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首页> 外文期刊>Journal of Cachexia, Sarcopenia and Muscle >Accelerometer-determined physical activity, muscle mass, and leg strength in community-dwelling older adults
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Accelerometer-determined physical activity, muscle mass, and leg strength in community-dwelling older adults

机译：加速度计确定的社区居民老年人的体育活动，肌肉质量和腿部力量

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Abstract Introduction The aim of this study was to describe the relationship between accelerometer-determined physical activity (PA), muscle mass, and lower-limb strength in community-dwelling older adults. Methods Six hundred thirty-six community-dwelling older adults (66 ???± 7 years) were studied. Muscle mass was measured using dual-energy x-ray absorptiometry, whilst lower limb strength was measured via dynamometry. We measured minutes/day spent in sedentary, light, moderate, and vigorous intensity activity using Actigraph GT1M accelerometers. Results Participants spent a median of 583(Interquartile ratio (IQR) 522?￠????646), 225(176?￠????271), 27(12?￠????45) and 0(0?￠????0) min in sedentary, light, moderate, and vigorous activity, respectively. PA intensity was positively associated with both lean mass percentage and lower limb strength in a dose?￠????response fashion. Sedentary activity was negatively associated with lean mass percentage, but not lower-limb strength. There was a positive association between PA and appendicular lean mass in men only. There was an interaction between age and activity; as age increased, the magnitude of the association of PA with lean mass percentage decreased. Those who adhered to the Australian Department of Health PA guidelines (moderate/vigorous PA >/=150 min/week) had greater lean mass percentage, appendicular lean mass, and lower limb strength. Conclusions Using accelerometer technology, both the amount and intensity of accelerometer-determined PA had an independent, dose?￠????response relationship with lean mass percentage and lower limb strength, with the largest effect for vigorous activity. Time spent in sedentary activity was negatively associated with lean mass percentage, but was not associated with lower limb strength. The magnitude of the association between PA and lean mass percentage decreased with age, suggesting that PA programmes may need to be modified with increasing age.
机译：摘要简介这项研究的目的是描述在社区居住的老年人中，加速度计确定的体育活动（PA），肌肉质量和下肢力量之间的关系。方法研究了366例社区居住的老年人（66±7岁）。使用双能X射线吸收法测量肌肉质量，而通过测功法测量下肢力量。我们使用Actigraph GT1M加速度计测量了久坐，轻度，中度和剧烈运动强度下的分钟/天。结果参与者的中位数分别为583（四分位数比（IQR）522？￠ ?????? 646），225（176？￠ ???? 271），27（12 ??????? 45）和0（0静坐，轻度，中度和剧烈运动分别为0分钟。 PA强度与瘦体重百分比和下肢力量呈正相关，呈剂量-反应方式。久坐活动与瘦体重百分比负相关，但与下肢力量无关。仅在男性中，PA和阑尾瘦质量之间存在正相关。年龄和活动之间存在相互作用。随着年龄的增长，PA与瘦肉质量百分比的关联程度降低。那些遵守澳大利亚卫生部PA指南（中度/剧烈PA> / = 150分钟/周）的人具有更高的瘦体重百分比，阑尾瘦体重和下肢力量。结论使用加速度计技术，由加速度计确定的PA的量和强度与瘦体重百分比和下肢力量具有独立的剂量反应关系，对剧烈运动的影响最大。久坐的时间与瘦体重百分比负相关，但与下肢力量无关。 PA和瘦肉质量百分比之间的关联程度随着年龄的增长而降低，这表明PA程序可能需要随着年龄的增长而进行修改。

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