DAHLGREN K. TemporaJ patterns lin psychophysiological activa-tion ,in :rotating shift worlkers -A fol1ow-UJP :Ilield ;study ,one Y1e<l!r after an lincrease 'in nighlttime work. Scand j work environ health 7 (1981) 131-140. The study conce:rned the long-term effects 'of ,a wee~ly rotalting d<l!y-night shirt sohedu!le on circadi'an j)un~tions. U was performed 1 a after the inltr'oduction of an inc'Dease in nighttime WOIrk and was a follow-up of a study performed one month after the change in

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... ours. Fourteen male typesetters were observed in connection with the first, fourth and seventh nightshifts of the "night week" and the two dayshifts of the "day week." Measurements were taken of body temperature and self-rated activation during awake periods, of adrenO!line excretion during worlk and Sleep, and lof choirce~reaction time during work. The resuhts showed thaJt a different ,pa:btern of var:ialtion ,in circadian functions was present 1 a after the increase in n~ghttime work when C'ompaIred to ,the pattern one month after the increase. The change in pattern consisted mainly of a general flattening of the curves during both day and night work, although some changes from the beginning~o the end of the ni.ghtshift week C'ouQd stiJJl be noticed.