Measurement of sound pressure in external auditory meatus during listening to music in noisy environments

在本研究中，测量了在各种噪声环境中使用便携式音乐播放器听音乐的受试者的外耳道（EAM）中的声压，并调查了在噪声环境中听音乐导致听力损失的风险。在EAM中的声压进行了测量，在七个科目的声亭系统，能够再现在火车上的嘈杂环境。当受试者在安静环境中听音乐时，虽然声压级约为85 dB，但在某些受试者中，EAM中的声压级达到90 - 100 dB。这一结果强烈表明听力损失的风险。这种方法可以在恒定的环境下进行测量，并客观地评估音乐设备、音乐源和噪声的个体差异和差异。为了在小鼠中进行类似的实验，开发了用于小鼠噪声暴露实验的系统。下一步，将通过使用该系统测量EAM中的声压来研究对内耳的影响。

In this study, sound pressure in the external auditory meatus (EAM) of subjects who are listening to music on a portable music player was measured in various noisy environments, and the risk of hearing loss due to listen to music in noisy environment was investigated. Sound pressure in the EAM was measured in seven subjects in a sound booth system which was able to reproduce the noisy environments in a train. The sound pressure level in the EAM reached to 90 - 100 dB in some subject although the sound pressure level was approximately 85 dB when they were listen to music in silent environment. This result strongly suggests the risk of hearing loss. This method makes it possible to conduct measurements under constant environment and to objectively evaluate individual differences and differences in music devices, music sources, and noises. To conduct similar experiments in mice, a system for noise exposure experiments for mice was developed. For the next step, the effects on the inner ear will be investigated by measuring the sound pressure in the EAM using the system.