Peeters Geeske, Lips Paul, Brown Wendy J
School of Human Movement Studies, The University of Queensland, St Lucia, Brisbane, QLD 4072 Australia.
School of Population Health, The University of Queensland, Brisbane, QLD Australia.
Eur J Ageing. 2013 Oct 30;11(3):205-212. doi: 10.1007/s10433-013-0300-x. eCollection 2014 Sep.
The combined effects of physical activity (PA) and sitting time (ST) on physical functioning (PF) may be stronger than for each factor separately. This study examined associations between ST, PA, and PF over 6 years in older women. Data were from 6,611 participants in the Australian Longitudinal Study on Women's Health (mean age 78 ± 1.5 years). Activity pattern at baseline (2002) was categorized as one of 12 combinations of ST (<4, 4-7, or ≥8 h/day) and PA (<40, 40-450, 450-900, or ≥900 MET min/week). PF was measured using the SF-36 (range 0-100) in 2002, 2005, and 2008. General estimating equations for linear regression were used with adjustment for confounders. Baseline PF ranged from 40 to 74 in the least to the most active groups. PF was 6.3 (95 % confidence interval [CI] -7.6 to -5.0) points lower in participants sitting ≥8 h/day than in participants sitting <4 h/day, and 16.9 (CI 15.7-18.0) points higher in participants reporting ≥900 MET min/week than in participants reporting <40 MET min/week PA. Compared with the least active pattern, those in the most active pattern scored 24.5 (CI 22.5-26.4) points higher. The decline over 6 years was greater in the more active categories: 5 and 16 points in the least and most active categories. In conclusion, in women, both high physical activity and low sitting time are important for establishing a certain level of PF prior to age 76-81, but do not protect against decline in PF over time later in life. The combined effect of ST and PA did not differ from their individual effects on PF.
身体活动（PA）和久坐时间（ST）对身体机能（PF）的综合影响可能比单独考虑每个因素时更强。本研究调查了老年女性6年期间ST、PA和PF之间的关联。数据来自澳大利亚女性健康纵向研究中的6611名参与者（平均年龄78±1.5岁）。基线（2002年）时的活动模式被分类为ST（<4、4 - 7或≥8小时/天）和PA（<40、40 - 450、450 - 900或≥900代谢当量分钟/周）的12种组合之一。2002年、2005年和20从最不活跃到最活跃的组中，基线PF范围为40至74。每天久坐≥8小时的参与者的PF比每天久坐<4小时的参与者低6.3（95%置信区间[CI] -7.6至-5.0）分，报告每周PA≥900代谢当量分钟的参与者的PF比报告每周PA<40代谢当量分钟的参与者高16.9（CI 15.7 - 18.0）分。与最不活跃的模式相比，最活跃模式的参与者得分高24.5（CI 22.5 - 26.4）分。在更活跃的类别中，6年期间的下降幅度更大：最不活跃和最活跃类别分别下降5分和16分。总之，对于女性而言，高身体活动和低久坐时间对于在76 - 81岁之前建立一定水平的PF很重要，但并不能防止晚年PF随时间下降。ST和PA的综合影响与它们对PF的单独影响没有差异。 8年使用SF - 36（范围0 - 100）测量PF。使用一般估计方程进行线性回归，并对混杂因素进行调整。
