Associations of screen-based sedentary activities with all cause dementia, Alzheimer’s disease, vascular dementia: a longitudinal study based on 462,524 participants from the UK Biobank

• Published in: BMC public health Vol. 23; no. 1; pp. 1 - 13
• Main Authors: Yuan, Shiqi, Li, Wanyue, Ling, Yitong, Huang, Xiaxuan, Feng, Aozi, Tan, Shanyuan, He, Ningxia, Li, Li, Li, Shuna, Xu, Anding, Lyu, Jun
• Format: Journal Article
• Language: English
• Published: London BioMed Central Ltd 02.11.2023; BioMed Central; BMC
• Subjects: Advertising executives; Alzheimer's disease; Analysis; Bidirectional Mendelian randomization; Binswanger's disease; Biobanks; Brain research; Brain structure; Cerebrovascular disease; Computer use; Confounding (Statistics); Correlation; Dementia; Dementia disorders; Disease prevention; Disease susceptibility; Evidence-based medicine; Genetic aspects; Genetic susceptibility; Genetics; Genotype-environment interactions; Health aspects; Health risk assessment; Longitudinal studies; Magnetic resonance imaging; Methods; Neurodegenerative diseases; Physical fitness; Prevention; Public health; Risk; Risk assessment; Risk factors; Sedentary behavior; Sexually transmitted diseases; Statistical models; STD; Television viewers; TV viewing; UK Biobank; Vascular dementia; Viewing; China; United Kingdom > UK
• ISSN: 1471-2458; 1471-2458
• DOI: 10.1186/s12889-023-17050-3

Background Current drug treatments for dementia aren't effective. Studying gene-environment interactions can help develop personalized early intervention strategies for Alzheimer's disease (AD). However, no studies have examined the relationship between screen-based sedentary activities and genetic susceptibility to AD risk, and further understanding of the causal relationship is also crucial. Methods This study included 462,524 participants from the UK Biobank with a follow-up of 13.6 years. Participants' screen-based sedentary activities time was categorized into three groups based on recorded time: [greater than or equal to] 4 h/day, 2-3 h/day, and [less than or equal to] 1 h/day. Cox proportional risk models were used to analyze the association between computer use/TV viewing groups and the risk of all-cause dementia, AD and vascular dementia (VD). Generalized linear model (GLM) were used to examine the relationship between screen-based sedentary activities and brain structure. Bidirectional Mendelian randomization (MR) was used to validate the causal relationship between TV viewing and AD. Results Compared to TV viewing [less than or equal to] 1 h/day, 1)TV viewing 2-3 h/day was correlated with a higher risk of all-cause dementia (HR = 1.09, 95% CI:1.01-1.18, P < 0.05), and TV viewing [greater than or equal to] 4 h/day was associated with a higher risk of all-cause dementia (HR = 1.29, 95% CI: 1.19-1.40, P < 0.001), AD (HR = 1.25, 95% CI:1.1-1.42, P < 0.001), and VD (HR = 1.24, 95% CI: 1.04-1.49, P < 0.05); 2) TV viewing [greater than or equal to] 4 h/day was correlated with a higher AD risk at intermediate (HR = 1.34, 95% CI: 1.03-1.75, P < 0.001) and high AD genetic risk score (AD-GRS) (HR = 2.18, 95% CI: 1.65-2.87, P < 0.001);3) TV viewing 2-3 h/day [[beta] = (-94.8), 95% CI: (-37.9) -(-151.7), P < 0.01] and TV viewing [greater than or equal to] 4 h/day [[beta] = (-92.94), 95% CI: (-17.42) -(-168.46), P < 0.05] were correlated with a less hippocampus volume. In addition, a causal effect of TV viewing times was observed on AD analyzed using MR Egger (OR = 5.618, 95%CI:1.502-21.013, P < 0.05). Conclusions There was a causal effect between TV viewing time and AD analyzed using bidirectional MR, and more TV viewing time exposure was correlated with a higher AD risk. Therefore, it is recommended that people with intermediate and high AD-GRS should control their TV viewing time to be less than 4 h/ day or even less than 1 h/day. Keywords: TV viewing, Genetic susceptibility, Brain structure, Dementia, Bidirectional Mendelian randomization, UK Biobank