Partial sleep restriction decreases insulin sensitivity in type 1 diabetes.
Level 3 - non-randomized controlled study
Within-subject crossover study; randomization order not specified in abstract
PubMed 20357381 · doi:10.2337/dc09-2317
What was done
Seven adults (3 men, 4 women; mean age 44 ± 7 years, BMI 23.5 ± 0.9 kg/m², HbA1c 7.6 ± 0.3%) with type 1 diabetes were evaluated in a within-subject crossover design. Each participant was tested after a night of normal sleep and after a night restricted to 4 hours of sleep, with sleep duration verified by polysomnography. Insulin sensitivity was evaluated using hyperinsulinemic-euglycemic clamp studies combined with [6,6-²H₂]glucose infusion to assess endogenous glucose production and peripheral glucose disposal.
What was found
Sleep duration was significantly shorter on the restriction night compared to the unrestricted night (222 ± 7.1 vs. 469 ± 8.5 minutes, P = 0.02). Sleep restriction did not alter basal glucose, basal nonesterified fatty acids (NEFAs), or endogenous glucose production. During the hyperinsulinemic clamp, endogenous glucose production remained unchanged (6.2 ± 0.8 vs. 6.9 ± 0.6 µmol · kg lean body mass⁻¹ · min⁻¹, not significant), and clamp NEFA levels were unaltered (143 ± 29 vs. 133 ± 29 µmol/L, not significant). However, sleep restriction significantly reduced the clamp glucose disposal rate (22.0 ± 2.1 vs. 25.5 ± 2.6 µmol · kg lean body mass⁻¹ · min⁻¹, P = 0.04) and reduced the required glucose infusion rate by approximately 21% (P = 0.04).
Why it matters
This study demonstrates that acute partial sleep deprivation induces peripheral insulin resistance in individuals with type 1 diabetes, mirroring effects previously established in healthy populations. It suggests that acute sleep variability can directly destabilize glycemic control and insulin requirements in type 1 diabetes.
Limits
The sample size is extremely small (n = 7). The study only tested a single night of sleep restriction, leaving chronic or cumulative sleep loss unaddressed. The abstract does not specify whether the order of sleep conditions was randomized, nor does it evaluate daytime physical activity, counter-regulatory hormones, or free-living glycemic variability.
Cited by
- partial Sleep studies show that experiencing a single bad night of sleep measurably increases insulin resistance over the subsequent 48 to 72 hours.