Related Experiment Video
Updated: Jul 22, 2026

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
Published on: November 25, 2017
Determination of laryngeal muscle tension in professional singers
1Phoniatric Department and Voice Research Laboratory, Krasnoyarsk Opera House and Conservatory, Russia.
Abstract:
In order to study internal laryngeal muscular tension, 60 opera singers were examined. We determined the EGG quasi-open quotient (QOQ) by means of a crescendo singing task. The region between low (QOQ in 'piano') and high vocal intensity (QOQ in 'forte') is called volume of the QOQ. It was revealed that the volume of the QOQ is a reliable indication of the laryngeal muscular tension of the singers. This method reveals the early stages of muscular tension disturbances before objective changes in the larynx are present.
Related Concept Videos
Assessment of Airway, Skin Color, and Use of Accessory Muscles
Introduction
The initial evaluation of a patient's respiratory system...
Skeletal Muscle Relaxants: Therapeutic Uses
Relaxation of Skeletal Muscles
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
Muscles of the Anterior Neck
Larynx
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids, corniculates, and...
Alterations in Muscle Tone lll

