Urinary6-OHMS in morning samples is an indicator of night-time melatonin production. Urine was collected twice on friday and the following monday (interruption of occupational exposure). Exposure was monitored for three complete work shifts in 59 workers using personal exposure meters. Workers were classified as "low exposed" (< or = 0.2 µT) or "higher exposed" (> 0.2 µT).
The meters were worn on the hip in a belted pouch. During the sleep, subjects were instructed to leave the meter beside the bed, close to the body, but not near electrical and electronic devices.
Additional info
59 workers, 26 men and 33 women, engaged in different occupations were included in the study: 26 in clothing production, 14 in local utility company, 6 primary school teachers, 5 in engineering industry and a further 8 in other occupations. Morning urine samples were collected twice: 1) on Friday after 4 days of occupational exposure or 2) on Monday after 2 days of no occupational exposure.
Ministero del Lavoro e delle Politiche Sociali (Ministry of Labour and Social Policies), Italy
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