基于等时替代模型的身体活动、久坐行为与城市社区老年女性衰弱的关系研究

doi:10.15942/j.jcsu.2025.02.18

Abstract

Abstract: Objective: The relationship between older women frailty and behavioral changes (such as physical activity replacing sedentary behavior) is not clear. This study used isotemporal substitution model to simulate the effect of light physical activity (LPA) and moderate-vigorous physical activity (MVPA) replacing sedentary behavior (SEB) on older women frailty. Methods: A convenient sampling method was used to recruit 1370 participants aged 60-70 years from multiple communities in Yantai, and 1099 participants were finally included. MVPA, LPA and SEB were objectively measured with accelerometer. The frailty status was evaluated according to the Fried phenotype. Three binary logistic regression models and three ordered multi-classification logistic regression models (single model, partition model and isotemporal substitution model) were used to evaluate the relationship between MVPA, LPA, SEB and frailty. Results: After adjusting all covariate factors, the single model found that MVPA and LPA were significantly associated with lower risk of pre-frailty and frailty, while SEB was significantly associated with higher risk of pre-frailty and frailty. Putting MVPA, LPA and SEB into the partition model, the results showed that LPA was significantly associated with pre-frailty, but not related to frailty, MVPA was significantly associated with pre-frailty and frailty, and SEB was not associated with pre-frailty and frailty. The results of isotemporal substitution model showed that: (1) 30 minutes of LPA replacing the same amount of SEB significantly reduced the risk of pre-frailty and frailty by 8% and 7% respectively; (2) 30 minutes of MVPA repalcing the same amount of SEB significantly reduced the risk of pre-frailty and frailty by 41% and 47% respectively; (3) 30 minutes of MVPA replacing the same amount of LPA significantly reduced the risk of pre-frailty and frailty by 35% and 42% respectively.Conclusion: MVPA and LPA can change the frailty status of the older women living in the community. At the same time, MVPA is better than LPA in changing the frailty status. Therefore, it is recommended that older women should avoid SEB as much as possible and increase a certain amount of physical activity every day to replace SEB, and they will get more health benefits when MVPA is increased on a daily basis to replace SEB.

Key words: sedentary behavior, physical activity, frailty, isotemporal substitution, older women

CLC Number:

G804.49

WU Shuang, LI Ting, ZHANG Xianliang, CHEN Si, HE Qiang. Association of Time Spent on Physical Activity and Sedentary Behavior with Frailty in Community-dwelling Older Women: Isotemporal Substitution Model[J]. Journal of Chengdu Sport University, 2025, 51(2): 171-178.

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Association of Time Spent on Physical Activity and Sedentary Behavior with Frailty in Community-dwelling Older Women: Isotemporal Substitution Model

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