Medical/biological study (observational study)

No association of 6-sulfatoxymelatonin with in-bed 60-Hz magnetic field exposure or illumination level among older adults.

Published in: Environ Res 2002; 89 (3): 201-209

Aim of study (acc. to author)

To examine whether there is an association between nocturnal exposure to 60 Hz magnetic fields and 6-sulphatoxy melatonin level in urine of older adults.
Background/further details: In total, 242 subjects (224 female, 16 male) participated in the study (mean age 67.6 years). During one week, the magnetic field levels were measured as close as possible to the subject's head during sleep. Urine was collected by the subjects on two days (approximately 3 days apart) for somewhat longer than 24 hours.



Exposure Parameters
Exposure 1: 60 Hz
Exposure duration: 1 week during sleep
Exposure 1
Main characteristics
Frequency 60 Hz
Exposure duration 1 week during sleep
Exposure setup
Exposure source
  • domestic appliances, inhouse wiring
Measurand Value Type Method Mass Remarks
magnetic flux density 6.31 µT maximum measured - in bed/under pillow
magnetic flux density 100 nT mean measured - in bed/under pillow
Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated material:
  • isolated bio./chem. substance
  • investigation on living organism
Investigated organ system:
Time of investigation:
  • before exposure
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

No association between the magnetic field exposure and the urinary level of 6-sulfatoxymelatonin was found.
The authors conclude, that the data suggest no influence of nocturnal 60 Hz magnetic field exposure on 6-sulfatoxymelatonin excretion in older adults.
Study character:

Study funded by

  • National Institute of Environmental Health Sciences (NIEHS), North Carolina, USA

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