Study type: Medical/biological study (experimental study, observational study)

Occupational exposure to high frequency electromagnetic fields and its effect on human immune parameters. med./bio.

Published in: Int J Occup Med Environ Health 1999; 12 (3): 239-251

Aim of study (acc. to author)

The study was performed on blood samples of physiotherapists to investigate a possible effect of long-term high frequency exposure (emitted by therapeutic diathermy devices used for medical treatment) on immune parameters, in particular leucocyte subpopulations and the reactivity of T cells.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 27.12 MHz
Exposure duration: 10 min
Exposure 2: 433.92 MHz
Exposure duration: 10 min
Decimeter diathermy device
-
Exposure 3: 2.45 GHz
Modulation type: CW
Exposure duration: 10 min
-

General information

Limits according to Austrian Standards for EF and MF are 67.9 V/m and 0.18 A/m for shortwave (27.12 MHz), 73.7 V/m and 0.19 A/m for decimeter (433.92 MHz) and 137 V/m and 0.36 A/m for microwave (2.45 GHz) diathermy devices, respectively.

Exposure 1

Main characteristics
Frequency 27.12 MHz
Type
Exposure duration 10 min
Additional info short wave diathermy device
Exposure setup
Exposure source
Distance between exposed object and exposure source 0 m
Setup The positions where therapists usually stand during the treatment of patients were selected for evaluation.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 61.4 V/m minimum measured - 40 cm above the floor
electric field strength 868.3 V/m maximum measured - 40 cm above the floor
electric field strength 67.3 V/m minimum measured - 85 cm above the floor
electric field strength 1,000 V/m maximum measured - 85 cm above the floor
electric field strength 30.7 V/m minimum measured - 95 cm above the floor
electric field strength 1,000 V/m maximum measured - 95 cm above the floor
electric field strength 13.7 V/m minimum measured - 135 cm above the floor
electric field strength 180 V/m maximum measured - 135 cm above the floor
electric field strength 6 V/m minimum measured - 175 cm above the floor
electric field strength 42 V/m maximum measured - 175 cm above the floor
magnetic field strength 0.42 A/m minimum measured - 40 cm above the floor
magnetic field strength 1 A/m maximum measured - 40 cm above the floor
magnetic field strength 0.8 A/m minimum measured - 85 cm above the floor
magnetic field strength 1.21 A/m maximum measured - 85 cm above the floor
magnetic field strength 0.6 A/m minimum measured - 95 cm above the floor
magnetic field strength 1.09 A/m maximum measured - 95 cm above the floor
magnetic field strength 0.15 A/m minimum measured - 135 cm above the floor
magnetic field strength 0.18 A/m maximum measured - 135 cm above the floor
magnetic field strength 0.09 A/m - measured - 175 cm above the floor

Exposure 2

Main characteristics
Frequency 433.92 MHz
Type
Exposure duration 10 min
Additional info Decimeter diathermy device
Exposure setup
Exposure source
Distance between exposed object and exposure source 0 m
Parameters

No parameters are specified for this exposure.

Exposure 3

Main characteristics
Frequency 2.45 GHz
Type
Exposure duration 10 min
Additional info Microwave diathermy device
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 0 m
Parameters

No parameters are specified for this exposure.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

There were no statistically significant differences between the control and exposed persons. In both groups all immune parameters were within normal ranges.

Study character:

Study funded by

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