Is the ArteACC index a valid indicator of free-living physical activity in adolescents?
Is the ArteACC index a valid indicator of free-living physical activity in adolescents?
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DOI：
10.1038/oby.2003.110
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发表时间：
2003-06-01
期刊：
影响因子：
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通讯作者：
Westerterp, K
中科院分区：
文献类型：
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作者：
Ekelund, U;Åman, J;Westerterp, K
目的：本研究的主要目的是验证一个建议的新指标的身体活动，活动相关的时间当量的基础上加速度计（ArteACC），在青少年。第二个目的是建立回归方程预测总能量消耗（TEE）和活动能量消耗[AEE = 0.9 × TEE -静息代谢率（RMR）]。研究方法和程序：RMR和能量消耗（EE）在标准化的运动36名青少年（14至19岁）进行了测量间接热量计。TEE采用双标记水法测量，同时使用加速度计评估体力活动，持续14天。根据实验室和自由生活EE数据计算AEE、与体重相关的AEE（AEE/kg）和基于能量消耗的活动相关时间当量（ArteEE = AEE/[EE参考活动- RMR]）。结果：ArteACC与AEE（r = 0.57; p < 0.0001）和ArteEE（r = 0.68; p < 0.001）显著相关。根据ArteACC计算的体力活动绝对时间（每天分钟数）显著低于ArteEE（p < 0.001）。TEE受RMR、性别和ArteACC的显著影响（r（2）= 0.89）。AEE受性别和ArteACC的显著影响（r（2）= 0.59）。讨论：尽管ArteEE和ArteACC这两个指标之间存在绝对差异，但ArteACC似乎是自由生活体力活动的有效指标。它对TEE和AEE的解释变异分别贡献了3.3%和12.5%。
Objective: The principal aim of this study was to validate a proposed new index of physical activity, the activity-related time equivalent based on accelerometry (ArteACC), in adolescents. A secondary aim was to develop regression equations for prediction of total energy expenditure (TEE) and activity energy expenditure [AEE = 0.9 X TEE - resting metabolic rate (RMR)].Research Methods and Procedures: RMR and energy expenditure (EE) under standardized exercises were measured by indirect calorimetry in 36 adolescents (14 to 19 years old). TEE was measured by the doubly labeled water method, and physical activity was assessed simultaneously with an accelerometer for 14 days. AEE, AEE in relation to body weight (AEE per kilogram), and activity-related time equivalent based on energy expenditure (ArteEE = AEE/[EE reference activity - RMR]) were calculated from laboratory and free-living EE data. ArteACC was calculated as total activity counts/activity counts of reference activity.Results: ArteACC was significantly related to AEE per kilogram (r = 0.57; p < 0.0001) and ArteEE (r = 0.68; p < 0.001). The absolute amount of time (minutes per day) spent in physical activity was significantly lower when calculated from ArteACC than from ArteEE (p < 0.001). TEE was significantly influenced by RMR, sex, and ArteACC (r(2) = 0.89). AEE was significantly influenced by sex and ArteACC (r(2) = 0.59).Discussion: Despite an absolute difference between the two indexes, ArteEE and ArteACC, ArteACC seems to be a valid indicator of free-living physical activity. It contributed significantly, by 3.3% and 12.5%, to the explained variations in TEE and AEE, respectively.