Foong Yi Chao, Aitken Dawn, Winzenberg Tania, Otahal Petr, Scott David, Jones Graeme
Menzies Research Institute Tasmania, University of Tasmania, Private Bag 23, Hobart, Tasmania 7000, Australia.
Menzies Research Institute Tasmania, University of Tasmania, Private Bag 23, Hobart, Tasmania 7000, Australia.
Exp Gerontol. 2014 Jul;55:107-12. doi: 10.1016/j.exger.2014.04.006. Epub 2014 Apr 18.
The aim of this study was to describe the relationship between accelerometer-determined physical activity (PA) and adiposity in community-dwelling older adults. In addition, we were interested in comparing the extent of correlation between questionnaire and accelerometer determined PA.
636 community-dwelling older adults (66±7years) were studied. Adiposity was measured using dual-energy X-ray absorptiometry and BMI was calculated. We measured minutes/day spent in sedentary, light, moderate and vigorous intensity activity using both questionnaires and Actigraph GT1M accelerometers.
Participants spent a median of 583(IQR 522-646), 225(176-271), 27(12-45) and 0(0-0) minutes in sedentary, light, moderate and vigorous activities respectively. There was a non linear dose-response inverse relationship between activity intensity and adiposity. After adjusting for age, sex and other levels of PA, for every 10minute increase in activity, total body fat decreased by 169g(95% CI 61-277), 905g(632-1178), and 2208g(759-3657) for light, moderate and vigorous activities respectively. There was an interaction between age and activity; as age increased, the magnitude of the effects of light and moderate activities on adiposity decreased. Sedentary minutes were not associated with adiposity after adjusting for time spent at other PA intensities. Questionnaire measures of PA were weakly correlated with body fat measures when compared to accelerometer determined PA.
Both the amount and intensity of PA, but not sedentary time, have an independent dose-response association with adiposity. The association is much stronger using objective assessment compared to questionnaire. The magnitude of these associations decrease with age suggesting that physical activity programmes may need to be modified with increasing age.
本研究旨在描述社区居住的老年人中，通过加速度计测定的身体活动（PA）与肥胖之间的关系。此外，我们还对比较问卷法和加速度计法测定的PA之间的相关程度感兴趣。
对636名社区居住的老年人（66±7岁）进行了研究。使用双能X线吸收法测量肥胖程度，并计算体重指数（BMI）。我们通过问卷法和Actigraph GT1M加速度计测量了每天在久坐、轻度、中度和剧烈强度活动中所花费的分钟数。
参与者在久坐、轻度、中度和剧烈活动中分别花费的中位数时间为583（四分位间距522 - 646）、225（176 - 271）、27（12 - 45）和0（0 - 0）分钟。活动强度与肥胖之间存在非线性剂量反应反比关系。在调整年龄、性别和其他PA水平后，对于轻度、中度和剧烈活动，每增加10分钟的活动，全身脂肪分别减少169克（95%可信区间61 - 277）、905克（632 - 1178）和2208克（759 - 3657）。年龄与活动之间存在相互作用；随着年龄的增加，轻度和中度活动对肥胖的影响程度降低。在调整了其他PA强度所花费的时间后，久坐分钟数与肥胖无关。与加速度计测定的PA相比，问卷法测量的PA与身体脂肪测量值之间的相关性较弱。
PA的量和强度而非久坐时间与肥胖存在独立的剂量反应关联。与问卷法相比，使用客观评估时这种关联要强得多。这些关联的程度随着年龄的增加而降低，这表明体育活动计划可能需要随着年龄的增长而进行调整。
