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KMID : 0382419990250040024
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Korean Journal of Environmental Health Society
1999 Volume.25 No. 4 p.24 ~ p.35
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Exposure Assessment and Effect of Heart Rate Associated with Exposure to Magnetic Fields
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Abstract
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The objective of this study was to evaluate heart rate, ST segment in ventricular, and ventricular premature beat for cardiac function and exposure of magnetic field between high-exposure group and low-exposure group. An experimental study was performed for four month of study period of December 1998-March 1999 to assess 24 hr personal exposure level using EMDEXII and heart rate beat using Holter for subject. Subjects were 45 physically and mentally healthy male volunteers, and assigned to two groups. High-exposure group was 23 male volunteers; 9 subway drivers, 7 electric workers, and 7 transformer substation workers (mean age : 29.9±4.0, mean BMI : 22.66±2.2). The low-exposure group was 22 male volunteers; 10 students and 12 official workers (mean age : 30.4±4.6, mean BMI : 23.10±2.4). Informed consent was obtained from each subject. There was not a significant difference for the average heart rates beats between high-exposure and low-exposure groups. The mean 24hr personal exposure levels of high-exposure group were 0.73 μT, whereas low-exposure group were 0.08 μT. High-exposure group were exposed more highly while at work. But 5 subject who working period more than five years in high-exposure group were significant difference between heart rate beats and exposure to magnetic field levels(p=0.037). Finally, this study would provide significant data for furture study of risk assessment of magnetic fields. A large scale study concerning more detailed exposure assessment should provide important information on health risk assessment of MFs. Further study should provide information on the contribution of various sources and the relationship between cardiac autonomic function and exposure of magnetic fields.
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