Long Daytime Napping Is Associated with Increased Adiposity and Type 2 Diabetes in an Elderly Population with Metabolic Syndrome

Research examining associations between objectively-measured nappingtime and type 2 diabetes (T2D) is lacking. This study aimed to evaluate daytime nappingin relation to T2D and adiposity measures in elderly individuals from the Mediterranean region. A cross-sectional analysis of baseline data from 2190 elderly participants with overweight/obesity and metabolic syndrome, in the PREDIMED-Plus trial, was carried out. Accelerometer-derived nappingwas measured. Prevalence ratios (PR) and 95% confidence intervals (CI) for T2D were obtained using multivariable-adjusted Cox regression with constant time. Linear regression models were fitted to examine associations of nappingwith body mass index (BMI) and waist circumference (WC). Participants napping≥90 min had a higher prevalence of T2D (PR 1.37 (1.06, 1.78)) compared with those napping5 to <30 min per day. Significant positive associations with BMI and WC were found in those participants napping≥30 min as compared to those napping5 to <30 min per day. The findings of this study suggest that longer daytime nappingis associated with higher T2D prevalence and greater adiposity measures in an elderly Spanish population at high cardiovascular risk.