Lumbo-pelvic stability and electromyography of abdominal muscles in ballet dancers

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Data

2009-11-01

Autores

De Faria Negrão Filho, Rúben [UNESP]
Alves Silva, L. [UNESP]
Lombardi Monteiro, T. [UNESP]
Alves, Neri [UNESP]
Cesinando de Carvalho, A. [UNESP]
Mícolis de Azevedo, F. [UNESP]

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Resumo

Evaluating the ability to rectify and maintain lumbar adjustment can contribute toward the understanding of the behavior of abdominal muscles and their participation in the stability of pelvic muscles in dancers during the posterior pelvic tilt and double straight leg lowering tests. Nine healthy volunteers (male and female ballet dancers; age mean: 25.9 ±7.37 years) underwent maximal isometric voluntary contraction (MIVC), isometric voluntary contraction at 50% of MIVC, posterior pelvic tilt (PPT) and double straight leg lowering (DSLL) tests. The tests were carried out in a single day, with 3 repetitions each. During the tests, electromygraphic signals of the rectus abdominis, obliquus internus and obliquus externus were recorded. The signal acquisition system was made up of bipolar surface electrodes, electrogoniometer and an electromechanic device (pressure sensor), which were connected to a signal conditioner module. Root mean square values of each muscle during the DSLL and PPT were converted into percentage of activation of 50% MIVC. Lower back pressure was submitted to the same process. ANOVA with repeated measures was performed, with the level of significance set at p < 0.05. The results revealed that all dancers were able to maintain posterior pelvic tilt and there was trend toward greater activation of the bilateral obliquus internus muscle. In an attempt to keep the pelvic region stabilized during DSLL, there was a greater contribution from the obliquus externus muscle in relation to other abdominal muscles.

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Palavras-chave

Abdominal muscles, Electromyography, Stability lumbar, abdominal wall musculature, adult, ballet dancer, controlled study, electromyography, female, human, male, muscle contraction, rectus abdominis muscle, Abdominal Muscles, Adolescent, Adult, Dancing, Female, Humans, Isometric Contraction, Leg, Male, Muscle, Skeletal, Pelvis, Postural Balance, Young Adult

Como citar

Electromyography and Clinical Neurophysiology, v. 49, n. 8, p. 377-384, 2009.