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Harris, Anette; Waage, Siri; Ursin, Holger; Eriksen, Hege R. (2012)
Publisher: Co-Action Publishing
Journal: International Journal of Circumpolar Health
Languages: English
Types: Article
Subjects: cortisol, diurnal rhythm, extreme environment
Objectives. The aim was to investigate how working in an extreme and isolated environment in the Arctic affected the diurnal rhythm of saliva cortisol. Study design. Field study. Methods. Twenty-five male tunnel workers were screened during 3 different working cycles with different light conditions during a 9-month construction period; April/May (24 hours [h] light), September/October (approximately 12 h light and 12 h darkness) and November/December (24 h darkness). The work schedule was 10 h on/14 h off, 21 days at work/21 days off work. The workers alternated between the day shift in 1 work period and the night shift in the next. Four saliva samples were collected on day 14 in all 3 periods; immediately after awakening, and then 30 minutes, 6 hours and 12 hours after awakening. Results. Regardless of shift schedule, the workers’ cortisol levels were significantly lower in the period with 24 hours of light per day compared to the period with “normal” light conditions. There were no differences in the cortisol levels of the workers on night shifts in the period with 24 hours of darkness compared to those in the period with “normal” light conditions, but the workers who were on day shifts in the period with 24 of hours darkness had a disturbed cortisol rhythm (lower peak after awakening and lack of the normal decrease during the day). Conclusions. External light conditions and shift schedule were important factors in regulating the workers’ cortisol rhythm. It seems to be easier to adapt to a night rhythm than an early morning rhythm in an isolated and extreme environment.(Int J Circumpolar Health 2011; 70(5):542-551)Keywords: cortisol, diurnal rhythm, extreme environment
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    • 1. Czeisler CA, Kronauer RE, Allan JS, Duffy JF, Jewett ME, Brown EN, et al. Bright light induction of strong (type 0) resetting of the human circadian pacemaker. Science 1989;244(4910):1328-1333.
    • 2. Bjorvatn B, Pallesen S.A practical apporach to circadian rhythm sleep disorders. Sleep Med Rev 2009;13(1): 47- 60.
    • 3. Palinkas LA, Suedfeld P. Psychological effects of polar expeditions. Lancet 2008;371(9607):153-163.
    • 4. Harris A, Marquis P, Eriksen HR, Grant I, Corbett R, Lie SA, Ursin H. Diurnal rhythm in British Antarctic personnel. Rural Remote Health 2010;10(2):1351.
    • 5. Born J, Fehm HL.The neuroendocrine recovery function of sleep. Noise Health 2000;2(7):25-38.
    • 6. Wilhelm I, Born J, Kudielka BM, Schlotz W,Wüst S. Is the cortisol awakening rise a response to awakening? Psychoneuroendocrinology 2007;32(4):358-366.
    • 7. Kirschbaum C, Hellhammer DH. Salivary cortisol in psychoneuroendocrine research: recent developments and applications. Psychoneuroendocrinology 1994;19(4): 313-333.
    • 8. Pruessner JC,Wolf OT, Hellhammer DH, Buske-Kirschbaum A, von Auer K, Jobst S, et al. Free cortisol levels after awakening: a reliable biological marker for the assessment of adrenocortical activity. Life Sci 1997;61(26): 2539-2549.
    • 9. Harris A,Waage S, Ursin H, Hansen AM, Bjorvatn B, Eriksen HR. Cortisol, reaction time test and health among offshore shift workers. Psychoneuroendocrinology 2010; 35(9):1339-1347.
    • 10. Costa G.The impact of shift and night work on health. Applied ergonomics 1996;27(1):9-16.
    • 11. Pilcher JJ, Lambert BJ, Huffcutt AI. Differential effects of permanent and rotating shifts on self-report sleep length: a meta-analytic review. Sleep 2000;23(2):155- 163.
    • 12. Barnes RG, Deacon SJ, Forbes MJ,Arendt J.Adaptation of the 6-sulphatoxymelatonin rhythm in shiftworkers on offshore oil installations during a 2-week 12-h night shift. Neurosci Lett 1998;241(1):9-12.
    • 13. Bjorvatn B, Stangenes K, Oyane N, Forberg K, Lowden A, Holsten F, et al. Subjective and objective measures of adaptation and readaptation to night work on an oil rig in the North Sea. Sleep 2006;29(6):821-829.
    • 14. Waage S, Odeen M, Bjorvatn B, Eriksen HR, Ursin H, Hollund BE, et al. Still healthy after extended work hours? Ten hours shift, twenty-one days working period for tunnel workers. Industrial health 2010;48(6):804- 810.
    • 15. Forberg K, Waage S, Moen B, Bjorvatn B. Subjective and objective sleep and sleepiness among tunnel workers in an extreme and isolated environment: 10-h shifts, 21-day working period, at 78 degrees north. Sleep Med 2010;11(2):185-190.
    • 16. Czeisler CA, Duffy JF, Shanahan TL, Brown EN, Mitchell JF, Rimmer DW, et al. Stability, precision, and near24-hour period of the human circadian pacemaker. Science 1999;284(5423):2177-2181.
    • 17. Kudielka BM, Kirschbaum C. Awakening cortisol responses are influenced by health status and awakening time but not by menstrual cycle phase. Psychoneuroendocrinology 2003;28(1):35-47.
    • 18. Edwards S, Evans P, Hucklebridge F, Clow A. Association between time of awakening and diurnal cortisol secretory activity. Psychoneuroendocrinology 2001;26 (6):613-622.
    • 19. Federenko I, Wüst S, Hellhammer DH, Dechoux R, Kumsta R, Kirschbaum C. Free cortisol awakening responses are influenced by awakening time. Psychoneu - roendocrinology 2004;29(2):174-184.
    • 20. Kunz-Ebrecht SR, Kirschbaum C, Marmot M, Steptoe A. Differences in cortisol awakening response on work days and weekends in women and men from the Whitehall II cohort. Psychoneuroendocrinology 2004; 29(4):516-528.
    • 21. Williams E, Magid K, Steptoe A. The impact of time of waking and concurrent subjective stress on the cortisol response to awakening. Psychoneuroendocrinology 2005;30(2):139-148.
    • 22. Kumari M, Badrick E, Ferrie J, Perski A, Marmot M, Chandola T. Self-reported sleep duration and sleep disturbance are independently associated with cortisol secretion in the Whitehall II study. J Clin Endocrinol Metab 2009;94(12):4801-4809.
    • 23. Hsiao FH,Yang TT, Ho RT, Jow GM, Ng SM, Chan CL, Lai YM, Chen YT, Wang KC. The self-perceived symptom distress and health-related conditions associated with morning to evening diurnal cortisol patterns in outpatients with major depressive disorder. Psychoneuroendocrinology 2010;35(4):503-515.
    • 24. Kennaway DJ, Van Dorp CF. Free-running rhythms of melatonin, cortisol, electrolytes, and sleep in humans in Antarctica.Am J Physiol 1991;260(6 pt 2):R1137-1144.
    • 25. Griftfihs PA, Folkard S, Bojkowski C, English J, Arendt J. Persistent 24-h variations of urinary 6-hydroxy melatonin sulphate and cortisol in Antarctica. Experientia 1986;42(4):430-432.
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