Physiological Costs and Hearing Risks Associated with Chinese Classical Music and Energy-Equivalent Sound Ezposures with Differing Frequency Composition
Three test noises and a music exposure were configured that were completely comparable in the sense that they all had a mean level of 94 dB (A) for 1 h, but differed in their frequency composition. An original industrial noise exposure and two altered exposures were used whereby the band levels were increased in the lower and in the higher frequency range of the original industrial noise, respectively, with compensating attenuation in the other frequency ranges. In a fourth test series, an energy-equivalent exposure of Classical Chinese music was provided which exhibited a completely different frequency composition and time structure. Ten otologically normal chinese test subjects (Ss) participated in the 4 test series which followed a change-over test design on 4 days. The maximum threshold shift TTS2 and the time needed for a complete recovery of the hearing, associated with the accented high-frequency noise were substantially higher and lasted longer than with the unaltered original industrial noise. The accented low-frequency noise also resulted in substantially higher threshold shifts that persisted for a longer time than those of the unaltered noise exposure. As a result, the Integrated Restitution Temporary Threshold Shifts (IRTTS), known as measure for the “Physiological Costs in their entirety that the hearing must “pay for the preceding noise exposures, differed very distinctly. The physiological responses to the test series with the music exposure were strikingly weaker. When the IRTTS-values of the test series with the altered spectra and the music exposure are expressed relative to the value for the original industrial noise, the quotients of 5.26 and 1.99 indicate 5 times and 2 times higher physiological responses and hearing risks associated with accented highfrequency and low-frequency components in energetically identical noise exposures. The quotient of just 0.57 for the music exposure represents, by far, lowest physiological responses. Compared to industrial noise, the extremely low short-term physiological costs of the music exposure as well as the long-term risk to the hearing are absolutely overestimated when meanwhile conventional measures of rating noise were also applied to music exposures.
Noise Music Ezposures Physiological Costs Hearing Risk
Helmut Strasser Mao-Jiun Wang Min-Chi Chiu Oliver Müller
Ergonomics Division, University of Siegen, Paul-Bonatz-Str. 9-11, D-57068 Siegen/Germany National Tsing Hua University, Hsinchu/Taiwan Chung-Shang Medical University, Taichung/Taiwan
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-9
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）