ロックコンサートの聴覚学的検討:1986年に行われたロックコンサートより

概要

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18 young adults were divided into 3 groups of 6 subjects each and investigated as to their hearing level before and after exposure to loud sounds at a rock concert. The first group sat in a near front row, the second group sat in a middle front row and the third group sat in a middle row. A threshold shift in 4KHz was great and it ranged 60 dB at the maximum, while threshold shifts in 8 KHz and 1 KHz were rather moderate and ranged within 25 dB at the maximum. A threshold shift more than 10 dB in 4 KHz was observed in 35 out of 36 ears at the time of just after exposure to loud sounds, and in 18 out of 26 ears two hours after exposure. The shift was still observed in 6 ears the next day, but all recovered second day after the concert. The threshold shift in 8 KHz and 1 KHz was within the level of 15 dB 1 hour after exposure to loud sounds. For the second part of the investigation, the music was recorded 23 meters from bilateral speakers and sound level and octave band analysis was performed. Sound level was 95-110 dB (A). In octave band analysis, high energy was observed in middle frequencies, and Leq was 102 dB. Three dimensional display showed a chronologically same pattern in each octave band. Leq values at 14 different places of concert hall were all in high levels of more than 102 dB.
耳鼻と臨床会の論文