INTRODUCTION
One-third of the labor force works in professions in which voice
is the primary tool of work.1 They include broadcasters, call
center operators, court lawyers, teachers, business executives,
singers, actors, clergy, and tour guides. To these professionals,
the maintenance of vocal health is essential as voice is the critical
component of their work. Excessive use or abuse of the
voice at work can lead to the development of vocal symptoms
of weak voice, sore throat, and to the development of a voice
disorder.2
In the past, working conditions were not taken into account in
the etiology of voice problems. The behavioral nature of voice
was overemphasized as a factor in the development of a voice
problem, and the responsibility was attributed to the individual.
The impact of the working conditions was not considered nor
was the relationship between working conditions and voice.
There was no enough knowledge of the ergonomic and environmental
aspects of voice disorders as an occupational health
problem.3
The World Health Organization recognizes that work and
health interact with one another. When work is fully adapted
to human goals, capacities, and limitations and occupational
health hazards are under control, work plays a role in promoting
both physical and mental health. The work environment and its