Effects of the level of noise interruptions on temporary threshold shift.
Schmidek-M; Margolis-B; Henderson-TL
Investigation of the effects of intermittent noise exposures on the hearing of males subjected to a spectrum of noise levels. When a 45 minute exposure to 103 decibels (dB) broad band noise is interrupted, the level of noise at 57 decibels has a significant effect resulting in less temporary threshold shift and a more rapid 30 minute recovery rate as compared with exposures interrupted by levels of 67 decibels and 77 decibels. The results suggest that levels of interruption below 80 decibels could be another variable to be considered in understanding the effects of intermittent noise exposures on hearing. It is hypothesized that the subjects exposed to 67 and 77 decibels exhibit complete adaptation of the acoustic reflex while those exposed to 57 decibels are able to retard the adaptation reflex.
Audiometric-testing; Auditory-threshold; Sound-levels; Noise-control; Hearing-impairment
National Institute for Occupational Safety and Health, Public Health Service, U.S. Department of Health, Education, and Welfare, Cincinnati, Ohio, 8 pages,16 references