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  • Title: The effect of bright light on physiological circadian rhythms and subjective alertness of shift work nurses in Iran.
    Author: Kakooei H, Ardakani ZZ, Ayattollahi MT, Karimian M, Saraji GN, Owji AA.
    Journal: Int J Occup Saf Ergon; 2010; 16(4):477-85. PubMed ID: 21144266.
    Abstract:
    In this study, the effects of bright light (BL) on the rhythms in body temperature, plasma melatonin, plasma cortisol and subjective alertness, in 34 shift work nurses at a university hospital were assessed. They were exposed to very BL (4,500 lx) during 2 breaks (21:15-22:00 and 3:15-4:00) or dim light (300 lx). The subjects were studied under 24 h of realistic conditions during which their plasma cortisol and melatonin were measured at 3-h intervals; their body temperature was also measured during and after night shift work. Subjective alertness was evaluated with the Karolinska sleepiness scale. Administration of BL significantly suppressed night-time melatonin levels. A one-way ANOVA revealed that BL tended to increase cortisol levels and body temperature and significantly improved alertness. These results demonstrate that photic stimulation in a hospital setting can have a powerful influence on the adjustment of the circadian system.
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