Folia Phoniatr Logop 2004;56:220–253
(DOI:10.1159/000078344)

Occupational Safety and Health Aspects of Voice and Speech Professions

Vilkman E.

Author affiliations

Phoniatric Department, University of Oulu, Oulu, and Helsinki University Hospital, Helsinki, Finland

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Article / Publication Details

First-Page Preview
Abstract of Paper

Received: February 17, 2004
Published online: July 05, 2004

Number of Print Pages: 34
Number of Figures: 9
Number of Tables: 4

ISSN: 1021-7762 (Print)
eISSN: 1421-9972 (Online)

For additional information: https://www.karger.com/FPL

Abstract

A well-functioning voice is an essential tool for one third of the labour force. Vocal demands vary to a great extent between the different voice and speech professions. In professions with heavy vocal loading (e.g. school and kindergarten teachers), occupational voice disorders threatening working ability are common. Vocal loading is a combination of prolonged voice use and additional loading factors (e.g. background noise, acoustics, air quality) affecting the fundamental frequency, type and loudness of phonation or the vibratory characteristics of the vocal folds as well as the external frame of the larynx. The prevention and treatment of occupational voice disorders calls for improved occupational safety and health (OSH) arrangements for voice and speech professionals. On the basis of epidemiological and acoustic-physiological research, the presence of risk to vocal health can be substantiated. From the point of view of the physical load on the vocal apparatus, loading-related physiological changes (adaptation) may play a role in the occupational risk. Environmental factors affect vocal loading changes. In teaching professions, the working environment is shared with children, who benefit from amendments of OSH legislation concerning their teachers.

