Investigation of the Relationship Between Vocal Fatigue, Quality of Life, and Compliance With Vocal Hygiene in Professional Voice Users

Vocal Fatigue and Its Relationship with Vocal Hygiene and Work-Related Factors in Professional and Nonprofessional Voice Users: A Multiple Linear Regression Model Study

OBJECTIVES

To investigate vocal fatigue severity between professional voice users (PVUs) and nonprofessional voice users (NPVUs), and across different levels of voice users. Also to examine the relationship between vocal hygiene and work-related factors with vocal fatigue.

METHODS

This is a cross-sectional descriptive study. Four hundred one individuals from different professions were included in total. Participants were divided into four levels of voice users by classification of Koufman and Isaacson. The top three levels of voice users further identified as PVU, and level 4 voice users identified as NPVU. An online questionnaire which included vocal hygiene checklist, work-related factors, and Turkish version of vocal fatigue index (VFI) was submitted by the participants.

RESULTS

Vocal fatigue severity of PVUs were found higher than NPVUs in all VFI scores (P < 0.05). Level 2 voice users were found to have more vocal fatigue severity than all other levels of voice users. Call center workers (CCWs) had the highest means of vocal fatigue severity. Based on the multiple linear regression model vocal hygiene and the number of vocal rest breaks were found to have related with vocal fatigue the most (P < 0.05). There was also a relation with some VFI scores (P < 0.05) with voice usage duration at work and vocal rest duration. We found no relationship between working experience and vocal fatigue. The data suggests the relation between vocal fatigue and vocal hygiene, and work-related factors explain a small proportion of the association. However, in CCWs r2 was found 0.44.

CONCLUSIONS

The change in vocal fatigue severity did not match with Koufman and Isaacson's classification of voice users. We suggest that there may be other contributing factors to vocal fatigue than vocal hygiene, vocal rest, and voice usage duration even those factors may differ from profession to profession.

Examination of Voice Perception and Voice Fatigue in Call Center Employees

OBJECTIVES

Call center employees are professional voice users and use their voices extensively while performing their professional functions. The purpose of this study is to examine whether a higher occupational voice burden among call center employees affects voice fatigue and perception.

METHODS

A total of 114 adult individuals working in call centers who were not diagnosed with any voice disorder (study group, n = 57) and who were not professional voice users (control group, n = 57) were included in this study. Demographic information, the Voice Fatigue Index (VFI), and the Voice Handicap Index-10 (VHI-10) were administered to all participants. Sub-factors of the VFI, such as tiredness and avoidance of voice use (factor 1), physical discomfort after voice use (factor 2), and improvement in symptoms with rest (factor 3), were also examined.

RESULTS

Each group included 71.9% females (n = 41) and 28.1% men (n = 16). The scores of VFI factor 1, VFI factor 2, 3, VFITOTAL, and VHI-10 in the study group were statistically higher than those in the control group. The average VFI factor 2, VFI factor 3, and VFITOTAL scores of females in the study group were considerably greater than the average scores of men. The VFI and its sub-factors, as well as the VHI-10 scores of the study group whose daily working hours were 8 hours or less and 8 hours or more, did not vary significantly.

CONCLUSIONS

It has been observed that call center employees experience voice fatigue, which has an impact on voice perception in their professional functions. As a result of their heavy vocal load, contact center workers may be at a higher risk of acquiring voice disorders. Voice fatigue must be taken into account in the assessment and intervention of contact center employees by professionals and therapists working in the field of voice.