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https://codas.org.br/article/doi/10.1590/2317-1782/20212020363
CoDAS
Artigo Original

Efeitos imediatos da fotobiomodulação com laser de baixa intensidade e comprimentos de onda vermelho (660 nm) e infravermelho (808 nm) na fadiga eletromiográfica do músculo orbicular da boca: estudo clínico randomizado

Immediate effects of red (660 nm) and infrared (808 nm) photobiomodulation therapy on fatigue of the orbicularis oris muscle: a randomized clinical study

Mariana Rodrigues Batista; Ludmila Andrade Estrela; Vanessa Mouffron Novaes Alves; Andréa Rodrigues Motta; Renata Maria Moreira Moraes Furlan

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Resumo

Objetivo: comparar os efeitos imediatos da fotobiomodulação com laser nos comprimentos de onda 660 nm e 808 nm na fadiga do músculo orbicular da boca. Métodos: trata-se de um estudo experimental randomizado, com 60 mulheres, com idade entre 19 e 43 anos. As participantes foram divididas em quatro grupos. O grupo GV recebeu irradiação com laser de comprimento de onda de 660 nm em quatro pontos do orbicular da boca; o grupo GIV recebeu irradiação com laser de comprimento de onda de 808 nm nos mesmos pontos; o grupo controle não recebeu irradiação e o grupo placebo passou pelos mesmos procedimentos dos grupos GV e GIV, porém o equipamento não foi acionado. A irradiação foi realizada com laser de 100 mW de potência, 4 J de energia por ponto e 133,3 J/ cm2 de fluência. Avaliação eletromiográfica foi realizada antes e após a irradiação, concomitantemente ao exercício de protrusão labial sustentada até a sensação de fadiga. O índice de fadiga eletromiográfica foi calculado a partir da frequência mediana. A amplitude do sinal foi avaliada, examinando o RMS, e os valores normalizados pelo pico. A diferença na amplitude entre lábios superiores e inferiores também foi analisada. Todas as variáveis foram comparadas antes e após a irradiação. Resultados: não foram encontradas diferenças significativas nas medidas antes e após a irradiação. Conclusão: a fotobiomodulação, com os parâmetros investigados neste estudo, não resultou em efeitos imediatos sobre a fadiga do músculo orbicular da boca.

Palavras-chave

Terapia com Luz e Baixa Intensidade; Força Muscular; Lábio; Sistema Estomatognático; Fadiga Muscular

Abstract

Purpose: To compare the immediate effects of laser photobiomodulation at wavelengths of 660 nm and 808 nm on fatigue of the orbicularis oris. Methods: This is a randomized study with 60 women aged between 19 and 43 years. The participants were divided into four groups. Group RG received photobiomodulation with a laser wavelength of 660 nm at four points of the orbicularis oris; group IRG received photobiomodulation with a laser wavelength of 808 nm at the same points; the control group did not receive light treatment; and the placebo group underwent the same procedures as RG and IRG but with the equipment switched off. The irradiation was performed with a laser of 100 mW of power, 4 J of energy per point and 133.3 J / cm2 of fluency. An electromyography evaluation was performed before and after the irradiation, concomitantly with the exercise of lip protrusion maintained until the sensation of fatigue. Fatigue was evaluated by a median frequency using the electromyographic fatigue index. The amplitude of the signal was evaluated, examining the root mean square, and the values were normalized by the peak. The difference in amplitude between the upper and lower lips was also analyzed. All variables were compared before and after irradiation. Results: No significant difference was found between the measures taken before and after irradiation. Conclusion: Photobiomodulation with the parameters investigated in this study had no immediate effect on orbicular oris fatigue.

Keywords

Low-Level Light Therapy; Muscle Strength; Lip; Stomatognathic System; Muscle Fatigue

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Submetido em:
20/11/2020

Aceito em:
28/02/2021

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