© 2004 S. Karger AG, Basel


References

  1. Rose VE: History and philosophy of industrial hygiene; in DiNardi SR (ed): The Occupational Environment – Its Evaluation and Control. Fairfax, AIHA Press, 1997, pp 3–20.
  2. Konkolewsky L: Priorities and Strategies in Occupational Safety and Health Policy in Member States of the European Union. Bilbao, European Agency for Safety and Health at Work, 1997.
  3. Council Directive: On the Introduction of Measures to Encourage Improvements in the Safety and Health of Workers at Work. 89/391/EEC. Brussels, 1989.
  4. Oborne DJ: Ergonomics at Work, ed 2. Liverpool, Wiley & Sons, 1987.
  5. Vilkman E: Occupational risk factors and voice disorders. Logoped Phoniatr Vocol 1996;21:137–141.
  6. Sonninen A: Ontology and communication in speech and voice therapy; in Kjaer BE (ed): Proc 3rd Scand Conf Logoped and Phoniatr. Copenhagen, Audiologopaedisk forening, 1994, pp 14–25.
  7. Sherman D, Jensen R: Harshness and oral reading time. J Speech Hear Res 1962;27:172–177.
  8. Vintturi J: Studies on Voice Production with Special Emphasis on Vocal Loading, Gender, Some Exposure Factors and Intensity Regulation. Helsinki, 2001. http://ethesis.helsinki.fi
  9. Scott S, Robinson K, Wilson JA, MacKenzie K: Patient-reported problems associated with dysphonia. Clin Otolaryngol 1997;22:37–40.
    External Resources
  10. Öberg T, Sandsjö L, Kadefors R: Subjective and objective evaluation of shoulder muscle fatigue. Ergonomics 1994;37:1323–1333.
    External Resources
  11. Kroemer KH, Grandjean E: Fitting the Task to the Human, ed 5. London, Taylor & Francis, 1997.
  12. Lira EA, Bonilla R, Castro L, Figari A, Maraboli E, Munon O, Pinto E, Salinas S, Schwalm E, Vera S: Un estudio experimental sorbe los efectos del abuso vocal en seis voluntarios; in Segre E (ed): Proc 15th Conf IALP. Buenos Aires, 1971, pp 549–588.
  13. Vilkman E, Sonninen A, Hurme P, Körkkö P: External frame function revisited: A review. J Voice 1996;10:78–92.
    External Resources
  14. Kelso JAS, Tuller B: Converging evidence in support of common dynamical principles for speech and movement coordination. Am J Physiol 1984;246:R928–R935.
  15. Lauri E-R, Alku P, Vilkman E, Sala E, Sihvo M: Effects of prolonged oral reading on time-based glottal flow waveform parameters with special reference to gender differences. Folia Phoniatr Logop 1997;49:234–246.
    External Resources
  16. Sihvo M, Vilkman E, Lauri E-R, Alku P, Sala E: Phonation in the low pitch range as an indicator of vocal loading. Logoped Phoniatr Vocol 1999;24:84–91.
    External Resources
  17. Vilkman E, Lauri E-R, Alku P, Sala E, Sihvo M: Loading changes in time-based parameters of glottal flow waveforms in different ergonomic conditions. Folia Phoniatr Logop 1997;49:234–246.
    External Resources
  18. Vilkman E, Lauri E-R, Alku P, Sihvo M, Sala E: Ergonomic conditions and voice. Logoped Phoniatr Vocol 1998;23:11–20.
    External Resources
  19. Vilkman E, Lauri E-R, Alku P, Sala E, Sihvo M: Effects of prolonged oral reading on F0, SPL, subglottal pressure and amplitude characteristics of glottal flow waveforms. J Voice 1999;13:303–315.
    External Resources
  20. Vintturi J, Alku P, Lauri E-R, Sala E, Sihvo M, Vilkman E: The effects of post-loading rest on acoustic parameters with special reference to gender and ergonomic factors. Folia Phoniatr Logop 2001;53:338–350.
    External Resources
  21. Vintturi J, Alku P, Lauri E-R, Sala E, Sihvo M, Vilkman E: Objective analysis of vocal warm-up with special reference to ergonomic factors. J Voice 2001;15:36–53.
    External Resources
  22. Vintturi J, Alku P, Sala E, Sihvo M, Vilkman E: Loading-related subjective symptoms during a vocal loading test with special reference to gender and some ergonomic factors. Folia Phoniatr Logop 2003;55:55–69.
