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Chronic exposure to 2.9 mT, 40 Hz magnetic field reduces melatonin concentrations in humans
Author(s) -
Karasek Michal,
WoldanskaOkonska Marta,
Czernicki Jan,
Zylinska Krystyna,
Swietoslawski Jacek
Publication year - 1998
Publication title -
journal of pineal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 131
eISSN - 1600-079X
pISSN - 0742-3098
DOI - 10.1111/j.1600-079x.1998.tb00393.x
Subject(s) - melatonin , nocturnal , morning , endocrinology , medicine , circadian rhythm , pineal gland
Karasek M, Woldanska‐Okonska M, Czernicki J, Zylinska K, Swietoslawski J. Chronic exposure to 2.9 mT, 40 Hz magnetic field reduces melatonin concentrations in humans. J. Pineal Res. 1998; 25:240–244. © Munksgaard, Copenhagen Abstract Diurnal rhythm of serum melatonin concentrations was estimated in 12 men with low back pain syndrome before and after exposure to a very low‐frequency magnetic field (2.9 mT, 40 Hz, square wave, bipolar). Patients were exposed to the magnetic field for 3 weeks (20 min per day, 5 days per week) either in the morning (at 10: 00 hr) or in the late afternoon (at 18: 00 hr). Significant depression in nocturnal melatonin rise was observed regardless of the time of exposure. This phenomenon was characteristic for all the subjects, although the percent of inhibition of melatonin secretion varied among the studied individuals.