Study type: Medical/biological study (experimental study)

Investigation of electric current perception thresholds of different EHS groups. med./bio.

Published in: Bioelectromagnetics 2007; 28 (3): 208-213

Aim of study (acc. to author)

To analyze whether the electric current perception threshold of different groups of persons reporting electromagnetic hypersensitivity differs significantly from the general population and to which extent recruitment influences the results, three groups of self-declared electromagnetic hypersensitive persons were investigated. Self-declared electromagnetic hypersensitivity persons were selected 1) from members of a self aid group (25 women and 12 men), 2) from responders to a newspaper call (23 women and 6 men), and 3) from persons actively asking for investigations in their search for help (15 women and 9 men).

Background/further details

In this study, the term "electrosensitivity" addresses the ability of a person to perceive electric or electromagnetic exposures at lower levels than the major part of the general population.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: until first perception of current
-

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Exposure duration until first perception of current
Exposure setup
Exposure source
  • electrodes applied to both forearms of the testperson
Sham exposure A sham exposure was conducted.
Parameters

No parameters are specified for this exposure.

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed that quantitative electrosensitivity was quite different among the three groups. The members of the self aid group exhibit a considerable overlap with general population. Pooled together as a group it could be shown that hypersensitive persons differ significantly from the general population, however with a pronounced overlap with the normal range.
It can be concluded that electromagnetic hypersensitivity groups are very inhomogeneous and contain numerous persons with no increased ability to perceive low frequency electric or magnetic fields. This investigation shows the importance of the study design, in particular of the recruitment strategies of electromagnetic hypersensitivity persons.

Study character:

Study funded by

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