Medium noise levels are very common in work environments, and few studies have addressed their effects. This study aims to investigate the effects of real noise levels from four types of workplaces on psychophysiological responses. Thirty-one normal hearing male subjects were recruited. They were asked to judge the noise annoyance (NA) and noise-induced subjective load (NISL) of four occupational environments involved cognitive functions; closed office rooms (CO:57.8–65.2 dB(A), open-plan offices (OPO:65–71.8 dB(A), control rooms (CR:68.7–75 dB(A), and industrial noise (IN:75.5–81 dB(A). Meanwhile, the electrodermal activity (EDA), heart rate (HR), and respiration rate (RR) were monitored throughout the experiments. The saliva cortisol of subjects was also analyzed before and after each trial. The results were evaluated in the view of impact of noise and moderating factors using linear and mixed models, and a dose–response relationship was found for each response. The results showed that the NA were rated 26.5%, 39.5%, 53%, and 72.2%, in the CO, OPO, CR, and IN, respectively, and NISL increase in levels ≥ 65 dB(A)(OPO). In addition to subjective effects, the medium levels of occupational noise can significantly affect the physiological responses in view of the moderating factors. In total, the EDA and RR responses increased, whereas HR initially increased and then decreased. According to the regression models, it seems that medium levels of occupational noise have significant and linear effects on EDA, RR, and HR in levels ≥ 60 (CO), ≥ 65 (OPO), and ≥ 69 dB(A) (CR), respectively. Moreover, the levels range of 60–70 dB(A) (CO and OPO) can increase mean of cortisol level more than the levels range of 70–80 dB(A) (CR and IN).

中文翻译：

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对中等水平的职业噪声的心理生理反应：暴露-反应关系。

中等噪声水平在工作环境中非常普遍，很少有研究解决它们的影响。这项研究旨在调查来自四种类型工作场所的实际噪声水平对心理生理反应的影响。招募了31名正常听力的男性受试者。他们被要求判断涉及认知功能的四个职业环境的噪声烦恼（NA）和噪声诱发的主观负荷（NISL）。封闭式办公室（CO：57.8–65.2 dB（A），开放式办公室（OPO：65–71.8 dB（A），控制室（CR：68.7–75 dB（A）和工业噪声（IN：75.5– 81 dB（A）。同时，在整个实验过程中监测其皮肤电活动（EDA），心率（HR）和呼吸频率（RR），并在每次试验前后对受试者的唾液皮质醇进行分析。使用线性和混合模型，根据噪声和调节因素的影响对结果进行了评估，并发现每种反应的剂量反应关系。结果表明，CO，OPO，CR和IN中的NA分别为26.5％，39.5％，53％和72.2％，NISL≥65 dB（A）（OPO）时升高。除主观影响外，鉴于调节因素，中等水平的职业噪声会显着影响生理反应。总体而言，EDA和RR响应增加，而HR则先上升然后下降。根据回归模型，似乎中等水平的职业噪声对EDA，RR和HR具有≥60（CO），≥65（OPO）和≥69 dB（A）（CR）的水平具有显着线性影响。 ， 分别。此外，