The effect of sound field amplification systems on vocal demand response in teachers during lessons.

Purpose: Sound pressure level (SPL), fundamental frequency (F), time dose (D), cycle dose (D), and distance dose (D) are components affecting a vocal demand response. The study aimed to investigate the impact of sound field amplification systems (SFAS) on teachers' vocal parameters and determine the user comfort of SFAS use in teachers.

Methods: Twenty female teachers underwent long-term voice dosimetry with Vocal Holter Med (PR.

Choral Conductors Vocal Loading in Rehearsal Simulation Conditions.

Objectives: Choir conductors represent a profession with an intensive vocal load. The present study aims to investigate the impact of 40 minutes vocal loading tasks on fundamental frequency (F0), jitter (Jitt), shimmer (Shim), median cepstral peak prominence (CPPs), and CPPs standard deviation in specific acoustic conditions.

Method: Eighteen amateur choir conductors (13 female, five male) participated in the study.