Hearing loss from gun and railroad noise - relations with ISO Standard 1999.
J Acoust Soc Am 1991 Dec; 90(6):3180-3195
The separate and joint effects of gun noises and ear disease on hearing threshold sensitivity were investigated in 9778 railroad workers. Hearing related data were collected from the trainmen through questionnaires and hearing levels were estimated using automated fixed frequency audiometers. Small but significant losses in hearing sensitivity were noted at frequencies above 2000 hertz (Hz) for trainmen over the age of 45 who had not been screened for ear disease or exposed to gun noise. Hearing losses from the railroad noise in trainmen who had used guns were largely indistinguishable from losses due to gun noise and vice versa. For nongun users, hearing levels adjusted for estimated losses from disease revealed poorer hearing sensitivity than that found in otologically normal males of like age unexposed to gun or intense workplace noise. Those trainmen who had been in the military service or used guns for hunting and target shooting had about 2 to 5 decibels (dB) more hearing loss at frequencies above 2000Hz than trainmen who had not used guns. Workplace exposure levels were 92, 87, and 39dB-A for railroads, military gun noise, and hunting and/or target gun noise, respectively. Right and left ear differences in mean hearing levels of trainmen occurred as readily from exposure to railroad workplace noise as to gun noise. Use of ear protection by trainmen did not decrease the amount of hearing loss from railroad noise.
NIOSH-Publication; NIOSH-Grant; Noise-induced-hearing-loss; Noise-exposure; Industrial-noise; Sensory-thresholds; Occupational-exposure; Ear-protection; Military-personnel; Railroad-industry
Communicative Disorders San Diego State University 5300 Campanile DR San Diego, CA 92182
Journal of the Acoustical Society of America
San Diego State University, San Diego, California