Are pedometers adequate instruments for assessing energy expenditure?
Are pedometers adequate instruments for assessing energy expenditure?
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DOI：
10.1038/ejcn.2009.108
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发表时间：
2009-12-01
影响因子：
4.7
通讯作者：
Schutz, Y.
中科院分区：
文献类型：
--
作者：
Kumahara, H.;Tanaka, H.;Schutz, Y.
目的：评价能量消耗（EE）对控制肥胖具有重要意义。每日步数已成为流行的，并构成一个实用的技术，用于评估身体活动（PA）在大规模人群的研究。然而，计步器跟踪EE在自由生活的conditions.Subjects和方法的能力的信息仍然scarpty. The 24小时EE的71名健康成年人间接测热法在一个大的呼吸室。两个加速度计连接到腰部，一个用于计算每天的总步数（ACC（STEP）），另一个用于测量前后全身加速度，计算为每秒加速度信号的均方根（ACC（RMS））。ACC（STEP）与PA相关EE（PAEE）或24小时EE无关。体重（BW）是这两个值的主要决定因素（分别解释30%和75%的方差）。在考虑BW后，PAEE中约8%（P < 0.001）的方差归因于ACC（RMS），而ACC（STEP）不能解释任何额外的方差。多元逐步回归分析显示，体重，身高和ACC（RMS）是非常显着的24小时EE的决定因素，并占高达83%的总variance.Conclusions：记录每天的步骤数不提供准确的信息EE，充其量只是一个粗略的预测一般PA的位移。相比之下，加速度计信号被认为是评估EE的更有意义的因素，而不是久坐条件下的步数。欧洲临床营养学杂志（2009）63，1425-1432; doi：10.1038/ejcn.2009.108; 2009年8月26日在线发表
Objective: Assessing energy expenditure (EE) is important for the control of obesity. Daily step counts have become popular and constitute one practical technique for evaluating the physical activity (PA) in large population studies. However, information on the capacity of pedometers to track EE in free-living conditions remains scanty.Subjects and methods: The 24-h EE of 71 healthy adults was measured by indirect calorimetry in a large respiratory chamber. Two accelerometers were attached to the waist, one for counting the total daily steps (ACC(STEP)) and another for measuring the anteroposterior whole body acceleration calculated as the root mean square of the acceleration signal at every second (ACC(RMS)).Results: The ACC(STEP) was not associated with PA-related EE (PAEE) or 24-h EE. Body weight (BW) was the main determinant of both the values (explaining 30 and 75% of the variance, respectively). Approximately 8% (P < 0.001) of the variance in PAEE was attributed to the ACC(RMS) after BW was accounted for, whereas the ACC(STEP) did not explain any additional variance. A multiple stepwise regression analysis revealed that BW, height and ACC(RMS) were highly significant determinants of 24-h EE and accounted for as much as 83% of the total variance.Conclusions: Recording the number of steps per day does not provide accurate information on EE, and at best is only a crude predictor of the general PA in terms of displacement. In contrast, accelerometry signals are considered to be a more meaningful factor in the assessment of EE rather than step counts under sedentary conditions. European Journal of Clinical Nutrition (2009) 63, 1425-1432; doi:10.1038/ejcn.2009.108; published online 26 August 2009