Longer sleep tied to better metabolic profile
Longer sleep duration is positively associated with better metabolic profiles, a new study has shown. On the other hand, there is no direct correlation between sleep duration and dietary intake.
Analysis of sleep data of 1,615 adults showed that sleep duration was not significantly associated with energy (p=0.84), carbohydrate (p=0.66), fat (p=0.86) or protein (p=0.77) intake after adjusting for body mass index (BMI).
In contrast, an additional hour of sleep was significantly associated with a 0.03-mmol/L (95 percent CI, 0.00 to 0.05; p=0.03) increase in high-density lipoprotein cholesterol (HDL) after adjusting for smoking, socioeconomic status, age, sex and ethnicity.
Additionally, an additional hour of sleep was significantly associated with 0.46-kg/m2 (-0.69 to -0.24; p<0.001) and 0.9-cm (-1.5 to -0.3; p=0.004) reductions in BMI and waist circumference, respectively.
In the unadjusted model, an additional hour of sleep was also significantly associated with a decrease of 0.07 mmol/L (-0.13 to 0.01 mmol/L; p=0.02) in triglyceride levels and of 0.13 (-0.25 to 0.00; p=0.05) in C-reactive protein (CRP) levels.
Sleep duration showed moderate negative associations with levels of fasting glucose (p=0.77), HbA1c (p=0.18), CRP (p=0.85), triglycerides (p=0.38) and free triiodothyronine (p=0.66) after adjusting for BMI, ethnicity, smoking, sex, age and socioeconomic status.
Study participants were enrolled in the National Diet and Nutrition Survey Rolling Programme (NDNS-RP) in the UK study. Those who were pregnant and who had incomplete sleep data were excluded.
Of the participants, 24.8 percent were current smokers, 20.5 percent were ex-smokers and 54.7 percent were nonsmokers. Mean sleep duration for males and females were 7.17±1.15 and 7.22±1.29 hours, respectively.