Study type: Medical/biological study (experimental study)

Toxicity bioassay in Sprague-Dawley rats exposed to 20 kHz triangular magnetic field for 90 days med./bio.

By: Kim SH, Lee HJ, Choi SY, Gimm YM, Pack JK, Choi HD, Lee YS
Published in: Bioelectromagnetics 2006; 27 (2): 105-111
Download citation in RIS format

Aim of study (acc. to editor)

To study possible toxic effects of 20 kHz intermediate frequency magnetic field (which is the field from TV and PC monitors) in rats.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 20 kHz
Exposure duration: repeated daily exposure, 8 h/day, 5 days a week for 90 days

General information

Both sham or MF exposure groups consisted of 10 male and 10 female rats.

Exposure 1

Main characteristics
Frequency 20 kHz
Type
Waveform
  • sawtooth-shaped
Exposure duration repeated daily exposure, 8 h/day, 5 days a week for 90 days
Additional info Reference article: Yoo DS. 2002. EMF standards and researches in Korea. Proc WHO Meeting on EMF Biological Effects and Standards Harmonization in Asia and Oceania, Seoul, Korea, 22-24 October, pp 73-74
Exposure setup
Exposure source
Setup the 1.5 m x 1.5 m x 1.5 m exposure system consisted of 4 horizontal and 4 vertical wood frames on which the coils were wound; only the horizontal coils were used in these experiments; coils made of 1.2 mm enamel coated copper wire; 2 wood panels (1 m x 1 m) inside the coils system on which the polycarbonate shoebox cages (420 mm x 260 mm x 180 mm) were placed
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 6.25 µT effective value measured - -
Additional parameter details

60 Hz MF component due to electrical power line was measured to be about 0.11 µT.

Measurement and calculation details

Magnetic field density and uniformity at the two panels were measured by 3 axis magnetic field probe.

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Data showed no significant differences in the analyses between exposed and sham-exposed rats. Therefore, the authors conclude that there were no significant toxicities, evidenced by serological, serum biochemical, urine, and histological examination, in rats exposed to 20 kHz intermediate frequency magnetic field-exposure for 90 days.

Study character:

Study funded by

Related articles