No effect of 8-week time in bed restriction on glucose tolerance in older long sleepers

Mark R. Zielinski, Christopher E. Kline, Daniel F. Kripke, Richard K. Bogan, Shawn D. Youngstedt

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The aim of this study was to investigate the effects of 8 weeks of moderate restriction of time in bed (TIB) on glucose tolerance and insulin sensitivity in healthy older self-reported long sleepers. Forty-two older adults (ages 50-70 years) who reported average sleep durations of ≥8.5 h per night were assessed. Following a 2-week baseline, participants were randomly assigned to two 8-week treatments: either (i) TIB restriction (n = 22), which involved following a fixed sleep schedule in which time in bed was reduced by 90 min compared with baseline; (ii) a control (n = 18), which involved following a fixed sleep schedule but no imposed change of TIB. Sleep was monitored continuously via wrist actigraphy recordings, supplemented with a daily diary. Glucose tolerance and insulin sensitivity were assessed before and following the treatments. Compared with the control treatment, TIB restriction resulted in a significantly greater reduction of nocturnal TIB (1.39 ± 0.40 h versus 0.14 ± 0.26 h), nocturnal total sleep time (TST) (1.03 ± 0.53 h versus 0.40 ± 0.42 h), and 24-h TST (1.03 ± 0.53 h versus 0.33 ± 0.43 h) from baseline values. However, no significant effect of TIB restriction was found for glucose tolerance or insulin sensitivity. These results suggest that healthy older long sleepers can tolerate 8 weeks of moderate TIB restriction without impairments in glucose tolerance or insulin sensitivity.

Original languageEnglish (US)
Pages (from-to)412-419
Number of pages8
JournalJournal of Sleep Research
Volume17
Issue number4
DOIs
StatePublished - Dec 2008
Externally publishedYes

Keywords

  • Glucose tolerance
  • Insulin sensitivity
  • Long sleep
  • Older adults
  • Sleep deprivation
  • Sleep restriction

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Behavioral Neuroscience

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