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选6～12名听力正常的男学生(年龄18～22岁)为受试者,暴露于间断性和稳态连续性噪声(作用时间为8小时,噪声性质为粉红色噪声)后,测定其听力的暂时性阈移(TTS)和尿中的17-羟皮质类固醇(17-OHCS)。作用噪声呈梯形形式。其上升和下降时间为500毫秒,作用时期为6.5秒。间断噪声的峰值是80和90dB(A)。噪声暴露类型为:(1) 对照试验。(2) 峰值为90dB (A)暴露2分钟。(3) 峰值为90dB(A)暴露1分
Six to 12 male students (aged 18-22 years) with normal hearing were selected as subjects and exposed to intermittent and steady-state continuous noise (action time: 8 hours, noise property: pink noise) Temporary hearing threshold (TTS) and urinary 17-hydroxycorticosteroid (17-OHCS). The role of noise was trapezoidal form. The rise and fall time of 500 milliseconds, the duration of 6.5 seconds. Intermittent noise peaks at 80 and 90 dB (A). The types of noise exposure are: (1) Control test. (2) Peak 90dB (A) Exposure for 2 minutes. (3) Peak 90dB (A) Exposure 1 point