Programa de Pós-graduação em Ciências Fonoaudiológicas, Departamento de Fonoaudiologia, Faculdade de Medicina, Universidade Federal de Minas Gerais - UFMG - Belo Horizonte (MG), Brasil.
Departamento de Fonoaudiologia, Faculdade de Medicina, Universidade Federal de Minas Gerais - UFMG - Belo Horizonte (MG), Brasil.
Codas. 2024 Aug 2;36(5):e20230333. doi: 10.1590/2317-1782/20242023333en. eCollection 2024.
Establish points on the neck, correspondent to the laryngeal topography, where to apply Low Level Light therapy (LLLT), to evaluate the incidence of light through variables such as skin phototype and body mass index (BMI).
This is a cross-sectional, analytical, observational study, carried out with 15 vocally healthy women, between 18 and 50 years of age, who were divided into three groups, according to BMI and skin phototype. Six anatomical reference points were established to locate the larynx and its musculature, with visual monitoring by videonasolaryngoscopy, to assess light reach (present/absent) and degree of illumination (from very weak to very strong) in the larynx during the LASER application at doses of 3J, 6J and 9J. A flexible endoscope was used for visual monitoring during the LASER application, and subsequent image analysis.
The light reached the larynx at doses of 3J, 6J and 9J, in the anterior commissure of the vocal folds, membranous (thyroarytenoid muscle) and cartilaginous portions of the vocal fold and the cricothyroid muscle. The degree of LASER light illumination decreased in overweight and obese participants and increased in moderate brown and dark brown skin phototypes.
Data suggest that the LLLT penetrates differently according to skin phototype and BMI, being more evident in individuals with Fitzpatrick IV and V phototypes and less evident with higher BMI levels. The evidence that the LASER light reaches the larynx in specific anatomical points provides direction for the standardization of its use in voice practice.
确定颈部与喉部解剖结构相对应的位点，以便在这些位点应用低水平激光疗法（LLLT），并评估皮肤光型和体重指数（BMI）等变量对光穿透的影响。
这是一项横断面、分析性、观察性研究，共纳入 15 名 18 至 50 岁的嗓音健康女性，根据 BMI 和皮肤光型将其分为三组。确定了六个解剖参考点来定位喉部及其肌肉，通过视频喉镜进行视觉监测，以评估在应用 LASER 剂量为 3J、6J 和 9J 时，光在喉部的到达情况（存在/不存在）和照明程度（从非常弱到非常强）。在应用 LASER 期间使用柔性内窥镜进行视觉监测，并进行后续的图像分析。
在应用 LASER 剂量为 3J、6J 和 9J 时，光在前声带联合部、声带膜部（甲状杓肌）和软骨部以及环甲肌处到达了喉部。超重和肥胖参与者的 LASER 光照明程度降低，而中度棕色和深棕色皮肤光型的光照明程度增加。
数据表明，LLLT 的穿透深度因皮肤光型和 BMI 而异，在 Fitzpatrick 光型 IV 和 V 的个体中更为明显，而在 BMI 较高的个体中则不那么明显。证据表明，LASER 光可以到达特定的解剖部位，为其在嗓音实践中的标准化应用提供了方向。
