒ, and 59° at 4ƒ.
The decreased caudomedial angle of the vocal fold from ƒ to 2ƒ (change in muscle belly from ";fat" to "thin") and increased angle from 2ƒ to 4ƒ (from "thin" to "fat") strongly supports the hypothesis that the vocal folds elongate and then tension when singing from ƒ to 4ƒ. This is the first study to show this relationship in vivo.
人们普遍认为，声带仅通过延长来提高音高。然而，其机制似乎更为复杂，涉及声带的延长和紧张的串联。本研究旨在表明，声带形态的变化取决于歌唱时声带的延长和紧张。
这是一项前瞻性研究。
招募了 49 名专业女性歌手（25 名女高音，24 名女中音），并在高分辨率计算机断层扫描的冠状视图中分析了声带的三维图像，该视图是在说话基本频率（ƒ）以及 ƒ 的一个八度（2ƒ）和两个八度（4ƒ）处获得的。
声带角由声带上下的切线定义，在ƒ时为 58°，在 2ƒ时为 47°，在 4ƒ时为 59°。
从 ƒ 到 2ƒ 时声带尾内侧角的减小（从“脂肪”到“瘦”的肌腹变化）和从 2ƒ 到 4ƒ 时角度的增加（从“瘦”到“脂肪”）强烈支持声带在从 ƒ 到 4ƒ 歌唱时延长然后紧张的假说。这是首次在体内显示这种关系的研究。
