Journal of voice : official journal of the Voice Foundation · 2025
Immediate Effect of Photobiomodulation Associated with the Voiced Tongue Trill Technique on Amateur Singers' Voices: A Triple-Blind Randomized Clinical Trial.
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Souza Mayara Kerolyn de, Ximenes Coeli Regina Carneiro, Pimenta Alcineide da Silva, Gomes Adriana de Oliveira Camargo
Аннотация
PURPOSE: This exploratory study aims to evaluate the immediate effects of photobiomodulation (PBM) combined with the voiced tongue trill technique (VTTT) on the voice of amateur singers.
METHOD: This triple-blind randomized experimental clinical trial used the consolidated standards of reporting trials for randomized clinical studies. The study sample comprised 32 amateur singers, aged 18-45 years (mean age of 32 ± 8.06 years). Participants were randomly distributed into groups. The placebo group (G1) was submitted to light emission without the PBM effect, associated with the VTTT, whereas subjects in the experimental group (G2) were submitted to PBM associated with VTTT. All participants underwent vocal assessment, including acoustic voice analysis and self-perceived vocal effort, before and after the intervention.
RESULT: After applying PBM associated with VTTT, the glottal-to-noise excitation ratio increased in the experimental group's weak emission (P = 0.003), and the shimmer (P = 0.004) and jitter (P = 0.043) values decreased in the group without PBM effect. After applying the technique, the mean fundamental frequency increased and the perceived vocal effort decreased in both groups.
CONCLUSION: It was not possible to observe in this study an immediate effect on PBM associated with VTTT in the parameter studied. It can also be concluded that there was a decrease in vocal effort in two groups, according to the singers' self-perception, after the VTTT, with or without PBM.
METHOD: This triple-blind randomized experimental clinical trial used the consolidated standards of reporting trials for randomized clinical studies. The study sample comprised 32 amateur singers, aged 18-45 years (mean age of 32 ± 8.06 years). Participants were randomly distributed into groups. The placebo group (G1) was submitted to light emission without the PBM effect, associated with the VTTT, whereas subjects in the experimental group (G2) were submitted to PBM associated with VTTT. All participants underwent vocal assessment, including acoustic voice analysis and self-perceived vocal effort, before and after the intervention.
RESULT: After applying PBM associated with VTTT, the glottal-to-noise excitation ratio increased in the experimental group's weak emission (P = 0.003), and the shimmer (P = 0.004) and jitter (P = 0.043) values decreased in the group without PBM effect. After applying the technique, the mean fundamental frequency increased and the perceived vocal effort decreased in both groups.
CONCLUSION: It was not possible to observe in this study an immediate effect on PBM associated with VTTT in the parameter studied. It can also be concluded that there was a decrease in vocal effort in two groups, according to the singers' self-perception, after the VTTT, with or without PBM.