Research Database

12 results for "Wear time"

The Impact of Low Accelerometer Wear Time on the Estimates and Application of Sedentary Behavior and Physical Activity Data in Adults

  • Published on Dec 1, 2017

Background: This investigation sought to determine how accelerometer wear (1) biased estimates of sedentary behavior (SB) and physical activity (PA), (2) affected misclassifications for meeting the Physical Activity Guidelines for Americans, and (3) impacted the results of regression models examining the association between moderate to vigorous physical activity (MVPA) and a clinically relevant ...


Daily physical activity patterns from hip- and wrist-worn accelerometers

  • Published on Sep 21, 2016

Accelerometer wear location may influence physical activity estimates. This study investigates this relationship through the examination of activity patterns throughout the day. Participants from the aging research evaluating accelerometry (AREA) study (n men  =  37, n women  =  47, mean age (SD)  =  78.9 (5.5) years) were asked to wear accelerometers in a free-living environment for 7 d ...


Accelerometer Data Collection and Processing Criteria to Assess Physical Activity and Other Outcomes: A Systematic Review and Practical Considerations

  • Published on March 16, 2017

Background: Accelerometers are widely used to measure sedentary time, physical activity, physical activity energy expenditure (PAEE), and sleep-related behaviors, with the ActiGraph being the most frequently used brand by researchers. However, data collection and processing criteria have evolved in a myriad of ways out of the need to answer unique ...


Improving wear time compliance with a 24-hour waist-worn accelerometer protocol in the International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE)

  • Published on Feb. 11, 2015

Background: We compared 24-hour waist-worn accelerometer wear time characteristics of 9–11 year old children in the International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE) to similarly aged U.S. children providing waking-hours waist-worn accelerometer data in the 2003–2006 National Health and Nutrition Examination Survey (NHANES). Methods: Valid cases were defined ...


Maximizing the detection of youth sedentary behavior with accelerometer data

  • Presented on May 21, 2014

Purpose: Accelerometers are commonly used as an objective measure of sedentary behavior, but the method of defining nonwear time directly affects sedentary estimates. The present study examined nonwear definitions and their impact on detection of sedentary time in youth using different ActiGraph models and filters. Methods: 60 youth (34 children and 26 adolescents; ...




Assessment of accelerometer non-wear time in children

  • Presented on May 21, 2014

Purpose: Different definitions for determining non-wear time are currently used. The aim of this study was to determine the effect of the definition of ActiGraph and activPAL non-wear time on data retention and the classification of sedentary and sitting time in children. Methods: Accelerometer and inclinometer data were drawn from ...


Impact Of Accelerometer Data Processing Decisions On Data From Large Cohort Studies

  • Presented on May 30, 2014

Background: Accelerometers objectively assess physical activity (PA) and are increasingly used in epidemiologic studies. However, processing techniques are not standardized and limit data comparability across studies. Purpose: To compare the impact of wear-time assessment method and filter choice on accelerometer output in a large cohort. Methods: Participants (7,650 women, mean age 71.4...


Quality Control Methods in Accelerometer Data Processing: Defining Minimum Wear Time

  • Published on June 24, 2013

Background: When using accelerometers to measure physical activity, researchers need to determine whether subjects have worn their device for a sufficient period to be included in analyses. We propose a minimum wear criterion using population-based accelerometer data, and explore the influence of gender and the purposeful inclusion of children with ...