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 I-125 radioimmunoassay. The rats were exposed to 5 and 500 mu T flux density for 24 h. The excretion of urinary aMT6s did not show significant changes during or after magnetic field exposure. (C) 1995 Wiley-Liss, Inc.