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From sedentary time to sedentary patterns: accelerometer data reduction decisions in youth.
Mai J M Chinapaw1, Mark de Niet2, Maïté Verloigne3
1Department of Public and Occupational Health and the EM GO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
Plos One
|November 5, 2014
Summary
Accurate assessment of children's sedentary time requires at least six days of accelerometer data, including one weekend day. A minimum of 60 minutes of consecutive zeros is recommended for identifying non-wear time.
Area of Science:
- Pediatrics
- Physical Activity Epidemiology
- Biomedical Data Analysis
Background:
- Accurate measurement of sedentary time in children is crucial for understanding health behaviors.
- Existing accelerometer data reduction criteria may not optimally capture total sedentary time and patterns.
- Standardized criteria are needed for reliable comparisons across studies.
Purpose of the Study:
- To establish evidence-based accelerometer data reduction criteria for assessing children's sedentary time.
- To determine optimal criteria for non-wear time, minimum daily wear time, and number of valid days.
- To accurately assess total sedentary time and sedentary patterns in children.
Main Methods:
- 1057 European children (9-13 years) wore accelerometers for at least 6 days.
- Explored criteria for non-wear time, minimum daily valid wear time, and number of valid days.
- Compared effects of data reduction decisions on sedentary time and bout characteristics.
Main Results:
- Over 60 consecutive minutes of zero counts was optimal for non-wear time.
- Increasing minimum daily wear time from 8 to 10 hours had minimal impact on sedentary outcomes.
- At least 6 days of data, including one weekend day, were needed for accurate weekly sedentary assessment.
Conclusions:
- Recommend a minimum of 60 minutes of consecutive zeros for non-wear time.
- Advocate for at least six days with a minimum of eight valid hours to characterize usual sedentary time and patterns.
- Emphasize the importance of including a weekend day for comprehensive weekly assessment.
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