1997 Volume 40 Issue 4 Pages 223-230
In order to investigate the effect of impulsive sounds from clay pigeon trapshooting on trapshooters, we measured the impulsive sounds using dummy head manequin equipment (KEMAR). We also carried out pure tone audiometry and questionnaire in 63 sport clay pigeon trapshooters
The results were as follows. 1) A peak sound pressure level of the clay pigeon trapshooting was about 155dB 2msec after the blast and the peak frequency was around 2500Hz. 2) There were considrable difference in peak sound pressure level between the two cars, on the muzzle side, and the other side. 3) Three kinds of hearing protection devices (HPDs) were tested. The earplug was more effective in attenuating peak levels of shooting impulses than both the earmuff and the earbulb. 4) As a result of pure tone audiometry, 39 subjects showed noise induced hearing loss (NIHL) in high frequency and 24 individuals exhibited normal hearing. Comparing the results of questionnaire between the groups, in the group with NIHL, mean age and mean experience period were higher than the remainders. HPDs were not so frequently used, but HPDs were effective in protecting the trapshooter's hearing when used properly. Educations on the need and appropriate use of HPDs are recommended.
