Sinusoidal 50 Hz 500 μT magnetic field has no acute effect on urinary 6‐sulphatoxymelatonin in wistar rats

The effect of a 50 Hz, vertical magnetic field on the excretion of urinary 6‐sulphatoxymelatonin (aMT6s) of male and female Wistar rats was studied in a self‐controlled experiment. Twenty rats were kept in metabolic cages under 9:15 h light:dark conditions. The urine of the animals was collected twice per day for 5 consecutive days. The concentration of aMT6s in the rat urine was measured by 125 I radioimmunoassay. The rats were exposed to 5 and 500 μT flux density for 24 h. The excretion of urinary aMT6s did not show significant changes during or after magnetic field exposure. © 1995 Wiley‐Liss, Inc.