TABLE A4-10 Effects of Combined Sinusoidal Electric-and Magnetic-Field Exposure on Pineal Melatonin Production

Study

Species

Developmental Stage

Number per Group

Exposure Characteristics

End Points Evaluated

Outcome

Comments

Lee et al. 1993

Suffolk sheep (female)

Juvenile

10 per group

Exposed under 500-kV power line: continuous 6-kV electric and 4-µT magnetic fields; controls 225 m from power line; continuous <10-V/m electric and <0.03-µT magnetic fields

Blood melatonin between ages of 2 and 10 mon at 8 different times

No effect on 24-hr melatonin rhythms between exposed and controls

Thorough and well-supervised study

Rogers et al. 1995

Papio cynocephalus baboons (male)

Adult

3 per group

Random, intermittent (with rapid onset/offset) 30-kV/m electric and 100-µT magnetic field; animals served as own controls and run at another time in the same facility

Blood melatonin

Nighttime melatonin depressed in experiments

Animals served as own controls; therefore, controls not run simultaneously



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