Vocal effort is a quantity varied by speakers when adjusting to an increase or decrease in the communication distance. The communication distance is the distance between the speaker and the listener. Vocal effort is a subjective

physiological Physiology (; ) is the science, scientific study of function (biology), functions and mechanism (biology), mechanisms in a life, living system. As a branches of science, subdiscipline of biology, physiology focuses on how organisms, organ syst ...

quantity, and is mainly dependent on subglottal pressure,

vocal fold In humans, the vocal cords, also known as vocal folds, are folds of throat tissues that are key in creating sounds through Speech, vocalization. The length of the vocal cords affects the pitch of voice, similar to a violin string. Open when brea ...

tension, and jaw opening. Vocal effort is different from

sound pressure Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophon ...

. To measure vocal effort, listeners are asked to rate the distance between the speaker and the addressee. Repeated vocal effort can lead to chronic vocal pathologies. Several professional occupations requiring heavy vocal use, such as sport and fitness instructor, have been associated with an increase in developing vocal pathologies

References

Phonetics Human voice Phonation Speech {{phonetics-stub