2分以下の発生周期の間欠騒音の生体におよぼす実験的研究-1過性聴力損失と唾液中の Cortisol Level の変動- : 第1報ピーク値が高い場合

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Audiometrically normal, male students (8-9 persons) were exposed to several intermittent and steady-state noises (90 minutes), then TTS growth and saliva cortisol levels were measured.The results were;1) There was no significant difference between the TTS induced by intermittent noises (On Fractions 5% and 10%) and that induced by steady-state noises whose sound levels were 3 or 7dB (A) lower than the equal energy noises.2) The TTS induced by intermittent noises of On Fraction 25% was midway between that induced by steady-state noise at the same level as that of the equal energy noise, and TTS induced by steady-state noise whose level was 4dB (A) lower than that of equal energy noise.3) The TTS induced by intermittent noise of On Fraction 50% was neary the level of that induced by steady-state noise whose level was the same as that of equal energy noise.4) Sixty or ninety minutes after the onset of noise exposure, the saliva cortisol levels were lower than pre-exposure levels of the hormon for most of the experimental groups.5) Thirty minutes after the onset of noise exposure, the saliva cortisol levels rose under exprimental conditions in which the sounds levels were 80 and 84dB (A), but under other experimental conditions the saliva cortisol levels decresed.
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