Translation and Adaptation of the Vocal Fatigue Index into Spanish

Traducción y adaptación del Índice de Fatiga Vocal al español


Aim: the purpose of this study was to translate and adapt the English version of the Vocal Fatigue Index (VFI) into the Spanish language.

Methods: the English version of the Vocal Fatigue Index (VFI) was translated into Spanish by two bilingual speech-language pathologists, and then was back-translated into English. The Spanish VFI (o “Índice de Fatiga Vocal”, IFV) was administrated to a pilot group of 10 individuals, which revealed some small typographical and grammatical adjustments to the index. The final updated version was then administrated to 34 subjects (21 with voice disorders, and 13 without voice disorders). Internal consistency and scale reliability were analyzed using Cronbach alpha coefficient.

Results: a high Cronbach alpha coefficient for the three factors (0.87) was obtained. The results of the item role in reliability of the Spanish VFI demonstrated that all of them showed a positive role according to this criterion. The results of the ANOVA indicate a statistically significant difference between groups on the three scores of the Spanish translation of the VFI. In comparison to the healthy participants, those with voice disorders obtained statistically significant higher scores for the Spanish VFI subscales.

Conclusion: the present study suggests that the Spanish translation of the Vocal Fatigue Index has a good internal consistency and high reliability on each of the three factors. The results suggest that the Spanish VFI can be used reliably to identify persons with vocal fatigue and has good clinical validity.


Download data is not yet available.

Citado por


Lady Catherine Cantor-Cutiva
María Celina Malebrán Bezerra de Mello
Eric J Hunter


Hunter E, Cantor-Cutiva LC, van Leer E, van Mersbergen M, Nanjundeswaran CD, Bottalico P, et al. Towards a consensus description of Vocal Effort, Vocal Load, Vocal Loading, and Vocal Fatigue. JSLHR. 26 Feb 2019;63(2):509-532. DOI:

Welham NV, Maclagan MA. Vocal fatigue: current knowledge and future directions. J Voice. 2003;17(1):21-30. DOI:

Cantor-Cutiva LC, Banks R, Berardi M, Johnson B, Clawson R, Martinez S, et al., editors. From Vocal Effort to Vocal Fatigue. What does the literature say? 11th International Conference on Voice Physiology and Biomechanics; 2018; Michigan State University, East Lansing, MI.

Sundberg J. Ciência da voz: fatos sobre a voz na fala e no canto: Editora da Universidade de São Paulo; 2015.

Casper JK, Leonard R. Understanding voice problems: A physiological perspective for diagnosis and treatment: Lippincott Williams & Wilkins; 2006.

Vilkman E. Voice problems at work: A challenge for occupational safety and health arrangement. Folia Phoniatr Logop. 2000 Ene-Jun;52(1-3):120-5. DOI:

Anand S, Bottalico P, Gray C. Vocal fatigue in prospective vocal professionals. J Voice. 14 Sep 2019; "en prensa". DOI:

Nanjundeswaran C, Jacobson BH, Gartner-Schmidt J, Abbott KV. Vocal Fatigue Index (VFI): development and validation. J Voice. 2015;29(4):433-40. DOI:

Gray CC. Relationship Between Vocal fatigue and physical/psychological factors in prospective vocal professionals [Tesis de Maestría]. Florida, USA, University of South Florida; 2018.

Banks RE, Bottalico P, Hunter EJ. The effect of classroom capacity on vocal fatigue as quantified by the vocal fatigue index. Folia Phoniatrica et Logopaedica. 2017;69(3):85-93.DOI:

Lohr KN. Assessing health status and quality-of-life instruments: attributes and review criteria. Quality of Life Research. 2002;11(3):193-205. DOI:

Athira UR, Devadas U. Adaptation and validation of Vocal Fatigue Index (VFI) to Malayalam language. J Voice. 1 Sep 2020;34(5):810-e19.

Naderifar E, Moradi N, Farzadi F, Tahmasebi N, Soltani M, Latifi SM, Nanjundeswaran C. Cross-cultural adaptation and validation of the vocal fatigue index into Persian. J Voice. 1 Nov 2019;33(6):947-e35.

Zambon F, Moreti F, Nanjundeswaran C, Behlau M. Cross-cultural adaptation of the brazilian version of the vocal fatigue index–VFI. CoDAS. 2017;29(2). In Press

Contreras-Regatero S, Vila-Rovira J, Verdejo C. Validity and reliability of spanish version of two questionnaires of vocal fatigue in female teachers. J Voice. 12 Ago 2019; "en prensa" DOI:

Cantor-Cutiva LC, Fajardo A, Burdorf A. Associations between self-perceived voice disorders in teachers, perceptual assessment by speech-language pathologists, and instrumental analysis. International journal of speech-language pathology. 2016;18(6):550-9.

Bland JM, Altman DG. Statistics notes: Cronbach's alpha. Bmj. 1997;314(7080):572.


Download data is not yet available.