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Diabetologia. 2015 Apr;58(4):791-8. doi: 10.1007/s00125-015-3500-4. Epub 2015 Feb 22.

Sleep restriction increases free fatty acids in healthy men.

Author information

1
Diabetes and Obesity Research Institute, Cedars-Sinai Medical Center, 8700 Beverly Blvd, THA E104, Los Angeles, CA, 90048, USA, josiane@uchicago.edu.

Abstract

AIMS/HYPOTHESIS:

Sleep loss is associated with insulin resistance and an increased risk for type 2 diabetes, yet underlying mechanisms are not understood. Elevation of circulating non-esterified (i.e. free) fatty acid (NEFA) concentrations can lead to insulin resistance and plays a central role in the development of metabolic diseases. Circulating NEFA in healthy individuals shows a marked diurnal variation with maximum levels occurring at night, yet the impact of sleep loss on NEFA levels across the 24 h cycle remains unknown. We hypothesised that sleep restriction would alter hormones that are known to stimulate lipolysis and lead to an increase in NEFA levels.

METHODS:

We studied 19 healthy young men under controlled laboratory conditions with four consecutive nights of 8.5 h in bed (normal sleep) and 4.5 h in bed (sleep restriction) in randomised order. The 24 h blood profiles of NEFA, growth hormone (GH), noradrenaline (norepinephrine), cortisol, glucose and insulin were simultaneously assessed. Insulin sensitivity was estimated by a frequently sampled intravenous glucose tolerance test.

RESULTS:

Sleep restriction relative to normal sleep resulted in increased NEFA levels during the nocturnal and early-morning hours. The elevation in NEFA was related to prolonged nocturnal GH secretion and higher early-morning noradrenaline levels. Insulin sensitivity was decreased after sleep restriction and the reduction in insulin sensitivity was correlated with the increase in nocturnal NEFA levels.

CONCLUSIONS/INTERPRETATION:

Sleep restriction in healthy men results in increased nocturnal and early-morning NEFA levels, which may partly contribute to insulin resistance and the elevated diabetes risk associated with sleep loss.

Comment in

PMID:
25702040
PMCID:
PMC4358810
DOI:
10.1007/s00125-015-3500-4
[Indexed for MEDLINE]
Free PMC Article

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