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Previous issue date: 2010-11-03 / To analyze the effects of electrical stimulation at two frequencies on the EMG parameters (EMG) and dynamometer, in muscles with different typing. MATERIALS AND METHODS: This is a controlled clinical trial, randomized and double blind. Sixty healthy volunteers (23.6 ? 4.2anos; 54.2 ? 7.7kg, 1.62 ? 0.009 cm) of both sexes were divided randomly into three groups: control group (CG), experimental group 1 (SG1) with application of the current Russian 30 HZ and experimental group 2 (EG2) at 70 Hz The volunteers performed an initial assessment (AV1) on the isokinetic dynamometer with three repetitions maximum voluntary isometric (MVC) for knee extension concomitant uptake of EMG for the VM muscle, VL and RF. Later, after application of NMES, they underwent an experimental protocol of isometric fatigue using 70% of MVIC, ending with the completion of a final assessment (AV2) in the same manner as the AV1. RESULTS: By analyzing the profile of the 60 subjects in three broad, VM showed a higher value of RMS behavior when the VL and RF (p = 0.03 and p = 0.02). With respect to Fmed the RF muscle (p = 0.001) showed a higher value for the VM. The VM muscle showed significant increases of Fmed (p = 0.05) after electrical stimulation at 70 Hz when compared the AV1 AV2 and RF showed significant decreases (p = 0.009) after stimulation at 30 Hz during the fatigue showed an increase RMS in the VM and VL, with a reduction in RF. For the variable Fmed was observed in three broad decline during fatigue. CONCLUSION: Our findings provide evidence that the muscles VM, VL and RF fiber typing are different besides indicating that the frequency of NMES tend to relate to the muscle stimulated. Finally suggests the surface EMG as a noninvasive method for characterizing muscle / OBJETIVO: Analisar os efeitos da eletroestimula??o sobre os par?metros eletromiogr?ficos e dinamom?tricos do m?sculo quadr?ceps. MATERIAIS E M?TODOS: Trata-se de um ensaio cl?nico controlado, randomizado e duplo cego. Sessenta volunt?rios saud?veis (23.6?4.2anos; 54.2?7.7Kg; 1,62?0,009cm) de ambos os sexos foram divididos aleatoriamente em tr?s grupos: grupo controle (GC), grupo experimental 1 (GE1) com aplica??o de corrente russa a 30 HZ e grupo experimental 2 (GE2) a 70 Hz. Os volunt?rios realizaram uma avalia??o inicial (AV1) no dinam?metro isocin?tico com 3 repeti??es isom?tricas volunt?rias m?ximas (CIVM), para extens?o do joelho concomitante a capta??o da EMG para os m?sculos vasto medial (VM), vasto lateral (VL) e reto femoral (RF). Posteriormente, ap?s aplica??o da eletroestimula??o neuromusuclar (EENM) foram submetidos a um protocolo experimental de fadiga isom?trica utilizando 70% da CIVM, finalizando com a realiza??o de uma avalia??o final (AV2), nos mesmos moldes da AV1. A an?lise dos dados se deu atrav?s da utiliza??o do programa estat?stico SPSS for Windows (Statistical Packege For the Social Sciense) 17.0 e foram utilizados Anova one way nas compara??es entre os grupos e teste t pareado nas compara??es dentro dos grupos. RESULTADOS: Ao analisar o perfil dos 3 vastos nos 60 sujeitos, o VM apresentou um maior valor de RMS quando comportamento ao VL e RF (p=0,03 e p=0,02). Com rela??o a Fmed, o m?sculo RF (p=0,001) apresentou maior valor comparado ao VM. O m?sculo VM apresentou aumentos significativos da Fmed (p=0,05) ap?s eletroestimula??o a 70 Hz quando a AV1 foi comparada a AV2 e o RF apresentou quedas significativas (p=0,009) ap?s estimula??o a 30 Hz. Durante a fadiga observou-se aumento do RMS no VM e VL, com redu??o no RF. Para a vari?vel Fmed observou-se queda nos tr?s vastos durante a fadiga. CONCLUS?O: Os achados deste estudo sugerem que os m?sculos VM, VL e RF possuem tipagens de fibras diferentes al?m de indicar que as frequ?ncias de EENM tendem a se relacionar com o m?sculo estimulado. Por fim sugere a EMG de superf?cie como um m?todo n?o invasivo para caracteriza??o muscular
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/16694 |
| Date | 03 November 2010 |
| Creators | Farias, Rafaela Soares de |
| Contributors | CPF:58440097468, http://lattes.cnpq.br/2238444079880883, Ferreira, Jos? Jamacy Almeida, CPF:24372110472, http://lattes.cnpq.br/7942403520160630, Serr?o, Fabio Viadanna, CPF:17033069880, http://lattes.cnpq.br/8137335642635433, Brasileiro, Jamilson Sim?es |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Fisioterapia, UFRN, BR, Movimento e Sa?de |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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