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INTRODUCTION: The objective was to study the behavior of the larynx during shouted voice production, when the larynx is exposed to extremely high subglottic pressure. MATERIALS AND METHODS: The study involved electroglottographic, acoustic, and aerodynamic analyses of shouts produced at maximum effort by three male participants. RESULTS AND DISCUSSION: Under a normal speaking voice, the voice sound pressure level (SPL) is proportional to the subglottic pressure. However, when the subglottic pressure reached high levels, the voice SPL reached a maximum value and then decreased as subglottic pressure increased further. Furthermore, the electroglottographic signal sometimes lost its periodicity during the shout, suggesting irregular vocal fold vibration.
Lagier et al. (Tue,) studied this question.