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Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea.
Neurotoxicology. 2010 Jan; 31(1):10-6.N

Abstract

BACKGROUND

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.

METHODS

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, <or=0.04 Hz), low frequency (LF, 0.04-0.15 Hz), high frequency (HF, 0.15-0.4 Hz), total power (TP, approximately <or=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.

RESULTS

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 microg/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 (beta=-0.193, p=0.0469) and in the first decade of age in Banwol area (beta=-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.

CONCLUSIONS

The results suggest that mercury may affect the cardiac autonomic activity through parasympathetic dysfunction even at low exposure levels.

Links

Publisher Full Text

Authors+Show Affiliations

Lim S
Department of Occupational and Environmental Medicine, College of Medicine, Kyunghee University, Seoul, Republic of Korea.
Chung HU
No affiliation info available
Paek D
No affiliation info available

MeSH

AdolescentAdultAge FactorsAgedAged, 80 and overAnalysis of VarianceBlood PressureCardiovascular DiseasesChildChild, PreschoolCross-Sectional StudiesElectrocardiographyFemaleHairHeart RateHumansIndustryKoreaMaleMercuryMiddle AgedRegression AnalysisResidence CharacteristicsRisk FactorsSignal Processing, Computer-AssistedYoung Adult

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19833149

Citation

Lim, Sinye, et al. "Low Dose Mercury and Heart Rate Variability Among Community Residents Nearby to an Industrial Complex in Korea." Neurotoxicology, vol. 31, no. 1, 2010, pp. 10-6.
Lim S, Chung HU, Paek D. Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea. Neurotoxicology. 2010;31(1):10-6.
Lim, S., Chung, H. U., & Paek, D. (2010). Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea. Neurotoxicology, 31(1), 10-6. https://doi.org/10.1016/j.neuro.2009.10.001
Lim S, Chung HU, Paek D. Low Dose Mercury and Heart Rate Variability Among Community Residents Nearby to an Industrial Complex in Korea. Neurotoxicology. 2010;31(1):10-6. PubMed PMID: 19833149.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Low dose mercury and heart rate variability among community residents nearby to an industrial complex in Korea. AU - Lim,Sinye, AU - Chung,Hee-Ung, AU - Paek,Domyung, Y1 - 2009/10/13/ PY - 2009/05/11/received PY - 2009/09/19/revised PY - 2009/10/05/accepted PY - 2009/10/17/entrez PY - 2009/10/17/pubmed PY - 2010/4/14/medline SP - 10 EP - 6 JF - Neurotoxicology JO - Neurotoxicology VL - 31 IS - 1 N2 - BACKGROUND: 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. METHODS: 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, <or=0.04 Hz), low frequency (LF, 0.04-0.15 Hz), high frequency (HF, 0.15-0.4 Hz), total power (TP, approximately <or=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. RESULTS: 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 microg/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 (beta=-0.193, p=0.0469) and in the first decade of age in Banwol area (beta=-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. CONCLUSIONS: The results suggest that mercury may affect the cardiac autonomic activity through parasympathetic dysfunction even at low exposure levels. SN - 1872-9711 UR - https://www.unboundmedicine.com/medline/citation/19833149/Low_dose_mercury_and_heart_rate_variability_among_community_residents_nearby_to_an_industrial_complex_in_Korea_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0161-813X(09)00224-1 DB - PRIME DP - Unbound Medicine ER -