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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effects of pre-irradiation of low-level laser therapy with different doses and wavelengths in skeletal muscle performance, fatigue, and skeletal muscle damage induced by tetanic contractions in rats

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Autor(es):
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Santos, Larissa Aline [1] ; Marcos, Rodrigo Labat [2] ; Tomazoni, Shaiane Silva [3] ; Vanin, Adriane Aver [1] ; Antonialli, Fernanda Colella [1] ; Grandinetti, Vanessa dos Santos [2] ; Albuquerque-Pontes, Gianna Moes [2] ; Vicente de Paiva, Paulo Roberto [2] ; Brandao Lopes-Martins, Rodrigo Alvaro [3] ; Camillo de Carvalho, Paulo de Tarso [1, 2] ; Bjordal, Jan Magnus [4, 5] ; Pinto Leal-Junior, Ernesto Cesar [1, 2]
Número total de Autores: 12
Afiliação do(s) autor(es):
[1] Univ Nove Julho UNINOVE, Postgrad Program Rehabil Sci, BR-01504001 Sao Paulo - Brazil
[2] Univ Nove Julho UNINOVE, Postgrad Program Biophoton Appl Hlth Sci, BR-01504001 Sao Paulo - Brazil
[3] Univ Sao Paulo, Dept Pharmacol, BR-05508900 Sao Paulo - Brazil
[4] Univ Bergen, Fac Med & Dent, Dept Global Publ Hlth, Physiotherapy Res Grp, N-5020 Bergen - Norway
[5] Bergen Univ Coll, Ctr Knowledge Based Practice, N-5009 Bergen - Norway
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Lasers in Medical Science; v. 29, n. 5, p. 1617-1626, SEP 2014.
Citações Web of Science: 35
Resumo

This study aimed to evaluate the effects of low-level laser therapy (LLLT) immediately before tetanic contractions in skeletal muscle fatigue development and possible tissue damage. Male Wistar rats were divided into two control groups and nine active LLLT groups receiving one of three different laser doses (1, 3, and 10 J) with three different wavelengths (660, 830, and 905 nm) before six tetanic contractions induced by electrical stimulation. Skeletal muscle fatigue development was defined by the percentage (%) of the initial force of each contraction and time until 50 % decay of initial force, while total work was calculated for all six contractions combined. Blood and muscle samples were taken immediately after the sixth contraction. Several LLLT doses showed some positive effects on peak force and time to decay for one or more contractions, but in terms of total work, only 3 J/660 nm and 1 J/905 nm wavelengths prevented significantly (p < 0.05) the development of skeletal muscle fatigue. All doses with wavelengths of 905 nm but only the dose of 1 J with 660 nm wavelength decreased creatine kinase (CK) activity (p < 0.05). Qualitative assessment of morphology revealed lesser tissue damage in most LLLT-treated groups, with doses of 1-3 J/660 nm and 1, 3, and 10 J/905 nm providing the best results. Optimal doses of LLLT significantly delayed the development skeletal muscle performance and protected skeletal muscle tissue against damage. Our findings also demonstrate that optimal doses are partly wavelength specific and, consequently, must be differentiated to obtain optimal effects on development of skeletal muscle fatigue and tissue preservation. Our findings also lead us to think that the combined use of wavelengths at the same time can represent a therapeutic advantage in clinical settings. (AU)

Processo FAPESP: 12/04295-2 - Análise dos padrões dose-resposta de diferentes comprimentos de onda da laserterapia de baixa potência na fadiga muscular em ratos
Beneficiário:Larissa Aline Santos
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 10/52404-0 - Laserterapia de baixa potência na fadiga muscular e recuperação muscular pós-exercício: parâmetros ideais de aplicação e efeitos em exercício de longa duração
Beneficiário:Ernesto Cesar Pinto Leal Junior
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 12/06832-5 - Laserterapia de baixa potência e diclofenaco sódico de uso tópico na lesão muscular induzida por contusão em ratos
Beneficiário:Lúcio Frigo
Linha de fomento: Auxílio à Pesquisa - Regular