Assessment of the effects of nocturnal exposure to 50-Hz magnetic fields on the human circadian system. A comprehensive study of biochemical variables.
The proposed laboratory investigation was designed to evaluate the effects of acute exposure to both continuous and intermittent magnetic fields (MFs) (50 Hz-10 microT) on the circadian rhythm of clinical chemistry variables in humans: electrolytes (magnesium, calcium, phosphorus, sodium, potassium, and chloride), enzymes (amylase, lipase, aldolase, gamma glutamyl-transferase [GGT], lactate dehydrogenase [LDH], aspartate aminotransferase [ASAT], and alkaline phosphatase [ALP]), lipids (cholesterol, high-density lipoprotein [HDL], apolipoprotein A1 [ApoA1], and ApoB), proteins (total proteins and albumin), nitrogen substances (uric acid, urea, and creatinine), iron, glycemia, and transferrin. Young volunteers (32 subjects; 16 exposed and 16 sham exposed) were selected according to the screening criteria. Each subject participated in two sessions held within a 4-week period. In the first session, one group of volunteers (16 subjects) was exposed to a continuous MF and then, in the second session, to an intermittent MF. The second group (16 subjects) served as a control for both sessions. At each session, blood samples were collected at 3 h intervals from 11:00 to 20:00 and hourly from 22:00 to 08:00. The results indicate that both continuous and intermittent 50-Hz linearly polarized MFs of 10 microT intensity have no effects on the circadian rhythms or on the levels of the variables studied here.
Selmaoui
B
B
Faculté de Médecine Pitié-Salpêtrière, Service de Biochimie Médicale, Paris, France.
Lambrozo
J
J
Touitou
Y
Y
D000328:Adult; D001683:Biological Clocks; D001786:Blood Glucose / Q000378:metabolism; D001798:Blood Proteins / Q000378:metabolism*; D002940:Circadian Rhythm / Q000502:physiology* / Q000528:radiation effects; D004573:Electrolytes / Q000097:blood*; D004574:Electromagnetic Fields; D004798:Enzymes / Q000097:blood*; D006801:Humans; D008055:Lipids / Q000097:blood*; D008074:Lipoproteins / Q000097:blood*; D008297:Male
D001786:Blood Glucose; D001798:Blood Proteins; D004573:Electrolytes; D004798:Enzymes; D008055:Lipids; D008074:Lipoproteins