A study of classroom acoustics and school teachers' noise exposure, voice load and speaking time during teaching, and the effects on vocal and mental fatigue development

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Objectives The study investigated the noise exposure in a group of Danish school teachers. The aims were to investigate if noise posed a risk of impairment of hearing and to study the association between classroom acoustical conditions, noise exposure, vocal symptoms, and cognitive fatigue. Methods Background noise levels, vocal load and speaking time were measured on 35 teachers during actual classroom teaching. The classrooms were characterized acoustically by measurements of reverberation time. Before and after the workday, the teachers answered a questionnaire on fatigue symptoms and carried out two cognitive test tasks sensitive to mental fatigue. Results The average noise level during the lessons was 72 dB(A), but during indoor sports activities the average noise level increased 6.6 dB(A). Room reverberation time (range 0.39-0.83 s) had no significant effect on the noise level. The teachers were talking with a raised voice in 61 % of the time, and the vocal load increased 0.65 dB(A) per dB(A) increase in the average lesson noise level. An increase in voice symptoms during the workday correlated significantly with individual average noise exposure, and a decrease in performance in the two-back test correlated significantly with individual average vocal load. Conclusions Noise exposure in general classrooms posed no risk of noise-induced hearing impairment in school teachers. However, the results provide evidence for an association between noise exposure and vocal load and development of vocal symptoms and cognitive fatigue after work.

Detaljer

Författare
  • Jesper Kristiansen
  • Soren Peter Lund
  • Roger Persson
  • Hitomi Shibuya
  • Per Moberg Nielsen
  • Matthias Scholz
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Miljömedicin och yrkesmedicin

Nyckelord

Originalspråkengelska
Sidor (från-till)851-860
TidskriftInternational Archives of Occupational and Environmental Health
Volym87
Utgivningsnummer8
StatusPublished - 2014
PublikationskategoriForskning
Peer review utfördJa