Atividade eletrica dos musculos esternocleidomastoideo e trapezio - fibras superiores em individuos normais e disfonicos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

The purpose of the present study was to evaluate bilateral electric activity of muscles sternocleidomastoid (SCM) and superior fibers of trapezius (SFT) in clinicalIy normal and dysphonic subjects during rest and phonation. The electric activity was measured in 20 female subjects, divided into two groups: the Control Group consisting of 10 subjects aged between 21 and 47 years (x = 25.7; SD = 7.3), without voice complaints and with normal voice, and the Dysphonic Group with 10 subjects aged between 17 and 42 years (x = 28.8, SD = 7.2), whose main complaint was hoarseness and who had otorhinolaryngologic exams confirming bilateral nodules and chink at phonation. Fhe situations analyzed were rest, spontaneous and sequenced speech, emission of vowels /a/,/i/ and /u/ and fricative consonants /s/ and /z/, and counting. The electric activity was measured by an Analogic/Digital Converter A/D (LYNX), a Software for Data Acquisition and simple differential active electrodes. The electric sign was calculated by the Root Mean Square (RMS) in `mu´V and normalized as percentage of Maximum Voluntary Isometric Contraction - neck flexion for SCM muscle and shoulder elevation for SFT. The data were statistically analyzed by variance analysis (ANOVA) and Tukey s test, with significance level of 0.05. The results showed that there were no statistically significant differences among the phonatory situations analyzed for both groups. There was electric activity of the muscles studied significantly larger in the situation of spontaneous speech than at rest for both groups (p=0,005). In the Control Group, there were no significant differences between left and right EMC muscles (p = 1.000), in all situations analyzed, whereas right SFT muscle showed more activity than left SFT (p = 0.0001). In the Dysphonic Group, there were no statisticalIy significant differences between left and right SCM and left and right SFT in all analyzed situations. The Dysphonic Group showed more electric activity than the Control Group for left and right SCM muscles and the left: SFT muscle in all analyzed situations (p = 0.0001); however, there were no statisticalIy signiflcant differences between the electric activity of right SFT muscles for both groups. The results of the present study suggest the right SFT muscle had more electric activity for control group in alI analyzed situations. The bilateral nodules and chink subjects, mainly women, use more anterior neck musculature and cervical paravertebral musculature than normal voice subjects during rest and phonation. Surface electromyography was na important instrument of muscular activity evaluation in hiperkinetic dysphonia whereas confirmed the reports of the literature

ASSUNTO(S)

ombro fala eletromiografia pescoço

ACESSO AO ARTIGO

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