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Original Research
Circadian misalignment augments markers of insulin resistance and inflammation, independently of sleep loss
Rachel Leproult, Ulf Holmbäck and Eve Van Cauter
Diabetes 2014 Jan; DB_131546. https://doi.org/10.2337/db13-1546
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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, twenty-six healthy adults were studied using a parallel group design. Both interventions involved 3 inpatient days with 10-h bedtimes followed by 8 inpatient days of sleep restriction to 5 hours, either with fixed nocturnal bedtimes (circadian alignment) or with bedtimes delayed by 8.5 hours on 4 of the 8 days (circadian misalignment). Daily total sleep time during the intervention was nearly identical in the aligned and misaligned conditions (4h48min[5min] vs. 4h45min[6min]). In both groups, insulin sensitivity significantly decreased after sleep restriction, without compensatory increase in insulin secretion, and inflammation increased. In male participants exposed to circadian misalignment, both the reduction in insulin sensitivity and the increase in inflammation doubled, compared to those who maintained regular nocturnal bedtimes.

Circadian misalignment as occurs in shift work may increase diabetes risk and inflammation, independently of sleep loss.

  • Received October 8, 2013.
  • Accepted January 6, 2014.
  • © 2014 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

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Circadian misalignment augments markers of insulin resistance and inflammation, independently of sleep loss
Rachel Leproult, Ulf Holmbäck, Eve Van Cauter
Diabetes Jan 2014, DB_131546; DOI: 10.2337/db13-1546

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Circadian misalignment augments markers of insulin resistance and inflammation, independently of sleep loss
Rachel Leproult, Ulf Holmbäck, Eve Van Cauter
Diabetes Jan 2014, DB_131546; DOI: 10.2337/db13-1546
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© 2019 by the American Diabetes Association. Diabetes Print ISSN: 0012-1797, Online ISSN: 1939-327X.