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Rats were exposed continuously to a rotating magnetic field at 1, 5, 50, or 250 \u03bcT (spatial vector rms) for 6 weeks, except for twice\u2010weekly breaks of about 2 h for cleaning of cages and feeding. The rats were housed in exposure and sham\u2010exposure facilities, which were located in the same room, under a 12:12 light\u2010dark photoperiod (lights on at 06:00 h). The room was constantly illuminated by 4 small, dim red lights (&lt; 0.07 lux in dark period). Levels of plasma and pineal gland melatonin were determined by radioimmunoassay. A significant decrease of melatonin was observed between the control group and groups exposed to a magnetic field at a flux density in excess of l \u03bcT during the night time, but no statistical differences were found among the exposed groups. These results indicate that subchronic exposure of albino rats to a 50\u2010Hz rotating magnetic field influences melatonin production and secretion by the pineal gland. \u00a9 1993 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/bem.2250140203","type":"journal-article","created":{"date-parts":[[2006,2,4]],"date-time":"2006-02-04T00:56:17Z","timestamp":1139014577000},"page":"97-106","source":"Crossref","is-referenced-by-count":130,"title":["Effects of exposure to a circularly polarized 50\u2010Hz magnetic field on plasma and pineal melatonin levels in rats"],"prefix":"10.1002","volume":"14","author":[{"given":"Masamichi","family":"Kato","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ken\u2010Ichi","family":"Honma","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tsukasa","family":"Shigemitsu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoichi","family":"Shiga","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,10,19]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"R885","article-title":"Seasonal variation in the human circadian rhythm: Dissociation between sleep and temperature rhythm","volume":"262","author":"Honma K","year":"1992","journal-title":"Am J Physiol"},{"key":"e_1_2_1_3_1","unstructured":"KatoM HonmaK ShigemitsuT(1991): Effects of 50\u2010Hz rotating magnetic fields on melatonin secretion of rat. 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