title: Rapid-onset/offset, variably scheduled 60 Hz electric and magnetic field exposure reduces nocturnal serum melatonin concentration in nonhuman primates.
abstract: Experiments with rodents indicate that power-frequency electric field (EF) or magnetic field (MF) exposure can suppress the normal nocturnal increase in melatonin concentration in pineal gland and blood. In a separate set of three experiments conducted with nonhuman primates, we did not observe melatonin suppression as a result of 6 weeks of day-time exposure to combined 60 Hz electric and magnetic fields (E/MF) with regularly scheduled "slow" E/MF onsets/offsets. The study described here used a different exposure paradigm in which two baboons were exposed to E/MF with "rapid" E/MF onsets/offsets accompanied by EF transients not found with slowly ramped E/MF onset/offset; profound reductions in nocturnal serum melatonin concentration were observed in this experiment. If replicated in a more extensive experiment, the observation of melatonin suppression only in the presence of E/MF transients would suggest that very specific exposure parameters determine the effects of 60 Hz E/MF on melatonin.
authors.affiliation: Department of Biosciences and Bioengineering, Southwest Research Institute, San Antonio, Texas 78228-0510, USA.
authors.forename: W R
authors.initials: WR
authors.lastname: Rogers
authors.forename: R J
authors.initials: RJ
authors.lastname: Reiter
authors.forename: H D
authors.initials: HD
authors.lastname: Smith
authors.forename: L
authors.initials: L
authors.lastname: Barlow-Walden
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D004574:Electromagnetic Fields / Q000009:adverse effects*; D008297:Male; D008550:Melatonin / Q000097:blood*; D010215:Papio; D013997:Time Factors
chemical_list: D008550:Melatonin