Cristine L. Alberton
Eduardo M. Silva
Eduardo L. Cadore
Marcelo Coertjens
Paulo O. Beyer
Luiz F. Marocco
Luiz F. M. Kruel
Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
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RESUMO
O objetivo do presente estudo foi verificar alterações no sinal eletromiográfico (EMG) durante contrações isométricas realizadas nos meios aquático e terrestre. Oito mulheres (23 ± 1 anos) realizaram contrações isométricas voluntárias máximas em um dinamômetro isocinético para o registro do pico do torque dos extensores do joelho e do sinal EMG do músculo vasto lateral (flexão do joelho em 90°) com e sem isolamento sobre os eletrodos de superfície. Em seguida, outra contração voluntária máxima foi realizada contra resistência fixa nos meios terrestre e aquático. Para a análise estatística utilizou-se o Teste T pareado, com a=0,05 (SPSS versão 11.0). Nenhuma diferença significativa foi encontrada entre os valores rmsEMG para o vasto lateral nas situações com (0,560 ± 0,118 mV) e sem (0,538 ± 0,110 mV) isolamento (p=0,306), para valores de pico de torque similares (p=0,191). Os mesmos resultados foram encontrados comparando os meios terrestre (0,428 ± 0,054 mV) e aquático (0,388 ± 0,105 mV) (p=0,446). O uso de adesivos resistentes à água não alterou o sinal EMG. Além disso, não houve diferenças nos valores rmsEMG durante a contração voluntária máxima realizada nos meios aquático e terrestre, sugerindo que o meio não influenciou a amplitude do rmsEMG.
Palavras-chave: Eletromiografia, imersão, isolamento.
ABSTRACT
Electromiographic responses induced by superficial electrodes isolation and by immersion.
The objective of the present study was to verify the electromiographic (EMG) signal alterations during isometric actions performed in water and on land. Firstly, 8 women (23 ± 1 yrs) performed maximal voluntary isometric actions in a isokinetic dynamometer to record the peak torque for knee extensors and the EMG signal of the vastus lateralis muscle (90° knee flexion) with and without superficial electrodes isolation. Subsequently, another maximal isometric action was performed against fixed resistance on land and in water immersion. For statistical analysis a paired T-Test was used, with a=0.05 (SPSS vs 11.0). No significant difference was found between vastus lateralis rmsEMG values for situations with (0.560 ± 0.118 mV) and without (0.538 ± 0.110 mV) isolation (p=0.306), for similar peak torque values (p=0.191). The same results were found comparing on land (0.428 ± 0.054mV) and in water immersion (0.388 ± 0.105 mV) situations (p=0.446). The water-resistant adhesive taping did not alter the EMG signal. Based in this finding, we found no differences on rmsEMG values during maximal isometric actions performed both in water and on land, suggesting that the environment did not influence the rmsEMG amplitude.
]]> Key-words: Electromyography, immersion, isolation
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CORRESPONDÊNCIA
Cristine Lima Alberton
Grupo de Pesquisa em Atividades Aquáticas e Terrestres
Laboratório de Pesquisa do Exercício, Escola de Educação Física – Universidade Federal do Rio Grande do Sul
Rua Felizardo, 750 – Bairro Jardim Botânico – CEP 90690-200 – Porto Alegre/RS.
Telefone: 0055 (51) 3308-5820
E-mail: tinialberton@yahoo.com.br
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