Effects of Sleep Duration and Architecture on Insulin Sensitivity
This pilot clinical trial will test the hypotheses that sleep restriction (for 5 nights), in comparison to "normal sleep", will:
- Decrease peripheral insulin sensitivity and glucose tolerance, as measured by the hyperinsulinemic-euglycemic clamp and oral glucose tolerance test.
- Decrease hepatic insulin sensitivity, as assessed by stable isotope studies of endogenous glucose production, gluconeogenesis and glycogenolysis.
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Official Title:||Effects of Sleep Duration and Architecture on Insulin Sensitivity|
- Insulin sensitivity [ Time Frame: 1 month ] [ Designated as safety issue: No ]Peripheral insulin sensitivity will be measured using the hyperinsulinemic-euglycemic clamp. Hepatic insulin sensitivity will be measured using stable isotope tracer studies.
|Study Start Date:||May 2011|
|Estimated Study Completion Date:||May 2013|
|Estimated Primary Completion Date:||December 2012 (Final data collection date for primary outcome measure)|
Experimental: sleep restriction
The investigators will compare the effects of sleep restriction vs. normal sleep in healthy volunteers, using a randomized crossover study design. Each subject will undergo a period of normal sleep and a period of sleep restriction, separated by a 1-month washout period. Subjects will be randomized to receive either sleep restriction first (later followed by normal sleep) or normal sleep first (later followed by sleep restriction).
Behavioral: Sleep restriction
Sleep restriction will consist of 5 nights, sleeping 4 hours per night Normal sleep will consist of 5 nights, sleeping 9 hours per night
Other Name: sleep restriction
Over the past 50 years, the incidence of diabetes has increased dramatically, while sleep duration in the US has decreased significantly. Epidemiological studies and small clinical trials suggest that these trends are causally related. In this study, our goal is to determine the mechanisms by which decreased sleep duration directly affects insulin sensitivity. The investigators will perform a clinical study in 20 healthy volunteers to determine whether 5 nights of sleep restriction decreases insulin sensitivity in the peripheral tissues (ie, skeletal muscle) or liver.
Peripheral insulin sensitivity will be measured by the hyperinsulinemic-euglycemic clamp, and hepatic insulin sensitivity will be quantified by measurement of hepatic glucose production, gluconeogenesis and glycogenolysis (using stable isotope tracer methods). Subjects will be randomized to an initial period of "normal sleep" or sleep restriction and will be admitted to the Clinical Research Center (CRC) for 9 days to undergo comprehensive metabolic studies and sleep assessments under the assigned sleep condition. After a 1-month washout period, subjects will be re-admitted to the CRC to undergo these same assessments under the opposite sleep condition.
|United States, California|
|UCSF San Francisco General Hospital||Recruiting|
|San Francisco, California, United States, 94110|
|Contact: Madhu N. Rao, MD 415-206-6381 firstname.lastname@example.org|
|Principal Investigator: Madhu N. Rao, MD|
|Principal Investigator:||Madhu N. Rao, MD||University of California, San Francisco|