Background Elderly residents have a high incidence of dyslipidemia and feature sedentary lifestyles. Sedentary behavior is associated with dyslipidemia. However, studies on sedentary time and blood lipid level of elderly residents in China are still insufficient.
Objective This study investigates the correlation between blood lipid level and dyslipidemia prevalence of elderly residents with different lengths of TV time in China, and to provide a scientific basis for the study on the relationship between sedentary behavior and dyslipidemia.
Methods Data were derived from the China Nutritional Transition Cohort Study 2015, where elderly residents aged 60 years and above in 15 provinces (including municipalities and autonomous regions) (hereinafter referred to as 15 provinces) of China were selected as study subjects and were asked to complete a questionnaire on their average weekly TV time and physical activity in the past year, as well as biochemical measurements such as total cholesterol (TC), triglyceride (TG), low-density lipoprotein-cholestrol (LDL-C), and highdensity lipoprotein-cholestrol (HDL-C). TV time was tertiled into low, middle, and high levels. Dyslipidemia was determined according to the Chinese Guidelines on Prevention and Treatment of Dyslipidemia in Adults (2016). Linear regression was used to analyze the trend of continuous variables across different TV time levels. Chi-square trend test was used to analyze the trend of classified variables in different TV time levels. Multiple linear regression was used to analyze the effects of different TV time levels on blood lipid levels. Multiple logistic regression was used to analyze the risk of dyslipidemia at different TV time levels.
Results A total of 4 301 elderly residents were surveyed, of which 47.2% were men. The groups of low, middle, and high levels of TV time were divided into < 14, 14-21, and >21 h/week for males, and < 10.5, 10.5-17.5, and >17.5 h/week for females. The contents of TC, TG, and LDL-C and the prevalence of high LDL-C level all increased with higher TV time levels, and the content of HDL-C decreased with higher TV time levels for males. The TG content and the prevalence of low HDL-C level increased with higher TV time levels for females. After adjusting for confounding factors (age, residence, educational background, income, smoking, drinking, physical activity level, diet, body mass index, and waist circumference), the multiple linear regression results showed that the TC and LDL-C levels in the middle-level TV time male group increased by 0.084 and 0.057 g/L respectively compared with those in the low-level group, while the TG level in the high-level TV time female group increased by 0.138 g/L compared with that in the low-level group. The multiple logistic regression results showed that the risks of hypercholesterolemia in the middle- and high-level TV time groups for males were 1.7 (95% CI:1.2-2.5) and 1.6 (95% CI:1.1-2.4) times higher than that in the low-level group respectively; the risks of high LDL-C level in the middle- and high-level TV time groups for males were 1.6 (95% CI:1.1-2.3) and 1.5 (95% CI:1.0-2.1) times higher than that in the low-level group respectively; the risk of low HDL-C level in the high-level TV time group for females was 1.4 (95% CI:1.1-1.8) times higher than that in the low-level group.
Conclusion The TV time of elderly residents in 15 provinces of China has positive correlations with the TC and LDL-C levels for men and with the TG level for women, and is associated with increased risks of hypercholesterolemia and high LDL-C level for men and low HDL-C level for women.
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