Efeitos imediatos do alongamento global na retração da cadeia muscular porterior-resposta eletromiografica, dinamometria e avaliação postural

AUTOR(ES)

Lilian Calili Camargo

DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this research was to verify the changes in the muscular function and corporal posture induced by global stretching. For this purpose, analyses of the electromyographic activity of the iliocostalis lumborum muscle and of the torque of the paraspinal muscles in the isometric extension of the trunk were carried out, and the body posture of individuais with retraction of the posterior muscular chain, having been subjected to a session of global stretching, were evaluated. Sixteen volunteers from the State University of Campinas community were evaluated (8 males and 8 females), with an average age of 23.13 years (:t 2.19). The volunteers composing the experimental group were first evaluated radiologically. Subsequently, postural, electromyographic and dynamometric evaluations were performed, before and immediately after the practice of postural stretching to evaluate the effects of the interventions. The elongation posture was executed standing and with closed coxofemural angle. For the electromyographic evaluation, an electromyograph EMG-800C (EMG Systems do Brasil@),enabled for a load cell of 200Kgf, composed of 4 channels, sampling frequency of 2000 Hz, Butterworth filters with frequency bands between 20 and 500Hz and gain of 2000 times in the electromyograph channels were used. Active bipolar surface electrodes, type Ag-AgCI, positioned bilaterally over the iliocostalis lumborum muscle at levels L2-L3, were used for the signal reception. The dynamometric and electromyographic readings were carried out during tests of the counter resisted. extension movement of the trunk in prono decubitus and in the upright position. The results revealed significant improvement in the flexibility of the posterior muscular chain, decrease in the torque of the paraspinal muscles and an increase of the electrical activity of the iliocostalis lumborum muscle, after stretching. No significant alterations in the corporal posture of the volunteers were observed

ASSUNTO(S)

exercicios de alongamento dynamometer human posture eletromiografia dinamometro postura humana - exercicios electromyography

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