  23. Alku P: Glottal wave analysis with pitch synchronous iterative adaptive inverse filtering. Speech Commun 1992;11:109–118.
    External Resources
  24. Alku P, Vilkman E, Pekkarinen E: PAAPP A: A flexible computer environment for the analysis of the voice source. Scand J Logoped Phoniatr 1993;18:51–56.
  25. Alku P, Vilkman E: Amplitude domain quotient for characterization of the inverse filtered glottal flow. Speech Commun 1996;18:131–138.
    External Resources
  26. Alku P, Vilkman E: A comparison of glottal voice source quantification parameters in breathy, normal and pressed phonation of female and male speakers. Folia Phoniatr Logop 1996;48:240–254.
    External Resources
  27. Motel T, Fisher KV, Leydon C: Vocal warm-up increases phonation threshold pressure in soprano singers at high pitch. J Voice 2003;17:160–167.
    External Resources
  28. Verdolini-Marston K, Titze R, Druker DG: Changes in phonation threshold pressure with induced conditions of hydration. J Voice 1990;4:142–151.
  29. Verdolini K, Min Y, Titze IR, Lemke J, Brown K, van Mersbergen M, Jiang J, Fisher K: Biological mechanisms underlying voice changes due to dehydration. J Speech Lang Hear Res 2002;45:268–281.
    External Resources
  30. Rantala L: Voice at Work (in Finnish); doct diss University of Oulu, Oulu, 2000.
  31. Rantala L, Haataja K, Vilkman E: Practical arrangements of a field examination of teachers’ voice use. Scand J Logoped Phoniatr 1994;19:43–54.
  32. Rantala L, Paavola L, Körkkö P, Vilkman E: Working-day effects on the spectral characteristics of teaching voice. Folia Phoniatr Logoped 1998;50:205–211.
  33. Rantala L, Määttä T, Vilkman E: Measuring voice under teacher’s working circumstances: F0 and perturbation features in maximally sustained phonation. Folia Phoniatr Logoped 1997;49:281–291.
  34. Rantala L, Vilkman E: Relationship between subjective voice complaints and acoustic parameters in teacher’s voice. J Voice 1999;13:484–495.
    External Resources
  35. Rantala L, Vilkman E, Bloigu R: Voice changes during work: Subjective complaints and objective measurements for female primary and secondary schoolteachers. J Voice 2002;16:344–355.
    External Resources
  36. Jonsdottir V, Rantala L, Laukkanen A-M, Vilkman E: Effects of sound amplification on teachers’ speech while teaching. Logoped Phoniatr Vocol 2001;26:118–123.
    External Resources
  37. Vilkman E, Lehto L, Bäckström T, Alku P: Vocal Loading of Call Centre Personnel; in Schade G, Müller F, Wittenberg T, Hess M: AQL 2003 Hamburg: Proc Papers for the Conf Adv in Quant Laryngol, Voice and Speech Res (CD ROM, http://www.uke.uni-hamburg.de/AQL2003). Stuttgart, IRB Verlag, 2003.
  38. Sala E, Airo E, Olkinuora P, Simberg S, Ström U, Laine A, Pentti J, Suonpää J: Vocal loading among day care center teachers. Logoped Phoniatr Vocol 2002;27:21–28.
    External Resources
  39. Södersten M, Granqvist S, Hammarberg B, Szabo A: Vocal behavior and vocal loading factors for preschool teachers at work studied with binaural DAT recordings. J Voice 2002;16:356–371.
    External Resources
  40. Kitzing P: Glottographic F0 Analysis (in Swedish); doct diss University of Lund, Lund, 1977.
  41. Masuda T, Ikeda Y, Manako H, Komiyama S: Analysis of vocal abuse: Fluctuations in phonation time and intensity in 4 groups of speakers. Acta Otolaryngol (Stockh) 1993;113:547–552.
    External Resources
  42. Jonsdottir V, Boyle BE, Martin P, Sigurdardottir G: A comparison of the occurrence and nature of vocal symptoms in two groups of Icelandic teachers. Logoped Phoniatr Vocol 2002;27:98–105.
    External Resources
