Berkemeyer K, Wijndaele K, White T, Cooper A J M, Luben R, Westgate K, Griffin S J, Khaw K T, Wareham N J, Brage S
MRC Epidemiology Unit, University of Cambridge, School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, CB2 0QQ, UK.
Strangeways Research Laboratory, University of Cambridge, Worts Causeway, Cambridge, CB1 8RN, UK.
Int J Behav Nutr Phys Act. 2016 Jan 7;13:2. doi: 10.1186/s12966-015-0316-z.
Objectively measured physical activity between older individuals and between populations has been poorly described. We aimed to describe and compare the variation in accelerometry data in older UK (EPIC-Norfolk) and American (NHANES) adults.
Physical activity was measured by uniaxial accelerometry in 4,052 UK (49-91 years) and 3459 US older adults (49-85 years). We summarized physical activity as volume (average counts/minute), its underlying intensity distribution, and as time spent <100counts/minute, ≥809counts/minute and ≥2020counts/minute both for total activity and that undertaken in ≥10-min bouts.
In EPIC-Norfolk 65% of wear-time was spent at <100 counts/minute and 20% spent in the range 100-500 counts/minute. Only 4.1% of this cohort accumulated more than 30 min/day of activity above 2020 counts/minute in 10-min bouts. If a cut-point of >809 counts/minute is used 18.7% of people reached the 30 min/day threshold. By comparison, 2.5% and 9.5% of American older adults accumulated activity at these levels, respectively.
As assessed by objectively measured physical activity, the majority of older adults in this UK study did not meet current activity guidelines. Older adults in the UK were more active overall, but also spent more time being sedentary than US adults.
针对老年人个体之间以及不同人群之间的客观测量身体活动情况，目前描述甚少。我们旨在描述并比较英国（EPIC-诺福克）和美国（NHANES）老年成年人加速度计数据的差异。
采用单轴加速度计测量了4052名英国老年成年人（49 - 91岁）和3459名美国老年成年人（49 - 85岁）的身体活动情况。我们将身体活动总结为运动量（平均计数/分钟）、其潜在强度分布，以及总活动和≥10分钟时间段内活动中每分钟计数<100、≥809和≥2020的时间。
在EPIC-诺福克研究中，65%的佩戴时间处于每分钟计数<100，20%处于100 - 500计数/分钟范围。该队列中只有4.1%的人在10分钟时间段内每天累计超过30分钟的活动量达到每分钟计数高于2020。如果使用每分钟计数>809的切点，则18.7%的人达到了每天30分钟的阈值。相比之下，美国老年成年人中分别有2.5%和9.5%的人在这些水平上积累了活动量。
通过客观测量的身体活动评估，这项英国研究中的大多数老年人未达到当前的活动指南。英国的老年人总体上更活跃，但与美国成年人相比，久坐时间也更长。
