Spioch F M, Debowski M T
Instytutu Medycyny Pracy w Przemyśle Weglowym i Hutniczym w Sosnowcu.
Med Pr. 1991;42(5):321-6.
Temporary threshold shifts were determined in 14 voluntary subjects who were exposed during one hour to noise levels 70, 85 and 100 dB(A) accompanied by physical exercise (30% VO2max), thermal load (TE = 32.0 +/- 0.8 degrees C), and after combined exposure to these three factors. Before and after each exposure, temporary were measured threshold shifts (TTS2) at frequencies 3, 4 and 6 kHz. The psychophysical fatigue was determined using flicker and blinking tests. The results showed that exposure to noise, noise and thermal load, noise and exercise, and combined noise-exercise -thermal load exposure induced statistically significant increases of TTS values, especially at 85 and 100 dB(A) noise levels. Noise and thermal load, noise and exercise, and the combination of the three did not cause psychophysical fatigue, probably on account of the short duration of exposure. The results of this work show that estimation of exposure to noise, performed by measuring noise levels at workplaces and comparing them with the current standards without considering the effects of exercise and/or thermal load is not sufficient to evaluate occupational exposure and the risk of permanent hearing loss.
在14名自愿受试者中测定了暂时性阈移，这些受试者分别在1小时内暴露于70、85和100 dB(A)的噪声水平下，同时伴有体育锻炼（最大摄氧量的30%）、热负荷（体温 = 32.0±0.8摄氏度），以及在同时暴露于这三个因素之后。在每次暴露前后，测量3、4和6千赫兹频率下的暂时性阈移（TTS2）。使用闪烁和眨眼测试来确定心理生理疲劳。结果表明，暴露于噪声、噪声与热负荷、噪声与运动以及噪声 - 运动 - 热负荷联合暴露会导致TTS值有统计学意义的增加，尤其是在85和100 dB(A)的噪声水平下。噪声与热负荷、噪声与运动以及三者的组合并未引起心理生理疲劳，可能是由于暴露时间较短。这项工作的结果表明，通过测量工作场所的噪声水平并将其与现行标准进行比较来估计噪声暴露，而不考虑运动和/或热负荷的影响，不足以评估职业暴露和永久性听力损失的风险。
