背景:本研究旨在调查社区中老年女性中加速度计测量的身体活动(PA)和久坐行为(SB)与身体功能(PF)之间的关系。
方法:本研究包括1,113名社区居住的老年女性,平均年龄为65±2岁。我们采用线性回归分析来研究PA和SB模式与PF之间的关系。PA变量由总PA时间组成,预测PA时间(持续等于或超过10分钟的连续PA),和零星的PA时间(持续少于10分钟的连续PA)。SB变量包括总SB时间,30分钟的SB(持续等于或超过30分钟的连续SB),和60分钟的SB(持续等于或超过60分钟的连续SB)。PF变量包括手握强度(HGS),闭眼单腿站立测试(OLSTEC),通常的步行速度(UWS),最大步行速度(MWS)和椅子站立时间(CT)。探讨中强强度PA(MVPA)和SB对PF的联合作用,我们将老年妇女参与SB和MVPA的持续时间分为不同的组合:低MVPA和高SB,低MVPA和低SB,高MVPA和高SB,高MVPA和低SB。
结果:研究表明,30分钟的SB和CT之间存在显着关联,在调整总MVPA时间后仍然存在(P=0.021)。发现总MVPA和blotedMVPA与更好的UWS呈正相关,MWS,CT,和PFZ分数。当使用低MVPA和高SB的组合作为参考时,高MVPA和高SB组的PF回归系数上升了1.32(P<0.001),高MVPA和低SB组的PF回归系数上升了1.13(P<0.001)。
结论:观察到下肢功能较差与延长,老年妇女不间断的SB,而不是总的SB时间。同时,MVPA参与不足也可能是导致老年女性PF较差的一个关键因素.参与更长的持续时间和更高强度的PA,例如持续至少10分钟或更长时间的MVPA发作,可能有助于更好的PF。
BACKGROUND: This study aimed to investigate the relationships between accelerometer-measured physical activity (PA) and sedentary behaviour (SB) with physical function (PF) among older Chinese women in the community.
METHODS: The present study comprised 1,113 community-dwelling older females, with an average age of 65 ± 2 years. We employed a linear regression analysis to investigate the relationship between patterns of PA and SB with PF. PA variables consisted of total PA time, bouted PA time (a continuous PA that lasts equal to or more than 10 min), and sporadic PA time (a continuous PA that lasts less than 10 min). SB variables included total SB time, 30-min bout of SB (a continuous SB that lasts equal to or more than 30 min), and 60-min bout of SB (a continuous SB that lasts equal to or more than 60 min). PF variables comprised handgrip strength (HGS), one-legged stance test with eyes closed (OLSTEC), usual walking speed (UWS), maximum walking speed (MWS) and chair-stand time (CT). To explore the joint effects of moderate-to-vigorous-intensity PA (MVPA) and SB on PF, we divided the duration of SB and MVPA participation in older women into different combinations: low MVPA & high SB, low MVPA & low SB, high MVPA & high SB, high MVPA & low SB.
RESULTS: The study revealed a significant association between 30-min bout of SB and CT, which remained after adjusting for total MVPA time (P = 0.021). Both total MVPA and bouted MVPA were found to be positively associated with better UWS, MWS, CT, and PF Z-score. When the combination of low MVPA & high SB was used as a reference, the regression coefficients for PF ascended by 1.32 (P < 0.001) in the high MVPA & high SB group and by 1.13 (P < 0.001) in the high MVPA & low SB group.
CONCLUSIONS: A significant association was observed between poorer lower limb function and prolonged, uninterrupted SB in older women, rather than with the total SB time. Concurrently, the insufficient engagement in MVPA may also be a crucial factor contributing to poorer PF in older women. Engaging in longer durations and higher intensity of PA, such as bouts of MVPA lasting a minimum of 10 min or longer, may contribute to better PF.