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Background There are few studies on the arterial compliance of noise exposure.The purpose of this study was tounderstand the relationship between hearing loss,blood pressure and arterial compliance of female workers whoexposed to occupational noise in a textile mill.Methods The noise levels in the workplace were measured with a HS6288 sound level meter.Cumulated noiseexposure(CNE)was calculated according to the noise intensity and the exposure period.Hearing ability and arterialcompliance were measured in 618 noise exposed workers.The database was set up with EpiData and the statisticalanalysis was performed with SAS software 9.1.3.Results The noise levels were 80.1dB(A)to 113.5dB(A),of which the levels at 92.5% of the noise monitoring sites wereover the national standard.The incidence of high frequency hearing loss(HFHL)was 24.43% and language frequencyhearing impairment(LFHI)was 0.81%.The incidence of hypertension was 7.93%.Both systolic blood pressure(SBP)and diastolic blood pressure(DBP)in the high frequency hearing loss group were significantly higher than those in thenormal hearing group(P<0.05),while C_1(large artery compliance)and C_2(small artery compliance)were significantlylower(P<0.05).The high frequency hearing threshold(HFHT)of the hypertension group was significantly higher than inthe normal blood pressure group(P<0.05),while C_1 and C_2 were significantly lower(P<0.05).C_1 and C_2 had a negativecorrelation with HFHT,SBP,DBP,mean of arterial pressure(MAP),pulse pressure(PP)and pulse rate(PR)(P<0.05).The multiple regression analyses showed that blood pressure and PR were the main influencing factors on C_1 and C_2.LFHT was an influence on C_2 and HFHT on C_1.Conclusions Textile mill noise pollution is very serious and has an obvious influence on worker’s auditory function.Thefemale workers with low artery compliance or with high blood pressure might be suffering from hearing loss;those withnoise induced hearing loss might be suffering from hypertension if she is constantly exposed to loud industrial noise.Chin Med J 2007;120(15):1309-1313
Background There are few studies on the arterial compliance of noise exposure. The purpose of this study was tounderstand the relationship between hearing loss, blood pressure and arterial compliance of female workers whoexposed to occupational noise in a textile mill. Methods The noise levels in the workplace were measured with a HS6288 sound level meter. Cumulated noise exposure (CNE) was calculated according to the noise intensity and the exposure period. Hearing ability and arterial compliance were measured in 618 noise exposed workers. The database was set up with EpiData and the statisticalanalysis was performed with SAS software 9.1.3. Results The noise levels were 80.1 dB (A) to 113.5 dB (A), of which the levels at 92.5% of the noise monitoring sites were over the national standard. The incidence of high frequency hearing loss (HFHL ) was 24.43% and language frequencyhearing impairment (LFHI) was 0.81% .The incidence of hypertension was 7.93% .Both systolic blood pressure (SBP) and diastolic blood pressure (DBP) in the high frequency hearing loss group were significantly higher than those in normal hearing group (P <0.05), while C_1 (large artery compliance) and C_2 (small artery compliance) frequency hearing threshold (HFHT) of the hypertension group was significantly higher than inthe normal blood pressure group (P <0.05), while C_1 and C_2 were significantly lower (P <0.05) .C_1 and C_2 had a negativecorrelation with HFHT, SBP, DBP , mean of arterial pressure (MAP), pulse pressure (PP) and pulse rate (PR) (P <0.05). The multiple regression analyzes showed that blood pressure and PR were the main influencing factors on C_1 and C_2.LFHT was an influence on C_2 and HFHT on C_1.Conclusions Textile mill noise pollution is very serious and has an obvious influence on worker’s auditory function. The female workers with low artery compliance or with high blood pressure might be suffering from hearing loss; those with noise induced hearing loss might be suffering from hypertension if she is may exposed to loud industrial noise. Chin Med J 2007; 120 (15): 1309-1313