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Efficacy of Melatonin Treatment in Jet Lag, Shift Work, and Blindness
Josephine Arendt
School of Biological Sciences, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
Debra J. Skene
School of Biological Sciences, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
Benita Middleton
School of Biological Sciences, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
Steven W. Lockley
School of Biological Sciences, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
Stephen Deacon
School of Biological Sciences, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
Melatonin has chronobiotic properties in humans. It is able to phase shift strongly endogenous rhythms, such as core temperature and its own endogenous rhythm, together with the sleep-wake cycle. Its ability to synchronize free-running rhythms has not been fully investigated in humans. There is evidence for synchronization of the sleep-wake cycle, but the available data suggest that it is less effective with regard to endogenous melatonin and core temperature rhythms. When suitably timed, most studies indicate that fast release preparations are able to hasten adaptation to phase shift in both field and simulation studies of jet lag and shift work. Both subjective and objective measures support this statement. However, not all studies have been successful. Careful evaluation of the effects on work-related performance is required. When used to alleviate the non-24-h sleep-wake disorder in blind subjects, again most studies report a successful outcome using behavioral measures, albeit in a small number of individuals. The pres suggest, however, that although leep-wake can be stabilized to 24 h, entrainment of other rhythms is exceptionally rare.
Key Words: melatonin • rhythm • light • shift work • jet lag • blindness
Journal of Biological Rhythms, Vol. 12, No. 6,
604-617 (1997)
DOI: 10.1177/074873049701200616
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