Study of chain saw operators: nature of intermittent noise exposure and associated damage risk to hearing.
Study of intermittent noise effects on the hearing of chainsaw operators to describe the nature of intermittent high level noise conditions produced through routine use of this equipment, and to assess the potential hazard to hearing according to proposed limits for intermittent noise exposure and by evaluation of the post- exposure temporary threshold shifts (TTS) in the hearing of the workers. Application of the results of the noise survey results to proposed standards for intermittent noise exposure indicates that all sawyers are exposed to hazardous noise levels. Pre- and post- exposure audiometric test results demonstrate that the resultant temporary TTS produces some small risk to hearing for sawyers exposed to the highest noise levels but not for the others. However, the TTS exhibited at the close of the workday that had disappeared by the following morning underscore the minimal risk to hearing involved in the work operations.
Audiometric-testing; Auditory-threshold; Noise-control; Sound-levels; Hearing-impairment; Acoustic-environment
National Institute for Occupational Safety and Health, Public Health Service, U.S. Department of Health, Education, and Welfare, Cincinnati, Ohio, 10 pages, 4 references