To study the effects of long-term exposure (1-20 years) on clinical blood chemistry in workers chronically exposed to electromagnetic fields both at work and at home.
The exposure and the control groups comprised 15 subjects each. The exposed volunteers worked in extra high voltage substations (225 kV and 400 kV) and lived nearby under power lines. Their main tasks included installing couplings between extra high voltage Iines and voltage transformers. Blood samples were taken hourly from 20 h to 8 h.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
continuous for 1-20 years
|
|
| Frequency | 50 Hz |
|---|---|
| Exposure duration | continuous for 1-20 years |
| Exposure source |
|
|---|---|
| Additional info | extra high voltage substations (occupational) and power lines (residential exposure) of a 225 kV and 400 kV electricity transmission network |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 0.72 µT | mean | - | - | - |
| magnetic flux density | 0.64 µT | mean | - | - | during daytime |
| magnetic flux density | 0.82 µT | mean | - | - | during nighttime (residential) |
The data suggest that long-term exposure to 50 Hz magnetic fields (exposure > 0.3 µT) in healthy men could induce some biological modifications of certain blood parameters (sodium, chloride, phosphorus, glucose). The clinical relevance of these findings needs further investigation.
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