Exercise and Health Laboratory, CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz-Quebrada, Portugal.
Behavioural Epidemiology Laboratory, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.
J Gerontol A Biol Sci Med Sci. 2015 Jan;70(1):119-24. doi: 10.1093/gerona/glu193. Epub 2014 Oct 16.
Physical function is a key determinant that corresponds to the physiological capacity of older adults to perform normal everyday activities, safely and independently, without undue fatigue. We examined the associations of sedentary behavior (SB), breaks in sedentary time (BST), and moderate-to-vigorous physical activity (MVPA) with physical function in older adults.
Physical activity and SB were assessed with accelerometers (ActiGraph, GT1M) and physical function with the Senior Fitness Test battery, among 87 males and 128 females aged between 65 and 94 years. A composite Z-score was created based on the individual scores for each Senior Fitness Test battery item. Associations of SB, BST, and MVPA with physical function were examined, adjusting for demographic attributes, physical independence, and medical status.
A significant positive association was found between BST and the composite physical function Z-score, after adjusting for total SB, MVPA, and potential confounders. MVPA was also positively associated with physical function, after adjusting for SB, BST, and potential confounders. Those with low BST in conjunction with performing less than 30min/d of MVPA had lower physical function.
Breaking-up sedentary time is associated with better physical function in older adults; and, it may have an important place in future guidelines on preserving older adults' physical function to support activities of daily living.
身体机能是一个关键决定因素，反映了老年人进行日常活动的生理能力，能安全且独立，而不会过度疲劳。我们研究了久坐行为（SB）、久坐时间中断（BST）和中高强度体力活动（MVPA）与老年人身体机能的关系。
使用加速度计（ActiGraph，GT1M）评估体力活动和 SB，使用 Senior Fitness Test 电池评估身体机能，参与者为年龄在 65 至 94 岁之间的 87 名男性和 128 名女性。根据 Senior Fitness Test 电池中每个项目的个人得分创建综合 Z 分数。在调整人口统计学属性、身体独立性和医疗状况后，研究了 SB、BST 和 MVPA 与身体机能的关系。
在调整了总 SB、MVPA 和潜在混杂因素后，BST 与综合身体机能 Z 分数呈显著正相关。在调整了 SB、BST 和潜在混杂因素后，MVPA 也与身体机能呈正相关。那些 BST 低且 MVPA 每天少于 30 分钟的人身体机能较低。
打破久坐时间与老年人更好的身体机能有关；并且，它可能在未来关于保持老年人身体机能以支持日常生活活动的指南中占有重要地位。
