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Circadian misalignment augments markers of insulin resistance and inflammation, independently of sleep loss.

Authors
Leproult-R; Holmbäck-U; Van Cauter-E
Source
Diabetes 2014 Jun; 63(6):1860-1869
NIOSHTIC No.
20045077
Abstract
Shift workers, who are exposed to irregular sleep schedules resulting in sleep deprivation and misalignment of circadian rhythms, have an increased risk of diabetes relative to day workers. In healthy adults, sleep restriction without circadian misalignment promotes insulin resistance. To determine whether the misalignment of circadian rhythms that typically occurs in shift work involves intrinsic adverse metabolic effects independently of sleep loss, a parallel group design was used to study 26 healthy adults. Both interventions involved 3 inpatient days with 10-h bedtimes, followed by 8 inpatient days of sleep restriction to 5 h with fixed nocturnal bedtimes (circadian alignment) or with bedtimes delayed by 8.5 h on 4 of the 8 days (circadian misalignment). Daily total sleep time (SD) during the intervention was nearly identical in the aligned and misaligned conditions (4 h 48 min [5 min] vs. 4 h 45 min [6 min]). In both groups, insulin sensitivity (SI) significantly decreased after sleep restriction, without a compensatory increase in insulin secretion, and inflammation increased. In male participants exposed to circadian misalignment, the reduction in SI and the increase in inflammation both doubled compared with those who maintained regular nocturnal bedtimes. Circadian misalignment that occurs in shift work may increase diabetes risk and inflammation, independently of sleep loss.
Keywords
Sleep-deprivation; Sleep-disorders; Shift-work; Shift-workers; Circadian-rhythms; Risk-factors; Blood-sugar-disorders; Metabolism; Biomarkers; Cardiovascular-disease; Cardiovascular-function; Humans; Immune-reaction; Physiopathology
Contact
Rachel Leproult, Sleep Metabolism and Health Center, Department of Medicine, University of Chicago, Chicago, IL.
CODEN
DIAEAZ
Publication Date
20140601
Document Type
Journal Article
Email Address
rleproult@gmail.com
Funding Type
Grant
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-009482; M092014
Issue of Publication
6
ISSN
0012-1797
Source Name
Diabetes
State
IL
Performing Organization
University of Chicago
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