title: A Preliminary Comparison of Laryngeal Manipulation and Postural Treatment on Voice Quality in a Prospective Randomized Crossover Study.
abstract: BACKGROUND
  This crossover study compared the effects of two osteopathic treatments specific laryngeal manipulation (SLM) and postural manual therapy (PMT) on voice quality and pitch.
  
  
  METHODS
  Twelve asymptomatic singers were measured acoustically immediately before and immediately after each intervention using a laryngograph. Fundamental frequency and the glottal closing quotient were used to determine any differences between groups before and after.
  
  
  RESULTS
  Fundamental frequency showed a statistically significant change following both interventions (combined [P = 0.007] and PMT and SLM individually (P = 0.0143, P = 0.018, respectively). Although the benefit demonstrated using SLM was greater than that with PMT (2.4, 2.02, respectively), following Bonferroni correction there was no statistical significance demonstrated between the two groups. There was no statistically significant change with glottal closing time for any intervention or at any time (P = 0.52).
  
  
  CONCLUSIONS
  This pilot study provides evidence of the benefit for both SLM and PMT in singers. A significant difference was found in the voice quality of the participants involved in both PMT and SLM. These results set the way for further larger scale studies to evaluate group interactions and potential benefits in symptomatic patients.
authors: British College of Osteopathic Medicine (BCOM), 120-122 Lief House, Finchley Road, London, United Kingdom.
authors: Elliot J
authors: EJ
authors: Kennard
authors: British College of Osteopathic Medicine (BCOM), 120-122 Lief House, Finchley Road, London, United Kingdom.
authors: Jacob
authors: J
authors: Lieberman
authors: British College of Osteopathic Medicine (BCOM), 120-122 Lief House, Finchley Road, London, United Kingdom.
authors: Arjmand
authors: A
authors: Saaid
authors: British College of Osteopathic Medicine (BCOM), 120-122 Lief House, Finchley Road, London, United Kingdom. Electronic address: work@kerstinrolfe.com.
authors: Kerstin J
authors: KJ
authors: Rolfe
mesh_terms: D000293:Adolescent; D000328:Adult; D018592:Cross-Over Studies; D055154:Dysphonia / Q000628:therapy*; D005260:Female; D006801:Humans; D007830:Larynx / Q000502:physiology*; D008297:Male; D026301:Manipulation, Osteopathic; D011187:Posture / Q000502:physiology*; D011446:Prospective Studies; D014833:Voice Quality; D055815:Young Adult
keywords: Functional dysphonia; Osteopathy; Postural manual therapy; Specific laryngeal manipulation