Actigraph accelerometer-defined boundaries for sedentary behaviour and physical activity intensities in 7 year old children.
Actigraph accelerometer-defined boundaries for sedentary behaviour and physical activity intensities in 7 year old children.
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DOI：
10.1371/journal.pone.0021822
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Griffiths LJ
中科院分区：
文献类型：
--
作者：
Pulsford RM;Cortina-Borja M;Rich C;Kinnafick FE;Dezateux C;Griffiths LJ
准确客观地评估儿童时期的久坐行为和身体活动行为，对于理解它们与后来的健康结果的关系以及记录人群中身体活动的频率和分布是不可或缺的。校准Actigraph GT1M加速度计，使用能量消耗（EE）作为标准测量，定义适合用于幼儿大规模流行病学研究的久坐行为和身体活动类别的阈值。使用COSMED K4b2便携式代谢仪对53名7岁儿童进行基于加速计的身体活动评估（每分钟计数），并根据在运动强度范围内获得的EE测量值（kcal.kg−1.hr−1）进行校准。孩子们进行了7项活动：躺着看电视、坐着玩电脑游戏、慢走、快走、慢跑、跳房子和篮球。采用线性判别分析（LDA）建立阈值计数，以确定久坐行为和轻度、中度和剧烈身体活动，并采用受试者工作特征（ROC）曲线分析进行评估。情感表达与除慢跑外的所有非久坐活动的计数显著相关。久坐行为的加速度计计数阈值（counts.minute−1）分别为<100，轻度、中度和剧烈身体活动的加速度计计数阈值分别为≤2240、≤3840和≥3841。区分久坐行为和剧烈运动的ROC曲线下面积为0.98。轻度和中度体力活动的界限不太明确（分别为0.61和0.60）。久坐（99%和97%）和剧烈运动（95%和91%）阈值的敏感性和特异性高于轻度阈值（60%和83%）和中度阈值（61%和76%）。本研究中建立的加速度计切点可用于对久坐行为进行分类，并区分该年龄段儿童的轻度、中度和剧烈体育活动。
Accurate objective assessment of sedentary and physical activity behaviours during childhood is integral to the understanding of their relation to later health outcomes, as well as to documenting the frequency and distribution of physical activity within a population. To calibrate the Actigraph GT1M accelerometer, using energy expenditure (EE) as the criterion measure, to define thresholds for sedentary behaviour and physical activity categories suitable for use in a large scale epidemiological study in young children. Accelerometer-based assessments of physical activity (counts per minute) were calibrated against EE measures (kcal.kg−1.hr−1) obtained over a range of exercise intensities using a COSMED K4b2 portable metabolic unit in 53 seven-year-old children. Children performed seven activities: lying down viewing television, sitting upright playing a computer game, slow walking, brisk walking, jogging, hopscotch and basketball. Threshold count values were established to identify sedentary behaviour and light, moderate and vigorous physical activity using linear discriminant analysis (LDA) and evaluated using receiver operating characteristic (ROC) curve analysis. EE was significantly associated with counts for all non-sedentary activities with the exception of jogging. Threshold values for accelerometer counts (counts.minute−1) were <100 for sedentary behaviour and ≤2240, ≤3840 and ≥3841 for light, moderate and vigorous physical activity respectively. The area under the ROC curves for discrimination of sedentary behaviour and vigorous activity were 0.98. Boundaries for light and moderate physical activity were less well defined (0.61 and 0.60 respectively). Sensitivity and specificity were higher for sedentary (99% and 97%) and vigorous (95% and 91%) than for light (60% and 83%) and moderate (61% and 76%) thresholds. The accelerometer cut points established in this study can be used to classify sedentary behaviour and to distinguish between light, moderate and vigorous physical activity in children of this age.
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影响因子：
4.1
作者：
Corder, Kirsten;Brage, Soren;Ekelund, Ulf
通讯作者：
Ekelund, Ulf
影响因子：
3.7
作者：
FRIEDMAN, JH;TUKEY, JW
通讯作者：
TUKEY, JW
DOI：
10.1249/01.mss.0000079078.62035.ec
发表时间：
2003-08-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Brage, S;Wedderkopp, N;Froberg, K
通讯作者：
Froberg, K
影响因子：
3.4
作者：
Evenson, Kelly R.;Catellier, Diane J.;McMurray, Robert G.
通讯作者：
McMurray, Robert G.
影响因子：
3.8
作者：
Guinhouya, Comlavi B.;Lemdani, Mohamed;Hubert, Herve
通讯作者：
Hubert, Herve