What is the best moment to apply phototherapy when associated to a strength training program? A randomized, double-blinded, placebo-controlled trial

Autor(es)

Vanin, Adriane Aver ; Miranda, Eduardo Foschini ; Monteiro Machado, Caroline Santos ; Vicente de Paiva, Paulo Roberto ; Albuquerque-Pontes, Gianna Moes ; Casalechi, Heliodora Leao ; Camillo de Carvalho, Paulo de Tarso ; Pinto Leal-Junior, Ernesto Cesar

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 31, n. 8, p. 1555-1564, NOV 2016.
• Citações Web of Science: 23

Resumo

The effects of phototherapy (or photobiomodulation therapy) with low-level laser therapy (LLLT) and/or light-emitting diodes (LEDs) on human performance improvement have been widely studied. Few studies have examined its effect on muscular training and no studies have explored the necessary moment of phototherapy irradiations (i.e., before and/or after training sessions). The aim of this study was to determine the optimal moment to apply phototherapy irradiation when used in association with strength training. Forty-eight male volunteers (age between 18 to 35 years old) completed all procedures in this study. Volunteers performed the strength training protocol where either a phototherapy and/or placebo before and/or after each training session was performed using cluster probes with four laser diodes of 905 nm, four LEDs of 875 nm, and four LEDs of 640 nm-manufactured by Multi Radiance Medical (TM). The training protocol duration was 12 weeks with assessments of peak torque reached in maximum voluntary contraction test (MVC), load in 1-repetition maximum test (1-RM) and thigh circumference (perimetry) at larger cross-sectional area (CSA) at baseline, 4 weeks, 8 weeks, and 12 weeks. Volunteers from group treated with phototherapy before and placebo after training sessions showed significant (p < 0.05) changes in MVC and 1-RM tests for both exercises (leg extension and leg press) when compared to other groups. With an apparent lack of side effects and safety due to no thermal damage to the tissue, we conclude that the application of phototherapy yields enhanced strength gains when it is applied before exercise. The application may have additional beneficial value in post-injury rehabilitation where strength improvements are needed. (AU)

• Processo FAPESP: 13/25814-0 - Adaptações agudas da fototerapia aplicada em associação ao treinamento muscular: avaliação de diferentes protocolos de irradiação
• Beneficiário: Caroline Monteiro Machado
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 13/19355-3 - Fototerapia aplicada em associação ao treinamento muscular: Avaliação de diferentes protocolos de irradiação
• Beneficiário: Adriane Aver Vanin
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores