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[Vocal forcing and posture: experimental studies on normal subject].

A Giovanni1, C Assaiante, A Galmiche

  • 1CHU Timone, Laboratoire d'Audio-Phonologie Expérimentale et Clinique de l'Université de la Méditerranée, Service d'ORL, EA-2668. 13385 Marseille cedex 5, France. antoine.giovanni@ap-hm.fr

Revue De Laryngologie - Otologie - Rhinologie
|April 12, 2007
PubMed
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Vocal forcing, or voice strain, increases antero-posterior trunk and head movements. This study quantifies increased postural muscle tension and center of pressure variance during voice forcing, confirming these movements.

Area of Science:

  • Biomechanics of speech production
  • Human physiology
  • Postural control

Background:

  • Vocal forcing is associated with characteristic postural changes, including increased antero-posterior movements of the trunk and head during phonation.
  • Understanding these movements is crucial for diagnosing and treating voice disorders.

Purpose of the Study:

  • To objectively explore the physiological basis of antero-posterior movements during vocal forcing in normal subjects.
  • To quantify the impact of voice strain on postural control and muscle tension.

Main Methods:

  • Physiological experiments were conducted on normal subjects.
  • Posturography was used to measure the displacement of the center of pressure (VCOP rms).
  • Movement analysis equipment (ELITE) was employed for complementary data collection.

Related Experiment Videos

Main Results:

  • Experiments confirmed increased muscle tension in postural muscles during vocal forcing due to ambient noise.
  • The VCOP rms index significantly increased from 13.19 (normal voice) to 18.63 (forced voice).
  • Contemporary antero-posterior movements associated with vocal forcing were confirmed.

Conclusions:

  • The study validates the existence of antero-posterior movements during vocal forcing.
  • Findings have potential applications in the clinical management of dysfunctional dysphonia.
  • Objective data on postural changes during voice strain can inform therapeutic strategies.