A laserterapia de baixa potência melhora o desempenho muscular mensurado por dinamometria isocinética em humanos

Leal, Ernesto César Pinto; Nassar, Francis Régio; Tomazoni, Shaiane Silva; Bjordal, Jan Magnus; Lopes-Martins, Rodrigo Álvaro Brandão

doi:10.1590/s1809-29502010000400006

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…A aplicação da LBP em alguns estudos não interferiu no desempenho muscular em homens sedentários relacionados ao desenvolvimento da fadiga muscular 21 bem como na produção média de força durante a CIVM avaliada 22 . Todavia, no estudo de Azevedo 22 relatou-se mudança no padrão de recrutamento muscular para o grupo que foi irradiado, visto que foi mantido o mesmo nível de disparo de unidades motoras quando comparado ao momento antes da aplicação, ao contrário do grupo placebo, cujo recrutamento muscular foi menor.…”

Section: Discussionunclassified

Efeito Agudo Do Laser De Baixa Potência Na Fadiga Do Bíceps Braquial De Atletas De Voleibol

Froio

Rennó

Chagas

et al. 2017

Rev Bras Med Esporte

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Introdução: A laserterapia de baixa potência tem entre seus propósitos auxiliar a recuperação de tecidos biológicos, atenuando os efeitos da fadiga muscular e contribuindo com a melhora do desempenho em atletas. Aspectos metodológicos ainda limitam as conclusões do efeito agudo da laserterapia sobre o desempenho muscular. Objetivo: Verificar o efeito agudo do laser terapêutico de baixa potência na fadiga induzida do bíceps braquial de atletas de voleibol. Métodos: Este foi um estudo randomizado e duplo-cego, aprovado pelo Comitê de Ética da UNESP de Marília. Participaram do estudo 19 atletas de voleibol de ambos os sexos. Realizou-se coleta de dados eletromiográficos do músculo bíceps braquial no exercício isométrico de flexão de cotovelo antes e após a aplicação do laser terapêutico. Um haltere com 75% do pico de força, obtido por uma célula de carga, foi utilizado para o protocolo de fadiga. Em seguida, os voluntários foram submetidos à aplicação do laser (ativo ou placebo) em seis pontos do músculo bíceps braquial. Os dados eletromiográficos foram analisados no domínio da frequência, utilizando-se o software Myosystem ® . Verificou-se a distribuição de normalidade dos dados pelo teste de Shapiro-Wilk, e utilizou-se Anova (split plot) de medidas repetidas a fim de testar a interação entre tempo e grupo. Resultados: Para nenhuma das variáveis analisadas foi observada interação significativa entre grupo e tempo, indicando que o grupo irradiado não apresentou vantagens com relação ao grupo placebo. Conclusão: Após o protocolo de fadiga proposto, uma única aplicação de laser de baixa potência não foi suficiente para produzir efeitos positivos no desempenho de força e no sinal eletromiográfico do músculo bíceps braquial de atletas de voleibol.Descritores: fototerapia; eletromiografia; fadiga muscular; voleibol. ABSTRACT Introduction: Low-power laser therapy has among its aims to aid the recovery of biological tissues

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Section: Discussionunclassified

Efeito Agudo Do Laser De Baixa Potência Na Fadiga Do Bíceps Braquial De Atletas De Voleibol

Froio

Rennó

Chagas

et al. 2017

Rev Bras Med Esporte

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“…with radiation different wavelengths (Andrade et al, 2011;Leal et al, 2010c;Lopes-Martins et al, 2007;Maciel et al, 2013;Place et al, 2010;Rocha and Barbanti, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Lopes-Martins et al (2006) also observed a decrease in fatigue after application of LLLT in rat electrically-stimulated muscle. Leal et al (2008;2010b;2010c) reported that LLLT increased the number and duration of contractions in high intensity, short duration exercises designed for volleyball players. Although LLLT apparently increased the muscle fiber diameter at 3 h, this enhancement probably reflected the lower fiber diameter in control muscles rather than an increase caused by LLLT; this conclusion is supported by the fact that the diameter of LLLT-treated muscles at 3 h was similar to the diameters of control and LLLT-treated muscles at 9 h. The reason for the lower fiber diameter in the 3 h control group is unclear.…”

Section: Discussionmentioning

confidence: 99%

Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function

Giaretta

Santos²,

Barbosa

et al. 2015

Res. Biomed. Eng.

