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A closer look at the relationship among accelerometer-based physical activity metrics: ICAD pooled data.


ABSTRACT:

Background

Accelerometers are widely used to assess child physical activity (PA) levels. Using the accelerometer data, several PA metrics can be estimated. Knowledge about the relationships between these different metrics can improve our understanding of children's PA behavioral patterns. It also has significant implications for comparing PA metrics across studies and fitting a statistical model to examine their health effects. The aim of this study was to examine the relationships among the metrics derived from accelerometers in children.

Methods

Accelerometer data from 24,316 children aged 5 to 18?years were extracted from the International Children's Accelerometer Database (ICAD) 2.0. Correlation coefficients between wear time, sedentary behavior (SB), light-intensity PA (LPA), moderate-intensity PA (MPA), vigorous-intensity PA (VPA), moderate- and vigorous-intensity PA (MVPA), and total activity counts (TAC) were calculated.

Results

TAC was approximately 22X103 counts higher (p?ConclusionsTAC is mostly explained by MVPA, while it could be more dependent on wear time, compared to MVPA. MVPA appears to be comparable across different wear durations and studies when wear time is ?8?h/day. Due to the moderate to high correlation between some PA metrics, potential collinearity should be addressed when including multiple PA metrics together in statistical modeling.

SUBMITTER: Kwon S 

PROVIDER: S-EPMC6489360 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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A closer look at the relationship among accelerometer-based physical activity metrics: ICAD pooled data.

Kwon Soyang S   Andersen Lars Bo LB   Grøntved Anders A   Kolle Elin E   Cardon Greet G   Davey Rachel R   Kriemler Susi S   Northstone Kate K   Page Angie S AS   Puder Jardena J JJ   Reilly John J JJ   Sardinha Luis B LB   van Sluijs Esther M F EMF   Janz Kathleen F KF  

The international journal of behavioral nutrition and physical activity 20190429 1


<h4>Background</h4>Accelerometers are widely used to assess child physical activity (PA) levels. Using the accelerometer data, several PA metrics can be estimated. Knowledge about the relationships between these different metrics can improve our understanding of children's PA behavioral patterns. It also has significant implications for comparing PA metrics across studies and fitting a statistical model to examine their health effects. The aim of this study was to examine the relationships among  ...[more]

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