  43. Cudd PA, Whiteside SP, Stoneham H, Syder D, de Bruijn C: Using dictation systems: A contributory cause of dysphonia; in Krom G (ed): Proc Voicedata 98. Utrecht, University of Utrecht, 1998, pp 98–103.
  44. Vilkman E, Manninen O: Changes in prosodic features of speech due to environmental factors. Speech Commun 1986;5:331–345.
    External Resources
  45. Artkoski M, Tommila J, Laukkanen A-M: Changes in voice during a day in normal voices without vocal loading. Logoped Phoniatr Vocol 2002;27:118–123.
    External Resources
  46. Jones K, Sigmon J, Hock L, Nelson E, Sullivan M, Ogren F: Prevalence and risk factors for voice problems among telemarketers. Arch Otolaryngol Head Neck Surg 2002;128:571–577.
    External Resources
  47. Bäckström T, Lehto L, Alku P, Vilkman E: Automatic presegmentation of running speech improves the robustness of several acoustic voice measures. Logoped Phoniatr Vocol 2003;28:101–108.
    External Resources
  48. Lehto L, Rantala L, Vilkman E, Alku P, Bäckström T: Experiences of a short vocal training course for call-centre customer service advisors. Folia Phoniatr Logop 2003;55:163–176.
  49. Lehto L, Alku P, Bäckström T, Vilkman E: A study on voice symptoms of call-centre customer service advisors. Submitted.
  50. ISO: Ergonomic Assessment of Speech Communication. Part I. ISO 9921-1, 1996.
  51. Vilkman E: A survey on the occupational safety and health arrangements for voice and speech professionals; in Dejonckere P (ed): Occupational Voice – Care and Cure. The Hague, Kugler, 2001, pp 129–137.
  52. Szeszeni-Dabrowskiej, Szymczak W, Wilczynska, Peplonska B: Analiza struktury i zapadalnosci na choroby zawodowe pracownikow gospodarki naro IMP w Lodzi. Lodz, Centralny Rejestr Chorob Zawodych, 2003.
  53. Laukkanen A-M: On Speaking Voice Exercises; PhD thesis University of Tampere, Tampere, 1995.
  54. Titze IR, Lemke J, Montequin D: Populations in the U.S. workforce who rely on voice as a primary tool of trade. NCVS Status Progr Rep 1996;10:127–132.
  55. Pekkarinen E, Himberg L, Pentti J: Prevalence of vocal symptoms among teachers compared with nurses: A questionnaire study. Scand J Logoped Phoniatr 1992;17:113–117.
  56. Smith E, Gray SD, Dove H, Kirchner L, Heras H: Frequency and effects of teachers’ voice problems. J Voice 1997;11:81–87.
    External Resources
  57. Morton V, Watson DR: The teaching voice: Problems and perceptions. Logoped Phoniatr Vocol 1998;23:133–139.
    External Resources
  58. Gotaas C, Starr CD: Vocal fatigue among teachers. Folia Phoniatr 1993;45:120–129.
    External Resources
  59. Sapir S, Keidar A, Mathers-Schmidt B: Vocal attrition in teachers: Survey findings. Eur J Disord Commun 1993;28:177–185.
    External Resources
  60. Russell A, Oates J, Greenwood KM: Prevalence of voice problems in teachers. J Voice 1998;12:467–479.
    External Resources
  61. Klingholz F, Siegert C, Schleier E, Thamm R: Lärmbedingte Stimmstörungen bei Angehörigen unterschiedlicher Berufsgruppen. HNO-Praxis 1978;3:193–201.
  62. De Jong FICRS, Cornelis BE, Wuyts FL, Kooijman PGC, Schutte HK, Oudes MJ, Graamans K: A psychological cascade model for persisting voice problems in teachers. Folia Phoniatr Logop 2003;55:91–101.
  63. DeBodt MS, Wuyts FL, ven de Heyning S, Lambrechts L, van den Abecle D: Predicting vocal outcome by means of a vocal endurance test: A 5-year follow-up study in female teachers. Laryngoscope 1998;108:1363–1367.
    External Resources
  64. Ohlsson A-C: Voice and Work Environment; PhD thesis University of Gothenberg, Gothenberg, 1988.
  65. Buekers R: Voice Performances in Relation to Demands and Capacity: Development of a Quantitative Phonometric Study of the Speaking Voice; doct diss University of Maastricht, Maastricht, 1998.
