ObjectiveThe study examines the implications for shiftworkers of applying different numbers of teams in the organization of shiftwork. MethodsThe participating operators came from five different companies applying continuous shift rotation systems. The companies shared the same product organization and a common corporate culture belonging to the same multinational company. Each company had a shift system consisting of four, five or six teams, with the proportion of shifts outside day work decreasing as the number of teams increased. Questionnaire and documentary data were used as data sources. ResultsOperators in systems with additional teams had more daywork but also more irregular working hours due to both overtime and schedule changes. Operators using six teams used fewer social compensation strategies. Operators in four teams were most satisfied with their work hours. Satisfaction with the time available for various social activities outside work varied inconsistently between the groups. Conclusions In rotating systems the application of more teams reduces the number of shifts outside day work. This apparent improvement for shiftworkers was counteracted by a concomitant irregularity produced by greater organizational requirements for flexibility. The balance of this interaction was found to have a critical impact on employees. Resumo Objetivo

<strong><span style="font-family: TimesNewRomanPS-BoldMT;"><span style="font-family: TimesNewRomanPS-BoldMT;"><p align="left"> </p></span></span><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;">SAMMENDRAG</span></span></strong><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><p align="left">I denne studien har vi undersøkt om det finnes noen sammenheng mellom målte verdier av urinmetabolitten</p><p align="left">6-sulfatoxymelatonin (aMT6s) tatt ut i porsjoner gjennom døgnet og selvrapportert døgnrytme hos en</p><p align="left">gruppe norske skiftarbeidere. Studien omfatter 19 arbeidstakere ved to produksjonsenheter ved Hydro</p><p align="left">Porsgrunn, magnesiumfabrikken og fullgjødselfabrikk 3. Etter å ha deltatt i en studie der urinprøver ble</p><p align="left">samlet inn, svarte de involverte senere på et spørreskjema om søvn og døgnrytme. Resultatene indikerer at</p><p align="left">egenrapporterte B-type mennesker har en tendens til høyere midlere timeutskillelse av aMT6s analysert på</p><p align="left">døgnbasis første døgn med nattskift, og en signifikant høyere nattutskillelse (8 timer) i et kontrolldøgn</p><p align="left">hjemme. I fremtidige studier av melatoninsekresjon og utskillelse av metabolitt i urin, kan det være av</p><p align="left">interesse samtidig å samle inn spørreskjemabaserte opplysninger om døgnrytmetype og utfyllende opplysninger</p><p align="left">om søvn og søvnmønster i relasjon til eksponeringer som skiftarbeid og andre arbeidsmiljøfaktorer</p><p align="left">som kan ha effekt på hormonbalansen.</p><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><p align="left">Tynes T, Haugsdal B, Tønnessen A, Kleiven M.</p></span></span></span><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><p align="left"> </p></span></span><p align="left"><strong><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;">Individual variations in excretion of<p align="left">6-sulfatoxymelatonin in morning and evening type Norwegian shift workers.</p></span></span></strong><em><span style="font-size: x-small; font-family: TimesNewRomanPS-ItalicMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-ItalicMT;"><em><span style="font-size: x-small; font-family: TimesNewRomanPS-ItalicMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-ItalicMT;"><p align="left">Nor J Epidemiol</p></span></span></em></span><em><span style="font-size: x-small; font-family: TimesNewRomanPS-ItalicMT;"><p align="left"> </p></span></em></span><strong><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;">ENGLISH SUMMARY</span></span></strong><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><p align="left">The aim of this study was to evaluate whether there is an association between measured values of the urine</p><p align="left">metabolite 6-sulfatoxymelatonin (aMT6s) in samples collected at selected intervals and self-reported diurnal</p><p align="left">rhythm in a group of Norwegian shift workers. The study included 19 workers at two production units</p><p align="left">at Hydro Porsgrunn, the magnesium factory and fertiliser factory 3. After submitting the urine samples</p><p align="left">used for the study, subjects filled in a questionnaire on sleep and diurnal rhythm at a later date. The results</p><p align="left">indicate that self-reported evening type subjects have a tendency towards a higher mean hourly aMT6ssecretion</p><p align="left">first day on night shift, and a significantly higher night secretion (8 hours) analysed for a control</p><p align="left">day at home. In future studies on secretion of melatonin and its metabolite in urine, the collection of</p><p align="left">questionnaire-based information on diurnal type, sleep and sleep pattern in relation to exposures like shift</p><p>work, and other work-related factors with potential effect on hormone balance might be of interest.</p></span></span></em><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;">1999; </span></span><strong><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;">9 </span></span></strong><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;">(1): 33-38.</span></span></p>

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