title: Semi-occluded vocal tract exercises: aerodynamic and electroglottographic measurements in singers.
abstract: OBJECTIVE
  The purpose of this study was to describe changes in aerodynamic and electroglottographic (EGG) measures immediately after completing three semi-occluded vocal tract (SOVT) exercises.
  
  
  METHODS
  Prospective case series.
  
  
  METHODS
  Aerodynamic and EGG measurements were obtained before and immediately after performing three SOVTs (straw phonation, lip trill, and tongue trill) in four singers for prepost comparisons to evaluate laryngeal changes persisting beyond the execution of SOVTs.
  
  
  RESULTS
  Mean air flow, sound pressure level, and EGG closed quotient tended to increase after completing SOVTs. The magnitude of change and consistency of change in measures across the SOVTs varied from subject-to-subject.
  
  
  CONCLUSIONS
  Aerodynamic and EGG changes did occur during and immediately after completing SOVTs. However, there was marked variability within and across participants. Further investigation is needed to better understand which SOVTs are likely to benefit a particular individual.
authors.affiliation: Hearing and Speech Department, University of Kansas Medical Center, Kansas City, KS. Electronic address: troydargin@yahoo.com.
authors.forename: Troy Clifford
authors.initials: TC
authors.lastname: Dargin
authors.affiliation: Hearing and Speech Department, University of Kansas Medical Center, Kansas City, KS.
authors.forename: Jeff
authors.initials: J
authors.lastname: Searl
mesh_terms: D000328:Adult; D004568:Electrodiagnosis / Q000379:methods*; D005260:Female; D005931:Glottis / Q000502:physiology; D006801:Humans; D007830:Larynx / Q000503:physiopathology; D008297:Male; D010699:Phonation / Q000502:physiology*; D011312:Pressure; D011446:Prospective Studies; D063346:Singing; D013061:Speech Acoustics; D014059:Tongue / Q000502:physiology; D014827:Vocal Cords / Q000502:physiology*; D014831:Voice / Q000502:physiology*; D014833:Voice Quality; D014834:Voice Training
keywords: Aerodynamic; Electroglottography; Semi-occluded vocal tract; Singers