Selective slow wave sleep but not rapid eye movement sleep suppression impairs morning glucose tolerance in healthy men.
Level 2 - randomized trial
Individual randomized crossover trial
PubMed 23602132 · doi:10.1016/j.psyneuen.2013.03.018
What was done
Sixteen healthy men completed three experimental conditions in a crossover design: selective slow wave sleep (SWS) suppression, rapid eye movement (REM) sleep disturbance, and regular sleep. Selective sleep stage disruption was delivered using an acoustic tone (532 Hz) with gradually rising sound intensity. Morning glucoregulatory parameters were assessed via an oral glucose tolerance test (OGTT).
What was found
Selective SWS suppression significantly increased morning plasma glucose and serum insulin responses, reducing postprandial insulin sensitivity by up to 20% as measured by the Matsuda Index. Disturbed REM sleep did not affect morning glucose homeostasis. Specific baseline and post-intervention concentrations, standard deviations, and exact p-values were not provided in the abstract.
Why it matters
This study demonstrates that the acute metabolic disruption associated with poor sleep is stage-specific, implicating slow wave sleep deprivation rather than general sleep fragmentation or REM loss as the primary driver of impaired glucose tolerance.
Limits
The trial had a very small sample size (n = 16) and included only healthy men, limiting generalizability to women, older adults, or clinical populations. Only acute next-morning responses were evaluated, leaving long-term metabolic adaptations unmeasured.
Cited by
- supports Selective suppression of deep slow-wave sleep using acoustic stimuli, without altering total sleep duration, induces impaired glucose tolerance.