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Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

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Postural dynamics and vocal effort: preliminary experimental analysis.

Antoine Giovanni¹, Leslie Akl, Maurice Ouaknine

¹Laboratoire d'Audio-Phonologie Expérimentale et Clinique de l'Université de la Méditerranée, Marseille, France. antoine.giovanni@ap-hm.fr

Folia Phoniatrica Et Logopaedica : Official Organ of the International Association of Logopedics and Phoniatrics (IALP)

|February 1, 2008

Summary

Increased vocal effort leads to greater body instability, measured by the root mean square of the velocity of variation of the center of pressure (VCOP rms). This finding suggests VCOP rms may help assess voice disorders noninvasively.

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Area of Science:

Biomechanics
Speech Science
Otolaryngology

Background:

Increased vocal effort is linked to whole-body stiffening and postural instability.
Postural instability may offer insights into vocal hyperfunction behaviors and causes.

Purpose of the Study:

To investigate the relationship between vocal effort and postural instability.
To assess if postural sway, quantified by VCOP rms, changes with vocal load and ambient noise.

Main Methods:

Utilized a posturography platform to measure the root mean square of the velocity of variation of the center of pressure (VCOP rms).
Evaluated postural sway under conditions including eyes open/closed, weight holding, normal vs. loud voice, and calm vs. noisy (Lombard effect) ambiance.

Main Results:

Body stiffening conditions (eyes closed, weight holding) significantly increased VCOP rms.
Vocal effort, particularly under noisy conditions (Lombard effect), markedly elevated VCOP rms (from 11.19 mm/s to 16.69 mm/s).

Conclusions:

Elevated vocal effort is associated with increased postural instability (VCOP rms) in most individuals.
VCOP rms shows potential as a noninvasive index for assessing voice pathology.