Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Int Arch Occup Environ Health. 2020 Nov;93(8):975-982. doi: 10.1007/s00420-020-01545-2. Epub 2020 May 6.
Previous studies have indicated a significant association between exposure to noise and blood pressure. However, the effects of exposure to different noise frequency patterns on blood pressure components and hypertension (HTN) have been unknown.
We recruited a total of 518 eligible workers in this study. According to types of work (office and production-line), overall A-weighted equivalent sound pressure levels (8-h LAeq), and total 8-h LAeq at low (31.5, 63, and 125 Hz), medium (250, 500, and 1000 Hz), and high ( 2, 4, and 8 kHz) frequencies, we classified subjects into four categories, involving office workers (n = 214) exposed to overall 8-h LAeq < 65 dB and production-line workers, including medium noise exposure group (n = 81) exposed to overall 8-h LAeq < 78 dB that difference between the medium and high frequencies was less than 1 dB, high_A noise exposure group (n = 86) encountered to overall 8-h LAeq > 90 dB that the difference between the medium and high frequencies was less than 1 dB, and high B noise exposure group (n = 137) exposed to overall 8-h LAeq > 90 dB that the levels of noise at the high frequency were 10 dBA more than the medium frequency. The high A and high B groups were a little difference in total 8-h LAeq at the low and medium frequencies (≤ 3 dBA) and a wide difference at the high frequency (more than 10 dBA). The logistic regression models were applied to determine the odds of HTN among study groups.
The significant difference was observed among study groups in the average of systolic blood pressure (SBP), pulse pressure (PP), mean arterial pressure (MAP), and the frequency of HTN (P < 0.05). Also, we found a significant difference in diastolic blood pressure DBP but at the levels of P < 0.10. The odds ratios (ORs) and 95% confidence intervals (CIs) of HTN according to the full adjusted model in the medium, high A, and high B groups compared with the office workers were estimated at 1.66(0.45, 6.10), 2.34(0.80, 6.89), and 4.02(1.63, 9.96), respectively.
This study indicates noise frequency patterns may play a significant role in the association between noise and blood pressure. More studies are warranted to confirm our findings.
以往的研究表明，噪声暴露与血压之间存在显著关联。然而，接触不同噪声频率模式对血压成分和高血压（HTN）的影响尚不清楚。
我们共招募了本研究中的 518 名符合条件的工人。根据工作类型（办公室和生产线）、整体 A 加权等效声压级（8 小时 LAeq）以及低（31.5、63 和 125 Hz）、中（250、500 和 1000 Hz）和高（2、4 和 8 kHz）频率的总 8 小时 LAeq，我们将受试者分为四类，包括接触整体 8 小时 LAeq<65 dB 的办公室工作人员（n=214）和接触整体 8 小时 LAeq<78 dB 的生产线工作人员，其中中高频差小于 1 dB 的为中噪声暴露组（n=81），中高频差小于 1 dB、整体 8 小时 LAeq>90 dB 的为高 A 噪声暴露组（n=86），中高频差小于 1 dB、高频噪声水平比中频噪声高 10 dBA 的为高 B 噪声暴露组（n=137）。高 A 和高 B 组在低频和中频的总 8 小时 LAeq 上只有很小的差异（≤3 dBA），而在高频上的差异很大（超过 10 dBA）。应用逻辑回归模型确定各组中 HTN 的优势比（OR）。
各组间平均收缩压（SBP）、脉压（PP）、平均动脉压（MAP）和 HTN 频率存在显著差异（P<0.05）。同时，我们发现舒张压（DBP）水平也存在显著差异，但 P<0.10。中、高 A 和高 B 组与办公室工作人员相比，根据全调整模型，HTN 的比值比（OR）和 95%置信区间（CI）分别估计为 1.66（0.45，6.10）、2.34（0.80，6.89）和 4.02（1.63，9.96）。
本研究表明，噪声频率模式可能在噪声与血压之间的关联中起重要作用。需要进一步研究来证实我们的发现。
