(HealthDay News) – Short sleep durations do not lead to increased insulin resistance.
Marie-Pierre St-Onge, PhD, from St. Luke’s/Roosevelt Hospital in New York City, and colleagues conducted a randomized crossover study in which 27 normal-weight 30- to 45-year-old adults who habitually slept seven to nine hours a night were studied under a short (four hours in bed) or habitual (nine hours in bed) sleep condition. For each four-day study period, a controlled diet was provided and fasting blood samples were obtained daily.
The researchers found that body weights were significantly reduced by 2.2 ± 0.4lbs and 1.7 ± 0.4lbs during the habitual and short-sleep phases, respectively. Sleep duration had no effect on glucose, insulin, and leptin profiles. There were sex differences in ghrelin and glucagon-like peptide 1 (GLP-1) responses. Fasting (P=0.054) and morning (08:00–12:00) (P=0.042) total ghrelin increased during the short-sleep phase in men but not women. For GLP-1, the reverse was seen, with afternoon levels (12:30–19:00) lower (P=0.016) in women but not men after short-sleep periods compared with habitual sleep.
“These data suggest that, in the context of negative energy balance, short sleep does not lead to a state of increased insulin resistance, but may predispose to overeating via separate mechanisms in men and women,” the authors write.