変動騒音による一過性聴力損失と回復について

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The authors investigated effects of fluctuating noise on hearing. Seven persons were experimentally exposed to a steady state noise (S) of 98 phon for 60 minutes, a fluctuating noise (A) of 101 phon with standard deviation of 8.8 phon for 40 minutes and (B) of 99 phon with s.d. of 7.0 phon for 60 minutes. The fluctuating noises were composed of air exhaust noises.All values were measured using JIS method. The TTS was measured five times, in time series of exposure and showed in dB value.Regression analysis applied to the data obtained revealed statistically significant linearity between the increase of TTS and the exposed duration in minutes in common logarithm, with all three kinds of noise as follows;YS=9.69log10X+6.29 YS, YA, YB......TTS in dB with noise S, A andYA=32.12log10X-16.14 B respectivelyYB=19.17log10X-5.24 X......exposed duration in minutesThe difference among the three regression coefficients was significant at 5% level with each other. These results indicate that TTS increases linearly parallel with exposed duration in minutes in common logarithm and that the greater TTS with noise A than that with noise B and similarly the greater TTS with B than that with S are observed. Since the three means of OBL on frequency analysis with the three noises around the center frequency of 3kc were nearly the same value, the present study may indicate that the TTS due to a fluctuating noise is greater than that due to a steady state noise and that the TTS may be modified by the characteristics of the fluctuating noise.As to the TTS recovery term, longer duration was observed in cases of greater TTS as Ward et al and Yamamoto et al indicate.
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変動騒音による一過性聴力損失と回復について

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