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Phase advance with separate and combined melatonin and light treatment.
MedLine Citation:
PMID:  21069516     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
INTRODUCTION: Melatonin and light treatment are recommended for hastening adaptation to time zone change. We evaluated an afternoon regimen of 3 mg sustained release (SR) melatonin with and without next morning green light treatment for circadian phase advance. Effects of melatonin and light were tested separately and then combined to determine if the total phase change is additive or synergistic.
MATERIAL AND METHODS: For each condition (melatonin, placebo, light, melatonin plus light), 11 subjects spent from Tuesday evening until Friday afternoon in the laboratory. For all four conditions, the following sleep schedule was maintained: night 1, 2345 to 0630 hours, night 2, 1600 to 0530 hours, and night 3, 2345 to 0700 hours. For the light-only condition, light treatment was administered between 0700 and 0800 hours on Thursday. For melatonin-only or placebo conditions, capsules were administered at 1600 hours on Wednesday. For the combined condition, melatonin was administered at 1600 hours on Wednesday with light treatment between 0600 and 0700 hours on Thursday. Circadian phase was assessed by calculating dim light melatonin onset (DLMO) from salivary melatonin, using a mean baseline +2 standard deviations (BL + 2 SD) threshold. For all four conditions, pre-treatment and post-treatment DLMO assessments were on Tuesday and Thursday evenings, respectively.
RESULTS: Phase advances were: melatonin at 1600 hours, 0.72 h p < 0.005, light treatment from 0700 to 0800 hours, 0.31 h, non-significant, and the combined treatment, 1.04 h p < 0.0002.
CONCLUSION: The phase advance from the combination of afternoon melatonin with next morning light is additive.
Authors:
Michel A Paul; Gary W Gray; Harris R Lieberman; Ryan J Love; James C Miller; Matthew Trouborst; Josephine Arendt
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Publication Detail:
Type:  Journal Article     Date:  2010-11-11
Journal Detail:
Title:  Psychopharmacology     Volume:  214     ISSN:  1432-2072     ISO Abbreviation:  Psychopharmacology (Berl.)     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7608025     Medline TA:  Psychopharmacology (Berl)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  515-23     Citation Subset:  IM    
Affiliation:
Defence Research & Development Canada, 1133 Sheppard Ave. West, P.O. Box 2000, Toronto, ON, Canada, M3M 3B9, michel.paul@drdc-rddc.gc.ca.
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