title: Electrical activity of extrinsic laryngeal muscles in subjects with and without dysphonia.
abstract: OBJECTIVE
  To compare dysphonic individuals to nondysphonic with regards to electrical activity of extrinsic laryngeal muscles related to perceptual and acoustic vocal parameters.
  
  
  OBJECTIVE
  Dysphonic individuals have higher electrical activity in the supra and infrahyoid muscles than those nondysphonic.
  
  
  METHODS
  Prospective, cross-sectional, case series study.
  
  
  METHODS
  Forty-one subjects, divided into two groups according to the presence of dysphonia, underwent evaluation of surface electromyography, auditory-perceptual, and acoustic evaluations of voice during the vocal rest and sustained emissions of the vowel /ε/ and count of 20 to 30 at usual and strong intensities.
  
  
  RESULTS
  The dysphonic group differed significantly from the nondysphonic by (1) lower electrical activity normalized by the maximum sustained voluntary activity evaluated in all tasks of phonation in the suprahyoid group; (2) lower recruitment of electrical activity in emissions of strong intensity compared with those of usual intensity in the suprahyoid muscles to emit the vowel /ε/ (13.66 ± 5.17 in dysphonic group and 35.20 ± 7.60 in the nondysphonic group, P = 0.029) and in the infrahyoid muscles in the count of 20 to 30 (14.90 ± 4.69 vs. 42.01 ± 6.15; P < 0.001) and to emit the vowel /ε/ (11.47 ± 6.52 vs. 22.66 ± 9.05, P < 0.001); (3) lower vocal intensity to produce the vowel /ε/ in usual and strong intensities and count in strong intensity. The electrical activities of the maximum sustained voluntary activity were reduced with increasing degree of dysphonia.
  
  
  CONCLUSIONS
  There was lower electrical activity of the extrinsic laryngeal muscles in dysphonic individuals compared with nondysphonic, and related to the degree of dysphonia.
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil. Electronic address: pbalata@uol.com.br.
authors: Patricia Maria Mendes
authors: PM
authors: Balata
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
authors: Hilton Justino
authors: HJ
authors: Silva
authors: Speech and Language Department, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.
authors: Leandro Araújo
authors: LA
authors: Pernambuco
authors: Institute of Human Sciences, Communication and Arts, Universidade Federal de Alagoas, Maceió, Alagoas, Brazil.
authors: Geová Oliveira
authors: GO
authors: Amorim
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
authors: Renata Souto Maior
authors: RS
authors: Braga
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
authors: Elthon Gomes
authors: EG
authors: Fernandes da Silva
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
authors: Leilane Maria de
authors: LM
authors: Lima
authors: Speech and Language Department, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
authors: Sílvia Regina Arruda
authors: SR
authors: Moraes
mesh_terms: D000328:Adult; D055154:Dysphonia / Q000503:physiopathology*; D004576:Electromyography; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D007821:Laryngeal Muscles / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged
keywords: Acoustic analysis; Dysphonia; Electromyography; Phonation