The combined effects of physical activity and sedentary behavior on dementia onset among older adults
Oral Presentation A7.4
DOI:
https://doi.org/10.14288/hfjc.v14i3.402Keywords:
Older Adults, Physical Activity, Reading, DementiaAbstract
Background: Combined effects of physical activity (PA) and passive/mentally active sedentary behavior (SB) on dementia are unclear. Purpose: Identifying the effects of these behaviors on dementia onset among older adults. Methods: All residents aged ≥65 in Tsuru, Yamanashi, Japan, were enrolled. A mail survey was conducted in 2016. Respondents were followed up for five years, and 5323 participants were included in the analyses (79.7%). Dementia onset was examined using long-term care insurance data. PA was evaluated with the International Physical Activity Questionnaire and categorized into <2.5 MET-h/week as “low,” <16.0 MET-h/week as “moderate,” and ≥16.0 MET-h/week as “high.” We assessed sitting time for watching TV as passive SB (<1 h/day, <3 h/day, ≥3 h/day) and reading time (RT) as mentally active SB (<10 min/day, <30 min/day, ≥30 min/day). To examine the associations of PA and SB with dementia, we performed Fine-Gray models and calculated sub-distribution hazard ratios [95% confidence intervals]. Results: During the 5-year follow-up, 606 (11.4%) individuals developed dementia. Analyses showed that PA (moderate: 0.75[0.59, 0.95], high: 0.54[0.36, 0.80]) and RT (high: 0.76[0.60, 0.97]) were associated with reduced the risk of dementia. Compared with low PA and low RT group, moderate PA and moderate RT, high PA and moderate RT, high PA and high RT were associated with a lower dementia risk. Conclusions: PA and RT reduce the risk of dementia. Interventions promoting both PA and RT would be effective for preventing dementia. Funding: Japan Society for the Promotion of Science (15H03089).
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Copyright (c) 2021 Yuta Nemoto, Shinichiro Sato, Yoshinori Kitabatake, Noriko Takeda, Kazushi Maruo, Takashi Arao
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