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Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea

The effect of mercury on the cardiovascular system has been recently reported, but the mechanisms and its nature, especially in low dose ranges, still need to be confirmed. In this cross-sectional study, the hair mercury was analyzed in relation to the cardiac autonomic activity among community resi...

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Published in:Neurotoxicology (Park Forest South) 2010, Vol.31 (1), p.10-16
Main Authors: Lim, Sinye, Chung, Hee-Ung, Paek, Domyung
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description The effect of mercury on the cardiovascular system has been recently reported, but the mechanisms and its nature, especially in low dose ranges, still need to be confirmed. In this cross-sectional study, the hair mercury was analyzed in relation to the cardiac autonomic activity among community residents nearby to an industrial complex in Korea. A hair sample was obtained from the occiput and was analyzed using a DMA-80 (Milestone ®, Italy) mercury analyzer. We measured cardiovascular risk factors, including serum total cholesterol, serum triglyceride, HDL cholesterol, systolic and diastolic blood pressure, body mass index (BMI), past history of hypertension, diabetes, and dyslipidemia as potential confounders. As an end point, heart rate variability was assessed for 5 min, in time and frequency domains, using SA-3000P (Medi-core ®, Korea). For the time domain, standard deviation of the NN intervals (SDNN) was measured. For the frequency domains, very low frequency (VLF, ≤0.04 Hz), low frequency (LF, 0.04–0.15 Hz), high frequency (HF, 0.15–0.4 Hz), total power (TP, ≈≤0.4 Hz), LF/HF ratio, LF norm (LF/LF + HF), and HF norm (HF/LF + HF) were measured. The association between hair mercury concentration and heart rate variability was assessed after controlling for covariates, including age, gender, socioeconomic status, and other relevant cardiovascular risk factors. In total, 1589 subjects with a mean age of 33 years (range: 5–83) were included in the final analysis. Hair mercury concentration ranged from 0.01 to 13.36 ppm with a geometric mean of 0.83 μg/g. The hair mercury level was elevated for males, adults, and fish (especially sashimi) consumers, and higher household income group. When age was categorized into decades and analyzed separately, mercury significantly reduced HF measure in the second decade of age in Siwha area ( β = −0.193, p = 0.0469) and in the first decade of age in Banwol area ( β = −0.520, p = 0.0129). HF parameter decreased by 8.4% [95% confidence interval: 2.2–15.1%] with an 1 ppm increase in hair mercury concentration after adjusting for other selected variables in the multiple linear regression analysis. The results suggest that mercury may affect the cardiac autonomic activity through parasympathetic dysfunction even at low exposure levels.
doi_str_mv 10.1016/j.neuro.2009.10.001
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Toxic occupational diseases ; Child ; Child, Preschool ; Cross-Sectional Studies ; Electrocardiography ; Female ; Hair - metabolism ; Heart ; Heart Rate - physiology ; Heart rate variability ; Humans ; Industry ; Korea ; Male ; Medical sciences ; Mercury ; Mercury - metabolism ; Metals and various inorganic compounds ; Middle Aged ; Parasympathetic nervous system ; Regression Analysis ; Residence Characteristics ; Risk Factors ; Signal Processing, Computer-Assisted ; Toxicology ; Young Adult</subject><ispartof>Neurotoxicology (Park Forest South), 2010, Vol.31 (1), p.10-16</ispartof><rights>2009 Elsevier Inc.</rights><rights>2015 INIST-CNRS</rights><rights>2009 Elsevier Inc. 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In this cross-sectional study, the hair mercury was analyzed in relation to the cardiac autonomic activity among community residents nearby to an industrial complex in Korea. A hair sample was obtained from the occiput and was analyzed using a DMA-80 (Milestone ®, Italy) mercury analyzer. We measured cardiovascular risk factors, including serum total cholesterol, serum triglyceride, HDL cholesterol, systolic and diastolic blood pressure, body mass index (BMI), past history of hypertension, diabetes, and dyslipidemia as potential confounders. As an end point, heart rate variability was assessed for 5 min, in time and frequency domains, using SA-3000P (Medi-core ®, Korea). For the time domain, standard deviation of the NN intervals (SDNN) was measured. For the frequency domains, very low frequency (VLF, ≤0.04 Hz), low frequency (LF, 0.04–0.15 Hz), high frequency (HF, 0.15–0.4 Hz), total power (TP, ≈≤0.4 Hz), LF/HF ratio, LF norm (LF/LF + HF), and HF norm (HF/LF + HF) were measured. The association between hair mercury concentration and heart rate variability was assessed after controlling for covariates, including age, gender, socioeconomic status, and other relevant cardiovascular risk factors. In total, 1589 subjects with a mean age of 33 years (range: 5–83) were included in the final analysis. Hair mercury concentration ranged from 0.01 to 13.36 ppm with a geometric mean of 0.83 μg/g. The hair mercury level was elevated for males, adults, and fish (especially sashimi) consumers, and higher household income group. When age was categorized into decades and analyzed separately, mercury significantly reduced HF measure in the second decade of age in Siwha area ( β = −0.193, p = 0.0469) and in the first decade of age in Banwol area ( β = −0.520, p = 0.0129). HF parameter decreased by 8.4% [95% confidence interval: 2.2–15.1%] with an 1 ppm increase in hair mercury concentration after adjusting for other selected variables in the multiple linear regression analysis. The results suggest that mercury may affect the cardiac autonomic activity through parasympathetic dysfunction even at low exposure levels.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><pmid>19833149</pmid><doi>10.1016/j.neuro.2009.10.001</doi><tpages>7</tpages></addata></record>
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ispartof Neurotoxicology (Park Forest South), 2010, Vol.31 (1), p.10-16
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source ScienceDirect Journals
subjects Adolescent
Adult
Age Factors
Aged
Aged, 80 and over
Analysis of Variance
Biological and medical sciences
Blood Pressure
Cardiac dysrhythmias
Cardiology. Vascular system
Cardiovascular Diseases - etiology
Chemical and industrial products toxicology. Toxic occupational diseases
Child
Child, Preschool
Cross-Sectional Studies
Electrocardiography
Female
Hair - metabolism
Heart
Heart Rate - physiology
Heart rate variability
Humans
Industry
Korea
Male
Medical sciences
Mercury
Mercury - metabolism
Metals and various inorganic compounds
Middle Aged
Parasympathetic nervous system
Regression Analysis
Residence Characteristics
Risk Factors
Signal Processing, Computer-Assisted
Toxicology
Young Adult
title Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea
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