Estudo eletromiografico dos musculos iliocostal lombar, semitendineo e biceps da coxa (cabeça longa) no vita-house

AUTOR(ES)

Maria Rita Masselli

DATA DE PUBLICAÇÃO

1995

RESUMO

The purpose of this study was to examine the influence of the subject position on Vita-house (equipment offitness) ofthe iliocostalis lumborum and hamstring signal EMG. The equipment called Vita-Jwuse has a hinge on the board, upon which the subject could either lie prone (plain table), or over which the subject could be draped, as the board hinged at its center (tilt table). The tilt table provides 42 degrees of hip flexion and flattening lumbar lordosis, which place ali these muscles in stretching. Twenty two healty volunteers of both sexes, no sedentary, were studied electromyographicalIy using surface electrode. The volunteers performed two isometric contractions at angles of 30 and 60 degrees of knee flexion against resistances of 5 and 10 kg. The angles were controled by using a electrogoniol1).eter. Analysis of variance and complementary Tukey s test were used to study the repeated measures design involving the four factors (table, muscle, angel and sex). The results demonstrate that the sex factor do not determinded different signal EMG. The electrical signal colIected from semitendinous muscle were significantly higher than biceps femoris muscle. The signal EMG colIected at angle of 60 degrees of knee flexion were higher than at angle of 30 degrees, maybe because the resistance force at 60 degrees is higher than at angle of 30 degrees. Comparison of the table, involving the comparison ofthe two forms (plain and tilt) demonstrate, as expected, that the signal EMG at the plain table exceed significantly the signal at the tilt table, for the thre examined muscles. The results suggest that the hamstring should be tested and exercised with the hip flexed (in tilt table) to allow for maximal torque development, and to take advantage of the length-tension relationship of the muscle and to prevent appearance of the low back pain.

ASSUNTO(S)

eletromiografia musculos

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