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Development of Step-Count Cut Points for School-Day Vigorous Physical Activity
Ryan D Burns1, Timothy A Brusseau1, You Fu2
1Department of Health, Kinesiology, and Recreation, University of Utah, Salt Lake City, UT, USA.
Biomed Research International
|May 24, 2018
Summary
This study establishes step-count cut points for vigorous physical activity (VPA) in children during the school day. Approximately 5,628 steps accurately identify children meeting 20 minutes of VPA.
Area of Science:
- Pediatric physical activity monitoring
- Exercise science in schools
- Biometric data analysis in children
Background:
- No established step-count cut points exist for accelerometer-assessed vigorous physical activity (VPA) during the school day in children.
- Accurate VPA measurement is crucial for understanding children's health and activity levels.
- School-based physical activity interventions require reliable assessment tools.
Purpose of the Study:
- To establish step-count cut points for discriminating children meeting varying amounts of VPA during a 7-hour school day.
- To provide objective measures for assessing VPA in school settings.
- To aid in the development and evaluation of school-based physical activity programs.
Main Methods:
- Utilized ActiGraph wGT3X-BT accelerometers to measure step counts and VPA in 1,053 children across 5 schools.
- Collected data over multiple semesters, totaling 2,119 observations during a 7-hour school day for one week.
- Employed Receiver Operating Characteristic (ROC) curves and the Youden J statistic to derive optimal step-count cut points.
Main Results:
- Area Under the Curve (AUC) scores indicated good to strong discrimination for VPA levels, ranging from 0.81 for 5 minutes to 0.94 for 20 minutes.
- Approximately 3,460 steps effectively discriminated children meeting at least 5 minutes of VPA (74.1% accuracy).
- Approximately 5,628 steps demonstrated strong discrimination for children meeting at least 20 minutes of VPA (95.1% accuracy).
Conclusions:
- Step counts can effectively discriminate children meeting at least 5 minutes of school-day VPA.
- Step counts provide a strong and accurate method for identifying children who meet 20 minutes of VPA during the school day.
- These findings offer valuable, objective metrics for school-based physical activity research and interventions.
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