  66. Buekers R, Bierens E, Kingma H, Marres EHMA: Vocal load as measured by the voice accumulator. Folia Phoniatr Logop 1995;47:252–261.
    External Resources
  67. Ramig L, Verdolini K: Treatment efficacy: Voice disorders. J Speech Lang Hear Res 1998;41:101–116.
    External Resources
  68. Balter MS: Adams SG, Chapman KR: Inhaled beclomethasone dipropionate improved acoustic measures of voice in patients with asthma. Chest 2001;120:1829–1834.
    External Resources
  69. Ma E, Yiu E: Voice activity and participation profile: Assessing the impact of voice disorders on daily activities. J Speech Lang Hear Res 2001;44:511–524.
    External Resources
  70. MacKenzie K, Millar A, Wilson JA, Sellars C, Deary IJ: Is voice therapy an effective treatment for dysphonia? A randomized controlled trial. BMJ 2001;323:658–661.
    External Resources
  71. World Health Organisation: International Classification of Impairments, Disabilities and Handicaps (ICIDH-2). Geneva, WHO, 2001.
  72. Scott S, Robinson K, Wilson JA, MacKenzie K: Patient-reported problems associated with dysphonia. Clin Otolaryngol 1997;22:37–40.
    External Resources
  73. Kenyon EL: Significance of the extrinsic musculature of the larynx. JAMA 1922;79:428–431.
  74. Heidelbach J-G: Über die Epidemiologie von Stimm-, Sprech- und Sprachstörungen. HNO-Praxis 1986;11:301–304.
  75. Fritzell B: Voice disorders and occupations. Logoped Phoniatr Vocol 1996;21:7–12.
    External Resources
  76. British Standard: Guide to Occupational Health and Safety Management Systems. BS 8800, 1996.
  77. ILO: Guidelines on Occupational Safety and Health Management Systems, ILO-OSH 2001. Geneva, International Labour Office, 2001.
  78. Wilson JA, Deary IJ, Scott S, MacKenzie K: Functional dysphonia: Not ‘hysterical’ but still seen mainly in women. BMJ 1995;311:1039–1040.
    External Resources
  79. Punnett L: Commonly asked questions about musculoskeletal disorders and gender; in Levy BS, Wegman DH (eds): Occupational Health, ed 4. Philadelphia, Lippincott, Williams & Wilkins, 2000, pp 659–662.
  80. von Onciul J: Stress at work. BMJ 1996;313:745–748.
    External Resources
  81. Kalimo R, Lindström K, Smith MJ: Psychosocial approach in occupational health; in Salvendy G (ed): Handbook of Human Factors and Ergonomics, ed 2. New York, Wiley & Sons, 1997.
  82. Sanne B, Mykletun A, Dahl AA, Moen BE, Tell GS: Occupational differences in levels of anxiety and depression: The Hordeland Health Study. J Occup Environ Med 2003;45:628–638.
    External Resources
  83. Westman M, Etzion D: The crossover of strain from school principals to teachers and vice versa. J Occup Health Psychol 1999;4:269–278.
    External Resources
  84. Gray SD, Thibeault S: Diversity in voice characteristics – interaction between genes and environment, use of microarray analysis. J Commun Disord 2002;35:347–354.
    External Resources
  85. Gauffin J, Sundberg J: Spectral correlates of glottal voice source waveform characteristics. J Speech Hear Res 1989;32:556–565.
    External Resources
  86. Titze IR: Vocal efficiency. J Voice 1992;6:135–138.
  87. Pettersen V, Westgaard RH: Muscle activity in the classical singer’s shoulder and neck region. Logoped Phoniatr Vocol 2002;27:169–178.
    External Resources
  88. Seidner W, Wendler J: Phoniatric fitness examinations: Evaluation of long-term experiences; in Dejonckere PH: Occupational Voice – Care and Cure. The Hague, Kugler, 2001, pp 47–52.
  89. Vilkman E, Alku P, Vintturi J: Dynamic extremes of voice in the light of time domain parameters extracted from the amplitude features of glottal flow and its derivative. Folia Phoniatr Logop 2002;54:144–157.
