Linked Life Data

9688873

Source:http://linkedlifedata.com/resource/pubmed/id/9688873

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1 Pt 1
pubmed:dateCreated
1998-8-25
pubmed:abstractText
To investigate the adaptation of melatonin secretion to an abrupt time shift and the effects of sleep facilitation with a hypnotic, eight subjects were submitted to an 8-h advance shift achieved by advancing bedtimes from 2300-0700 to 1500-2300. Each subject participated in two studies (i.e., placebo and zolpidem). Each study included a baseline period with dim light during waking hours and 2300-0700 bedtimes in total darkness. Blood samples for determination of plasma melatonin were obtained at 20-min intervals for 68 h. Advanced exposure to sleep and darkness resulted in a nearly 2-h advance of melatonin onset, which appeared within 6 h after lights-out during the first shifted night, and an almost 1-h advance of the melatonin offset. No further adaptation occurred during the second shifted sleep period. Zolpidem had no beneficial effects on the adaptation of the melatonin profile. There was no relationship between sleep parameters and the magnitude of the melatonin shifts. Thus the overall advance of melatonin profiles was primarily achieved during the initial exposure to an 8-h period of darkness. The present data suggest that exposure to dark affects human circadian phase.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
275
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
E48-54
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Rapid phase advance of the 24-h melatonin profile in response to afternoon dark exposure.
pubmed:affiliation
Department of Medicine, University of Chicago, Chicago, Illinois 60637, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't