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Introduction: Low-level laser therapy (LLLT) is effective in preventing fatigue and in stimulating the microcirculation and cellular activity. In this study, we examined the effect of LLLT on injured tibial muscle in vivo by assessing muscle function during fatigue. Methods: Twenty-four male mice were used. Each mouse received an injection of sterile 0.9% saline solution (50 µL) in the right tibialis anterior muscle, after which the tendon of the muscle was exposed, connected to an isometric transducer and subjected to a resting tension of 1 g. A bipolar electrode was attached to the tibial nerve for electrical stimulation. The mice were randomly allocated to one of two groups: G1 (control: 3 h -n=8 and 9 h -n=5) and G2 (treated with GaAlAs laser, λ660 nm, 35 mW, 0.6 J, 17 s: 3 h -n=6 and 9 h -n=5). Results: In G1 mice, the amplitude of the tetanic contracture in response to induced fatigue remained unchanged during six consecutive tetani. The amplitude of the tetanic contractions in response to electrical stimulation (4-8 mV) was also unchanged. These results indicated muscle intactness in response to the load imposed by tetanus. In G2 mice, there was an increase in the amplitude of contraction after 3 h and 9 h when compared to G1 at 83% tetanus. Conclusion: These results indicate that exposure of muscle to LLLT enhanced the contractile force and increased the resistance to muscle fatigue without causing morphological damage to cellular structures.

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“…Among the various ways to reduce fatigue, the application of low intensity laser (LIL) is promising but is still little known. Research has shown that the application of LIL in different protocols was able to increase the number of contractions and promote decreased creatine kinase (CK) activity or at least to promote a lower increment of muscle proteins activity in blood [2,3]. Another study showed that photobiomodulation with LIL associ-not applied before the exercise sessions or before the test.…”

Section: Introductionmentioning

confidence: 99%

Low Intensity Laser as an Adjuvant to Improve Muscle Strength after Exercise: A Case Report

Plapler¹,

Sugawara²,

Cássia³

et al. 2020

J Phys Med

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Muscle fatigue is a limiting factor in prosthetic patients and studies show that low intensity laser can improve performance and increase muscle strength. We tested a concentric exercise protocol comparing a test applied after 10 sessions without and with the use of laser using the Cybex Humac Norm® Test & Rehabilitation System in a patient with left lower limb amputation. First, a test was performed to determine the baseline value of peak torque, average power per repetition and total work performed. Ten exercise sessions and a new test were followed to determine the difference in power gain. Ten more sessions and a new test without laser application were performed to determine whether the torque increment level was reached, followed by ten more sessions with laser application 5 minutes before the exercise and a new test, with laser application, to evaluate the torque increment. An increase in PT was found of 5% for extensors and 7% for knee flexors in the second test in relation to baseline. The increase was 0% for the extensors and 11% for the flexors in the next test. After laser application there was an increase of 8% for the extensors and a deficit of 11% for the flexors. For TTR, the relative values for extenders and flexors were 3% and -3%, -10% and -2% (without laser) and 18% and 17% (with laser). We concluded that, in this protocol, the laser produced a gain in the peak torque of extensor muscles, but not of the flexors as well as a significant increase in the average power per repetition and the total work performed by both the extensors and the knee flexors, which may be of value as an adjuvant in the treatment of prosthetic patients.

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A laserterapia de baixa potência melhora o desempenho muscular mensurado por dinamometria isocinética em humanos

Cited by 11 publications

References 15 publications

Efeito Agudo Do Laser De Baixa Potência Na Fadiga Do Bíceps Braquial De Atletas De Voleibol

Efeito Agudo Do Laser De Baixa Potência Na Fadiga Do Bíceps Braquial De Atletas De Voleibol

Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function

Low Intensity Laser as an Adjuvant to Improve Muscle Strength after Exercise: A Case Report

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