aser effects in women with vocal disorders
- Conditions
- DysphoniaC08.360.940
- Registration Number
- RBR-7cf5tmv
- Lead Sponsor
- niversidade Federal de Minas Gerais
- Brief Summary
Objective: To evaluate the immediate effect of photobiomodulation with low-level 9-joule (J) infrared Laser (light amplification by stimulated emission of radiation) in women with voice complaints and behavioral dysphonia characterized by vocal and laryngeal changes. Methods: This experimental research (phase 2) had a sample of 30 dysphonic women aged 18 to 55 years, whose body mass index (BMI) was below 30. They were randomized in a simple draw into the following two groups with 15 participants each: Group 1 (G1): placebo LASER followed by voiced tongue trill technique (VTTT); and Group 2 (G2): infrared LASER at 9 J per point (totaling 63 J) followed by VTTT. The Laser was applied to specific anatomical points established on the neck to locate the level of the glottis and the main intrinsic laryngeal muscles. The analyses included auditory-perceptual evaluation of voice, aerodynamic measurement of maximum phonation time (MPT), acoustic analysis based on cepstral measures (cepstral peak prominence [CCP] and cepstral peak prominence-smoothed [CPPS]), multiparametric indices (Acoustic Breathiness Index [ABI] and Acoustic Voice Quality Index [AVQI]), self-perceived phonatory effort assessment with the CR10-BR Borg Scale, and visual-perceptual analysis of laryngeal images with high-speed videolaryngoscopy (HSV). All participants had their voices recorded before and immediately after the experiments. Results: Their age ranged from 19 to 49 years (mean of 36) and BMI, from 20 to 29 (mean of 21.4). The groups had homogeneous characteristics regarding age, skin phototype, BMI, number of tongue vibrations, VoiSS score, and laryngeal diagnosis (p > 0.05).The total score on the Voice Symptom Scale ranged from 16 to 87 (mean = 40 points), with no statistical difference between the groups (p = 0.884). Most of the sample had an anterior chink and medio-posterior triangular chink. The voice quality was not significantly different between the intervention moments or the groups in sustained vowel emission, but positive changes in linked speech in the control group. G2 had a increase in MPT (p-value = 0.016), vowel CPPS (p-value = 0.025), and self-perceived phonatory effort (p-value = 0.012), improving the vibration parameters of the vocal folds (p-value = 0.017). Conclusion: The results demonstrated that applying infrared low-level LASER immediately improved aerodynamic and cepstral measures, self-perceived phonatory effort, and laryngeal visual examination in dysphonic women, suggesting this resource has an enhancing effect on vocal results
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Data analysis completed
- Sex
- Female
- Target Recruitment
- Not specified
Vocally healthy participants - women aged 18 to 45; no vocal complaints or laryngeal injuries; neutral vocal quality. Dysphonic participants - women aged 18 to 45; with complaints or altered vocal quality or diagnosis of benign lesions of the larynx
Pregnant women; women in the premenstrual period; with an allergic reaction, and/or respiratory condition on the day of the assessment; with a systemic, neurological, and/or neoplastic disease; smokers; women who had been previously submitted to speech-language-hearing and/or surgical treatment due to voice changes; who were photosensitive or had a skin disease/lesion; who had a tattoo in the region where light would be applied; and those who reported taking skin treatment medications
Study & Design
- Study Type
- Intervention
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method
- Secondary Outcome Measures
Name Time Method