title: Circadian adjustment and stress in operators under fast rotating 12-hour shifts.
abstract: The aim of the investigation was to follow the time-of-day variations of some circadian and stress indicators during fast rotating 12-hour shifts. The study covered twenty-one male operators in thermoelectric power plant aged 35.7 +/- 8.5 years. The time-of-day variations of 6-sulphathoxymelatonin (aMT6s), the main melatonin metabolite, 11-oxycorticosteroids (11-OCS), catecholamines and oral temperature were followed during the 2nd day shift and two consecutive night shifts. The aMT6s was determined by RIA and the 11-OCS and catecholamines by fluoriphotometric methods. Moderate general activation and daily oriented circadian rhythms of aMT6s, 11-OCS and oral temperature were found in the investigated operators. The night shiftwork showed significant impact on melatonin peak values at fast rotating 12-hour shiftwork.
authors: Department of Physiology, Psychology and Ergonomics, National Center of Hygiene, Medical Ecology and Nutrition, 15 Dimiter Nestorov Boul., 1431 Sofia, Bulgaria.
authors: K
authors: K
authors: Vangelova
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D000704:Analysis of Variance; D001831:Body Temperature; D002395:Catecholamines / Q000652:urine; D002940:Circadian Rhythm; D006801:Humans; D006854:Hydrocortisone / Q000652:urine; D008297:Male; D008550:Melatonin / Q000652:urine; D010561:Personnel Staffing and Scheduling; D011210:Power Plants; D013312:Stress, Physiological / Q000503:physiopathology* / Q000652:urine
chemical_list: D002395:Catecholamines; D008550:Melatonin; D006854:Hydrocortisone