Background: Postural correlates of vocal effort are rarely described in the literature, while they are extensively dealt with in speech therapy. Objectives: This study aims at determining whether body movement is a side effect of vocal effort or an integral part of communication effort behavior. The answer to this question is mainly based on correlations between posture and phonation. Method: Twenty healthy subjects participated in this study. They had to communicate with a listener under 3 conditions requiring different levels of vocal effort. Results: The vocal parameters increased and confirmed that the subjects had made a vocal effort. The kinematic parameters (amplitude and duration of body movement) increased with vocal effort. Lastly, vocal and kinematic characteristics were significantly correlated. Conclusion: The close correlation of posture with vocal production shows that movement is not a mere consequence of vocal effort. Posture and voice are coordinated in communication behavior, and each body segment plays its specific role in the vocal effort behavior.

Keywords:
Posture, Phonation, Vocal effort
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© 2010 S. Karger AG, Basel
2010
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