No effect of 8-week time in bed restriction on glucose tolerance in older long sleepers
MARK R. ZIELINSKI
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Search for more papers by this authorCHRISTOPHER E. KLINE
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Search for more papers by this authorDANIEL F. KRIPKE
Department of Psychiatry, University of California, San Diego, CA
Search for more papers by this authorSHAWN D. YOUNGSTEDT
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Department of Psychiatry, Dorn VA Medical Center, Columbia, SC, USA
Search for more papers by this authorMARK R. ZIELINSKI
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Search for more papers by this authorCHRISTOPHER E. KLINE
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Search for more papers by this authorDANIEL F. KRIPKE
Department of Psychiatry, University of California, San Diego, CA
Search for more papers by this authorSHAWN D. YOUNGSTEDT
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC
Department of Psychiatry, Dorn VA Medical Center, Columbia, SC, USA
Search for more papers by this authorSummary
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.
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