Jefferis Barbara J, Sartini Claudio, Lee I-Min, Choi Minkyoung, Amuzu Antoinette, Gutierrez Christina, Casas Juan Pablo, Ash Sarah, Lennnon Lucy T, Wannamethee S Goya, Whincup Peter H
UCL Department of Primary Care & Population Health, UCL, London, UK.
BMC Public Health. 2014 Apr 19;14:382. doi: 10.1186/1471-2458-14-382.
Physical activity (PA) levels in older adults decline with age. The prevalence and correlates of adherence to current UK PA guidelines in older adults has not been studied using objectively measured PA, which can examine precisely whether PA is carried out in bouts of specified length and intensity.
Free living men and women aged 70-93 years from 25 towns in the United Kingdom, participating in parallel on-going population based cohort studies were invited (by post) to wear a GT3x accelerometer over the hip for one week in 2010-12. Adherence to UK PA guidelines was defined as ≥150 minutes/week of moderate or vigorous PA (MVPA) in bouts of ≥10 minutes; the effect of different intensities and durations were examined.
1593 men and 857 women participated (responses 51% and 29% respectively). 15% men and 10% women achieved ≥150 minutes/week of MVPA (defined as >1040 cpm) in bouts lasting ≥10 minutes. With MVPA defined as >1952 cpm, prevalences were 7% and 3% respectively. Those adhering to guidelines were younger, had fewer chronic health conditions, less depression, less severe mobility limitations, but higher exercise self-efficacy and exercise outcomes expectations. They rated their local environment more highly for social activities and leisure facilities, having somewhere nice to go for a walk and feeling safe after dark, They left the house on more days per week, were more likely to use active transport (cycle or walk) and to walk a dog regularly.
Few older adults attain current PA guidelines. Health promotion to extend the duration of moderate-intensity activity episodes to 10 minutes or more could yield important health gains among older adults. However future studies will need to clarify whether attaining guideline amounts of PA in spells lasting 10 minutes or more is critical for reducing chronic disease risks as well as improving cardiometabolic risk factors.
老年人的身体活动（PA）水平会随着年龄增长而下降。目前尚未使用客观测量的PA对老年人遵守英国PA指南的患病率及其相关因素进行研究，客观测量的PA能够精确检查PA是否以特定时长和强度的时间段进行。
邀请来自英国25个城镇、年龄在70 - 93岁、正在参与平行进行的基于人群队列研究的自由生活男性和女性，于2010 - 2012年期间在髋部佩戴GT3x加速度计一周。遵守英国PA指南的定义为每周进行时长≥10分钟的中等强度或剧烈PA（MVPA）达≥150分钟；研究了不同强度和时长的影响。
1593名男性和857名女性参与研究（回复率分别为51%和29%）。15%的男性和10%的女性在持续≥10分钟的时间段内达到每周≥150分钟的MVPA（定义为>1040次/分钟）。若将MVPA定义为>1952次/分钟，患病率分别为7%和3%。遵守指南的人更年轻，慢性健康问题更少，抑郁程度更低，行动受限程度较轻，但运动自我效能和运动结果期望更高。他们对当地社会活动和休闲设施的评价更高，有适合散步的好去处且天黑后感到安全，每周出门天数更多，更有可能使用主动出行方式（骑自行车或步行）且经常遛狗。
很少有老年人达到目前的PA指南要求。促进健康以使中等强度活动时间段延长至10分钟或更长时间，可能会给老年人带来重要的健康益处。然而，未来的研究需要阐明，在持续10分钟或更长时间的时间段内达到PA指南规定的量对于降低慢性病风险以及改善心脏代谢风险因素是否至关重要。
