Sleep Duration and Waist Circumference in Adults: A Meta-Analysis

Area of Science:

• Sleep science
• Obesity research
• Public health

Background:

• Previous research indicates a link between insufficient sleep and overall obesity.
• Waist circumference (WC) is a crucial measure for predicting health risks associated with central adiposity.
• Existing studies on the relationship between sleep duration and WC in adults have produced conflicting results.

Purpose of the Study:

• To quantitatively assess the relationship between insufficient sleep and waist circumference.
• To evaluate the consistency of findings regarding sleep duration and central adiposity.

Main Methods:

• A systematic literature search was conducted across major academic databases (Google Scholar, Medline, PubMed, PsycINFO) up to July 2013.
• Included studies involved adult human subjects with measured sleep duration and waist circumference.
• A random-effects meta-analysis and regression analyses were performed on 21 studies (56,259 participants).

Main Results:

• A significant negative correlation (r = -0.10, P < 0.0001) was found between sleep duration and waist circumference.
• This indicates that shorter sleep durations are associated with larger waist circumferences.
• No significant moderators were identified, and funnel plots suggested no publication bias.

Conclusions:

• Cross-sectional data internationally confirm a significant association between reduced sleep duration and increased central adiposity (waist circumference).
• The findings highlight the importance of adequate sleep for maintaining healthy body composition.
• Future research should incorporate prospective study designs to establish causality.