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      A influência do laser 830 nm no desempenho do salto de atletas de voleibol feminino Translated title: The influence of the 830 nm laser on the jump performance of female volleyball athletes

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          Abstract

          INTRODUÇÃO: Estudos demonstram que laserterapia pode melhorar o desempenho muscular e retardar o processo de fadiga muscular. Contudo poucos estudos referem-se à quantificação do desempenho por meio da biofotometria. O objetivo desse estudo é verificar os possíveis efeitos da fototerapia em relação a atividade e fadiga muscular. MÉTODOS: Foi realizado um ensaio clínico duplo-cego controlado randomizado com sete indivíduos adultos, atletas universitárias de voleibol feminino, saudáveis. A atividade muscular foi quantificada por meio da eletromiografia e os saltos pela biofotometria. A laserterapia (830nm, 30mW, 11J /ponto e 22 segundos) foi realizada no músculo tríceps sural a cada 3 cm² totalizando uma média de 20 pontos. Empregou-se o teste de Kolmogorov-Smirnov para análise da distribuição dos dados. RESULTADOS: Após o teste de normalidade o teste t-Student foi aplicado, considerando-se um nível de significância de 5% (p < 0,05). Não foi observada influência do laser em relação às variáveis estudadas. CONCLUSÃO: Apesar de muitos estudos demostrarem a correlação da fototerapia com a atividade muscular e fadiga, este estudo não apontou qualquer correlacão da laserterapia com a atividade e fadiga muscular.

          Translated abstract

          INTRODUCTION: Studies show that laser therapy can increase muscle performance and delay the process of muscle fatigue. However, few studies have reported photogrammetry as a tool to analyze muscle performance. The objective of this study was to assess the possible effects of phototherapy in relation to activity and muscle fatigue. METHODS: We performed a crossover, randomized, double-blind, controlled trial with seven healthy female volleyball players. The muscle activities were quantified through electromyography, and jumps were quantified through photogrammetry Laser therapy (830 nm, 30 mW, 11 J per point and 22 seconds) was carried out on 3 cm² triceps surae muscle for an average of 20 points. The Kolmogorov-Smirnov test was used to analyze data distribution. RESULTS: After testing for normality, the Student t test was applied, considering a significance level of 5% (p <0.05). The laser had no effect with respect to the variables studied. Interestingly, a significant difference in motor recruitment values of the lateral gastrocnemius muscle was observed during plantarflexion movement. CONCLUSION: Although many studies have shown a correlation of phototherapy with muscle activity and fatigue, this study found no correlation of laser therapy with muscle activity or fatigue.

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          Most cited references27

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          Biomechanics and Motor Control of Human Movement

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            Muscle fatigue: from observations in humans to underlying mechanisms studied in intact single muscle fibres.

            Prolonged dynamic exercise and sustained isometric contractions induce muscle fatigue, as manifested by decreased performance and a reduction in the maximum voluntary contraction force. Studies with non-invasive measurements in exercising humans show that mechanisms located beyond the sarcolemma are important in the fatigue process. In this review, we describe probable cellular mechanisms underlying fatigue-induced changes in excitation-contraction (E-C) coupling occurring in human muscle fibres during strenuous exercise. We use fatigue-induced changes observed in intact single muscle fibres, where force and cellular Ca(2+) handling can be directly measured, to explain changes in E-C coupling observed in human muscle during exercise.
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              Atlas de anatomia humana

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbeb
                Revista Brasileira de Engenharia Biomédica
                Rev. Bras. Eng. Bioméd.
                SBEB - Sociedade Brasileira de Engenharia Biomédica (Rio de Janeiro )
                1517-3151
                June 2013
                : 29
                : 2
                : 199-205
                Affiliations
                [1 ] Universidade do Vale do Paraíba Brazil
                [2 ] Instituto Superior de Educação do Centro Educacional Nossa Senhora Auxiliadora Brazil
                Article
                S1517-31512013000200010
                10.4322/rbeb.2013.020
                e9998525-9c1e-412a-aa4c-0c99b2e85f0d

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1517-3151&lng=en
                Categories
                ENGINEERING, BIOMEDICAL

                Biomedical engineering
                Laser therapy,Photogrammetry,Muscle performance,Muscle active,Fatigue,Laserterapia,Biofotometria,Desempenho muscular,Atividade muscular,Fadiga

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