( CHICAGO - Getting fewer hours of sleep ...)Insufficient Sleep Associated with Poorer Blood Glucose Control,Health

CHICAGO - Getting fewer hours of sleep or lower-quality sleep may be associated with poorer blood glucose control among African-Americans with diabetes//, according to an article in the September 18 issue of Archives of Internal Medicine, a theme issue on sleep.

Many individuals in modern society experience a chronic lack of adequate sleep, either because they voluntarily stay up late or because they have difficulty sleeping, according to background information in the article. Accumulating evidence suggests that restricting sleep may affect the ability of the body to process sugar (glucose) into energy, thereby increasing risk for the development of diabetes. Additional studies indicate that the reverse may be true, and that type 2 diabetes-which occurs when the body loses the ability to respond to the insulin that converts glucose into energy-may contribute to sleep problems.

Kristen L. Knutson, Ph.D., of the University of Chicago, and colleagues conducted a study of 161 African-Americans with type 2 diabetes, including 42 men and 119 women who had an average age of 57.3. During a 30- to 45-minute interview, participants answered questions about sleep quality and quantity, their diabetes and any complications, and whether or not they took insulin. Their waist-hip ratio was measured, and the patients reported their height and weight, from which body mass index (BMI) was calculated. Each individual was given a sleep quality score that ranged from zero to 21, with scores of greater than five indicating poor sleep quality. In addition, the researchers calculated a perceived sleep debt for each individual, described as the difference between the number of hours of sleep participants said they got on a typical weekday and the amount of sleep they said they wanted to get. Hemoglobin A 1c (HbA1c) levels, which measure the control of blood glucose over time, were obtained from patients' medical charts. A level of 7 percent or lower is the re
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