How to prevent vocal fatigue?

The first and most important strategy is achieving a good level of hydration combined with the development of correct vocal technique that helps use the voice without strain. It’s also important to recognize the signs of fatigue and alteration; maintain body euphony; have good postural control; use an effective breathing pattern and know how to project the voice effortlessly; manage emotional stress; avoid a monotonous voice and use an appropriate vocal rhythm.

There are studies in the literature about the expected recovery time after excessive strain, showing that the average phonation threshold is around one hour, while perceived phonatory effort lasts for a day. However, it’s important to note that there is significant variability between individuals.

Measuring vocal fatigue is difficult, as there are no standardized procedures for its assessment.

It would require a series of neuromuscular and biomechanical data that can only be obtained through invasive examinations. Vocal fatigue has mostly been studied through targeted vocal effort induction among voice professionals. Data have generally been collected through aerodynamic acoustic measurements, comparing vocal performance before and after the vocal load. However, these results are not conclusive. For instance, jitter and shimmer values significantly increase in some individuals after fatigue, while others show no such changes.

Several studies have reported that the Fundamental Frequency (F0) increases with vocal fatigue, while other research suggests the opposite. An increase in transglottal airflow, a decrease in maximum phonation time, and incomplete glottal closure have generally been associated with vocal fatigue.

The phonation threshold pressure has been studied as a possible indicator of changes in vocal tissue viscosity during vocal fatigue (biomechanical changes). Other studies show that hydration is important in regulating vocal tissue viscosity and that viscosity is directly related to phonation pressure.

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Valentina Carlile - Osteopath specializing in Osteopathy for Voice and Speech Disorders since 2002. For information and bookings, visit the Contact page.

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