Document Detail


Five-hour sleep restriction for 7 days increases subjective sleepiness.
MedLine Citation:
PMID:  17284888     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated the effects of a 5-h sleep restriction for 7 d on subjective sleepiness in an ambulatory condition by comparing them with baseline conditions consisting of an 8-h sleep for 7 consecutive days. Subjects were 13 healthy male students (mean age 21.1 yr). Each subject was required to get 8 h of sleep (baseline, from 2300 to 0700) for 7 d, and 5 h of sleep (sleep restriction, from 0100 to 0600) for 7 d in an ambulatory condition. The order of the two sleep schedules was randomly assigned. Subjective sleepiness was assessed by a Visual Analog Scale (VAS) every 3 h at 0900, 1200, 1500, 1800, and 2100 for 7 successive days during each sleep schedule. The VAS score during sleep restriction gradually increased up to the 5th day and then reached a plateau. The patterns of time-course changes in the VAS score were similar to those at baseline. The VAS scores showed a peak at 0900, taking a dip at 1200, and then gradually increasing toward 2100. The mean VAS score of the last three days of the 5-h sleep restriction was significantly higher than that at baseline (p<0.001). A 5-h sleep restriction for 7 d in an ambulatory condition increased subjective sleepiness up to the 5th day and then reached a plateau. The patterns of the time-course changes in sleepiness of 5-h sleep restriction per day did not differ from that at baseline.
Authors:
Fumio Kobayashi; Keiko Yamamoto; Hirohito Tsuboi; Reiko Hori; Misuzu Watanabe; Yasuhiro Akamatsu; Teruyuki Tomita
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Industrial health     Volume:  45     ISSN:  0019-8366     ISO Abbreviation:  Ind Health     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-02-07     Completed Date:  2007-03-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985065R     Medline TA:  Ind Health     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  160-4     Citation Subset:  IM    
Affiliation:
Aichi Medical University School of Medicine.
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MeSH Terms
Descriptor/Qualifier:
Adult
Circadian Rhythm
Fatigue*
Humans
Japan
Male
Sleep Deprivation*
Students, Medical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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