Study type: Medical/biological study (experimental study)

Electromagnetic field exposure (50 Hz) impairs response to noxious heat in American cockroach. med./bio.

Published in: J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2018; 204 (6): 605-611

Aim of study (acc. to author)

To examine whether exposure of cockroaches to a 50 Hz magnetic field influences the escape latency from noxious heat and alters oxidative stress related parameters.

Background/further details

Three groups were examined (n=20 per group): 1) exposure for 24 hours, 2) exposure for 72 hours and 3) exposure for 7 days. For every exposure group, a control group was (also n=20 per group) sham exposed for the same time span. The cockroaches were exposed together but examined individually.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: 24 hours
Exposure 2: 50 Hz
Exposure duration: 72 hours
Exposure 3: 50 Hz
Exposure duration: 7 days

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Waveform
Exposure duration 24 hours
Exposure setup
Exposure source
Chamber cockroaches were placed in a cylindrical glass chamber (10 cm x 7.5 cm; volume 0.589 l) without movement restriction
Setup magnetic field was generated by one coil with a diameter of 20 cm; maximum inhomogeneity was 10% inside the coil; temperature was monitored using thermocouples mounted under each exposure system
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 7 mT - measured - -

Exposure 2

Main characteristics
Frequency 50 Hz
Type
Waveform
Exposure duration 72 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 7 mT - measured - -

Exposure 3

Main characteristics
Frequency 50 Hz
Type
Waveform
Exposure duration 7 days
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 7 mT - measured - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

The escape latency was significantly longer in exposed cockroaches compared to the corresponding sham exposed animals. Additionally, the lipid peroxidation was significantly increased in all exposed cockroaches compared to the corresponding sham exposure, while the glutathione level was only significantly decreased after 7 days of exposure when compared to 7 days sham exposure.
The authors conclude that 50 Hz magnetic fields could impair heat perception in cockroaches and influence the oxidative balance.

Study character:

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