Division of Community Health Sciences, St George's, University of London, Cranmer Terrace, Tooting, London, SW17 ORE, UK.
Br J Sports Med. 2009 Jun;43(6):442-50. doi: 10.1136/bjsm.2008.048033. Epub 2008 May 16.
To assess physical activity (PA) levels measured objectively using accelerometers in community-dwelling older people and to examine the associations with health, disability, anthropometric measures and psychosocial factors.
Cross-sectional survey.
Single general practice (primary care centre), United Kingdom.
Random selection of 560 community-dwelling older people at least 65 years old, registered with the practice. 43% (238/560) participated.
Participants completed a questionnaire assessing health, disability, psychosocial factors and PA levels; underwent anthropometric assessment; and wore an accelerometer (Actigraph) for 7 days.
Average daily accelerometer step-counts and time spent in different PA levels. Associations between step-counts and other factors were examined using linear regression.
Average daily step-count was 6443 (95% CI 6032 to 6853). Men achieved 754 (84 to 1424) more steps daily than women. Step-count declined steadily with age. Independent predictors of average daily step-count were: age; general health; disability; diabetes; body mass index; exercise self-efficacy; and perceived exercise control. Activities associated independently with higher step-counts included number of long walks and dog-walking. Only 2.5% (6/238) of participants achieved the recommended 150 minutes weekly of at least moderate-intensity activity in > or = 10 minute bouts; 62% (147/238) achieved none.
This is the first population-based sample of older people with objective PA and anthropometric measures. PA levels in older people are well below recommended levels, emphasising the need to increase PA in this age group, particularly in those who are overweight/obese or have diabetes. The independent effects of exercise self-efficacy and exercise control on PA levels highlight their role as potential mediators for intervention studies.
使用加速度计客观测量社区居住的老年人的身体活动（PA）水平，并研究其与健康、残疾、人体测量指标和心理社会因素的关联。
横断面调查。
英国一家普通诊所（初级保健中心）。
从该诊所登记的至少 65 岁的社区居住的老年人中随机选择 560 人，其中 43%（238/560）参与了研究。
参与者完成了一份问卷，评估健康、残疾、心理社会因素和 PA 水平；接受了人体测量评估；并佩戴加速度计（Actigraph）7 天。
平均每日加速度计计步数和不同 PA 水平的时间。使用线性回归分析计步数与其他因素之间的关系。
平均每日计步数为 6443 步（95%CI 6032 至 6853）。男性每天比女性多走 754 步（84 至 1424）。计步数随年龄稳步下降。平均每日计步数的独立预测因素包括：年龄；总体健康状况；残疾；糖尿病；体重指数；运动自我效能感；以及感知的运动控制。与较高计步数独立相关的活动包括长距离散步和遛狗的次数。只有 2.5%（6/238）的参与者达到了每周至少 150 分钟、强度为中等及以上、持续时间大于等于 10 分钟的活动推荐量；62%（147/238）的参与者没有达到这一水平。
这是第一个具有客观 PA 和人体测量指标的社区老年人的代表性样本。老年人的 PA 水平远低于推荐水平，这强调了需要增加这一年龄组的 PA 水平，尤其是在超重/肥胖或患有糖尿病的人群中。运动自我效能感和运动控制对 PA 水平的独立影响突出了它们作为干预研究潜在中介因素的作用。
