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高频噪声对人耳的影响已有详细研究,而低频声对人耳影响的研究还很少。为研究低频和超低频噪声对耳蜗血管纹和细胞的影响,作者进行了动物实验。采用6～8个月的听器正常的54只豚鼠,用声频为4、31.5、63H z,声强为110dB的噪声进行实验,分别用上述声频刺激30分钟3小时及每天3小时共40天。以未经刺激的动物作对照。测豚鼠血管纹的血管组织和细胞中的硷性磷酸酶活性来判断噪声刺激后的变化。结果发现4Hz刺激30分钟时,血管纹的血管无明显狭窄改变,硷性磷酸酶活性有提高;刺激3小时者,血管纹的血管明显狭窄;每天刺激3小时共40天者,血管变亮,管腔扩大,表明有血管麻痹,此
The effects of high-frequency noise on the human ear have been studied in detail, and the impact of low-frequency sound on the human ear has been poorly studied. To investigate the effects of low frequency and ultra-low frequency noise on cochlear stria vascularis and cells, the authors conducted animal experiments. Fifty-four guinea pigs, normal to hearing aids for six to eight months, were tested for noise with acoustic frequencies of 4, 31.5, and 63 Hz, and sound intensities of 110 dB. The animals were stimulated with the above audio for 3 hours at 30 minutes for 3 hours and 3 hours per day for 40 days . Unstimulated animals as controls. Measure the activity of alkaline phosphatase in the vascular tissue and cells of guinea pig vascular pattern to determine the changes after noise stimulation. The results showed that at 4Hz stimulation for 30 minutes, there was no obvious stenosis of blood vessels in vascular pattern and the activity of alkaline phosphatase was increased. The blood vessel of stenosis was obviously stenosed in 3 hours, and 40 days in 3 hours stimulation, The lumen is enlarged, indicating that there is vascular paralysis, this