Study type: Epidemiological study (observational study)

Cardiovascular risk under electromagnetic exposure epidem.

Published in: Environmentalist 2007; 27 (4): 539-543

Aim of study (acc. to author)

A case-control study was conducted in Bulgaria to investigate long-term effects of electromagnetic fields on the cardiovascular system of medical staff in physiotherapy.

Further details

The electromagnetic field exposure (50 Hz, 150 kHz, 27.12 MHz, 2.45 GHz and optical radiation) was assessed from physiotherapy devices. The relative values of electromagnetic radiation for the whole frequency range in each physiotherapy were calculated and the obtained quota was much larger than 1 in comparison to the reference values. Individual assessment of electromagnetic field exposure was based on number of physiotherapy devices, calculated values of exposure per device/per one person, number of patients, and acutal configuration of the ward.

Endpoint/type of risk estimation



Exposure groups

Group Description
Reference group 1 personnel without any electromagnetic field exposure
Group 2 physiotherapists working with electromagnetic fields emitting devices


Case group

Control group

Study size

Cases Controls
Eligible 52 52
Statistical analysis method:

Results (acc. to author)

The total cholesterol (TC), high density lipoprotein cholesterol (HDL-C), and low density lipoprotein cholesterol (LDL-C) levels were significantly increased in the exposed group compared to the unexposed group. No significant differences were found for blood pressure or BMI. The data showed higher risk for becoming dyslipidemic for physiotherapists working with electromagnetic fields emitting devices.
The authors concluded that the electromagnetic field exposure of medical staff in physiotherapy could be associated with adverse effects on the cardiovascular system.

Study funded by

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