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Napping Increases Risk of Type 2 Diabetes in Older Adults
Frequent napping isn´t always a
good thing as it increases the risk
of type 2 diabetes; © SXC
A study shows that frequent napping is associated with an elevated prevalence of type 2 diabetes and impaired fasting glucose in an older Chinese population.
This cross-sectional study analyzed baseline data from the Guangzhou Biobank Cohort Study, a collaboration between the Guangzhou Number 12 People's Hospital and the Universities of Birmingham and Hong Kong. The community-based study took place in Guangzhou, China, where 19,567 participants between the ages of 50 and 93 years were recruited from 2003 to 2004 and 2005 to 2006. The sample comprised 13,972 women with a mean age of 61.4 years and 5,595 men with an average age of 64.2 years.
Participants underwent a half-day assessment, which included a structured interview on lifestyle and medical history, and a physical examination. Self-reported frequency of napping was obtained by questionnaire, and type 2 diabetes was assessed by a fasting blood glucose sample and/or self-reports of physician diagnosis or treatment. Participants were asked to describe their napping habits and daytime sleepiness.
Results show that the prevalence of type 2 diabetes was 36 percent higher in participants who reported napping four to six times a week and 28 percent higher in those who napped daily. Similar associations were found between napping and impaired fasting glucose.
Lead author Neil Thomas, reader in epidemiology at the University of Birmingham, U.K., said that additional research is needed to determine if napping itself plays a causative role in the development of type 2 diabetes, or if other factors are involved.
"In many non-Mediterranean, Western countries a large proportion of those that nap are generally older or have other conditions that cause tiredness and create an urge to nap," said Thomas. "The napping can therefore be a marker of disease."
The authors noted that the association between napping and diabetes was observed despite the fact that nappers had higher levels of physical activity, which has been shown to reduce the risk of diabetes. This suggests that the relationship between napping and diabetes might have been stronger had it not been offset by the protective effects of physical activity. The authors added that there will be profound public health implications in China if the relationship between napping and increased risk of type 2 diabetes is confirmed in longitudinal studies, as the nation is currently affected by an emerging diabetes epidemic.
REHACARE.de; Source: American Academy of Sleep Medicine
- More about the American Academy of Sleep Medicine at www.aasmnet.org
( Source: REHACARE.de )