  90. Gray S: Basement membrane zone injury in vocal nodules; in Gauffin J, Hammarberg B (eds): Vocal Fold Physiology. San Diego, Singular, 1991, pp 21–28.
  91. Rantala L, Lindholm P, Vilkman E: F0 change due to voice loading under laboratory and field conditions. Logoped Phoniatr Vocol 1998;23:164–168.
    External Resources
  92. Sala E, Laine A, Simberg S, Pentti J, Suonpää J: The prevalence of voice disorders among day care center teachers compared with nurses: A questionnaire and clinical study. J Voice 2001;15:413–423.
    External Resources
  93. Ward PD, Thibeault SL, Gray SD: Hyaluronic acid: Its role in voice. J Voice 2002;16:303–309.
    External Resources
  94. Sederholm E, McAllister A, Dalkvist J, Sundberg J: Aetiologic factors associated with hoarseness in ten-year-old children. Folia Phoniatr Logop 1995;47:262–278.
    External Resources
  95. Truchon-Gagnon C, Hetu R: Noise in day-care centers for children. J Noise Control Eng 1988;30:57–64.
  96. Pekkarinen E, Viljanen V: Acoustic conditions for speech communication in classrooms. Scand Audiol 1991;20:257–263.
    External Resources
  97. Bruce RD, Bommer AS, Moritz CT: Noise, vibration and ultrasound; in DiNardi SR (ed): The Occupational Environment – Its Evaluation and Control. Fairfax, AIHA Press, 1997, pp 424–489.
  98. Alku P, Bäckström T, Vilkman E: Normalized amplitude quotient for parameterization of the glottal flow. J Acoust Soc Am 2002;112:701–710.
    External Resources
  99. Yiu EM-L, Chan RMM: Effect of hydration and vocal rest on the vocal fatigue in amateur karaoke singers. J Voice 2003;17:216–227.
    External Resources
  100. van den Berg JW: Modern research in experimental phoniatrics. Folia Phoniatr 1962;14:81–149.
    External Resources
  101. Finkelhor BK, Titze IR, Durham PL: The effect of viscosity changes in the vocal folds on the range of oscillation. J Voice 1988;1:320–325.
  102. Hemler RJB, Wieneke GH, Lebacq J, Dejonckere PH: Laryngeal mucosa elasticity and viscosity in high and low relative humidity. Eur Arch Otorhinolaryngol 2001;258:125–129.
    External Resources
  103. Richter B, Löhle E, Maier W, Kliemann B, Verdolini K: Working conditions on stage: Climatic considerations. Logoped Phoniatr Vocol 2000;25:80–86.
    External Resources
  104. Richter B, Löhle E, Knapp B, Weikert M, Schlömicher-Thier J, Verdolini K: Harmful substances on the opera stage: Possible negative effects on singer’s respiratory tracts. J Voice 2002;16:72–80.
    External Resources
  105. Jonsdottir V, Laukkanen A-M, Vilkman E: Changes in teachers’ speech during a working day with and without electric sound amplification. Folia Phoniatr Logop 2002;54:282–287.
  106. Jonsdottir VI: The Voice: An Occupational Tool; doct diss University of Tampere, Tampere, 2003. http://acta.uta.fi
  107. Szabo A, Hammarberg B, Granqvist S, Södersten M: Methods to study the pre-school teacher’s voice at work: Simultaneous recordings with a voice accumulator and a DAT recorder. Logoped Phoniatr Vocol 2003;28:29–39.
    External Resources
  108. Airo E, Olkinuora P, Sala E: A method to measure speaking time and speech sound pressure level. Folia Phoniatr Logop 2000;52:275–288.
    External Resources
  109. Svec JG, Popolo PS, Titze IR: Measurement of vocal doses in speech: Experimental procedure and signal processing. Logoped Phoniatr Vocol 2003;28:181–192.
    External Resources
  110. Svec JG, Titze IR, Popolo PS: Vocal dosimetry: Theoretical and practical issues; in Schade G, Müller F, Wittenberg T, Hess M (eds): AQL 2003 Hamburg: Proc Papers for the Conf Adv in Quant Laryngol, Voice and Speech Res (CD ROM, http://www.uke.uni-hamburg.de/AQL2003). Stuttgart, IRB Verlag, 2003.
  111. Hillman R, Cheyne H: A portable vocal accumulator with biofeedback capability; in Schade G, Müller F, Wittenberg T, Hess M (eds): AQL 2003 Hamburg: Proc Papers for the Conf Adv in Quant Laryngol, Voice and Speech Res (CD ROM, http://www.uke.uni-hamburg.de/AQL2003). Stuttgart, IRB Verlag, 2003.
  112. Neils LR, Yairi E: Effects of speaking in noise on vocal fatigue and vocal recovery. Folia Phoniatr 1987;39:104–112.
    External Resources
  113. Cullen MR, Kreiss K: Indoor air quality and associated disorders; in Levy BS, Wegman DH (eds): Occupational Health, ed 4. Philadelphia, Lippincott, Williams & Wilkins, 2000, pp 447–458.
  114. Baker DB, Karasek RA: Stress; in Levy BS, Wegman DH (eds): Occupational Health, ed 4. Philadelphia, Lippincott, Williams & Wilkins, 2000, pp 419–436.
  115. Anonymous: Occupational voice loss is now an official work disease. Hazards 1996;56:2.
  116. Dalton S, Hazleman BL: Repeated movements and repeated trauma; in Raffle PAB, Lee WR, McCallum RI, Murrays R (eds): Hunter’s Diseases of Occupation. London, Hodder & Stoughton, 1987, pp 620–633.
  117. Descatha A, Leclerc A, Chastang JF, Roquelaure Y: Medial epicondylitis in occupational settings: Prevalence, incidence and associated risk factors. J Occup Environ Med 2003;45:993–1001.
    External Resources
  118. Gagnon M, Delisle A, Desjardins P: Biomechanical differences between best and worst performances in repeated free asymmetrical lifts. Int J Ind Ergon 2002;29:73–83.
    External Resources
  119. Hack A: Wirbelsäulenschonendes Heben. Teil 2. Manuelle Med 2002;40:279–281.
  120. Sala E, Viljanen V: Improvement of acoustic conditions for speech communication in classrooms. Appl Acoust 1995;45:81–91.
  121. Phyland DJ, Oates J, Greenwood KM: Self-reported voice problems among three groups of professional singers. J Voice 1999;13:602–611.
    External Resources
  122. McGlashan J, Howard D: Theoretical and practical considerations in the occupational use of voice amplification devices; in Dejonckere P (ed): Occupational Voice – Care and Cure. The Hague, Kugler, 2001, pp 165–186.
  123. Roy N, Weinrich B, Gray SD, Tanner K, Toledo SW, Dove H, Corbin-Lewis K, Stemple JC: Voice amplification versus vocal hygiene instruction for teachers with voice disorders: A treatment outcomes study. J Speech Lang Hear Res 2002;45:625–638.
    External Resources
  124. Samways MC: Worker education and training; in DiNardi (ed): The Occupational Environment – Its Evaluation and Control. Fairfax, AIHA Press, 1997, pp 806–826.
  125. ASHA: Position statement and guidelines for acoustics in educational settings. ASHA 1995;37:15–19.
  126. Howard D, Angus AS: Room acoustics: How they affect vocal production and perception; in Dejonckere PH: Occupational Voice – Care and Cure. The Hague, Kugler, 2001, pp 29–46.
  127. Tanaka H, Nishio N, Murakami E, Mukai M, Kinoshita N, Mori I: Mortality and causes of death among Japanese School Personnel between 1992 and 1996. J Occup Health 2001;43:129–135.
  128. Jacobson BH, Johnson A, Grywalski C, Silbergleit A, Jacobson G, Benninger MS, Newman CW: The voice handicap index (VHI): Development and validation. Am J Speech Lang Pathol 1997;6:66–70.
  129. European Committee for Standardization: Safety of Machinery – Ergonomic Design Principles. Part 1:Terminology and General Principles. EN 614-1/1995.

Article / Publication Details

First-Page Preview
Abstract of Paper

Received: February 17, 2004
Published online: July 05, 2004

Number of Print Pages: 34
Number of Figures: 9
Number of Tables: 4

ISSN: 1021-7762 (Print)
eISSN: 1421-9972 (Online)

For additional information: https://www.karger.com/FPL


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