Related Experiment Video
Updated: Oct 1, 2025
Physical Activity Measurement in Children Accepting Table Tennis Training
Published on: July 27, 2022
Comparing estimates of physical activity in children across different cut-points and the associations with weight
Marja H Leppänen1,2, Jairo H Migueles3,4, Anna M Abdollahi1,5
1Folkhälsan Research Center, Helsinki, Finland.
Insights
Estimates of sedentary time and physical activity in preschoolers vary widely based on accelerometer cut-points, impacting comparisons and health associations. Standardized methods are needed for reliable research.
Area of Science:
- Pediatric physical activity research
- Biometric data analysis
- Public health surveillance
Background:
- Accurate measurement of sedentary time (SED) and physical activity (PA) is crucial for understanding child health.
- Different accelerometer cut-point methods yield varying estimates, hindering cross-study comparisons.
- Preschoolers' health is influenced by SED and PA levels, but measurement inconsistencies pose challenges.
Purpose of the Study:
- To compare SED and intensity-specific PA estimates using three common cut-point sets in preschool children.
- To examine the associations between SED, PA, and body mass index (BMI) and waist circumference (WC) across these cut-points.
- To assess the prevalence of meeting physical activity recommendations based on different cut-points.
Main Methods:
- 751 preschool children (4.7 ± 0.9 years) wore accelerometers for 7 days.
- Sedentary time (SED) and physical activity (PA) intensity (light, moderate, vigorous, MVPA) were calculated using Hildebrand, Butte, and Evenson cut-points.
- Associations with BMI and WC were analyzed using multilevel mixed-effects models.
Main Results:
- SED and PA estimates varied significantly across cut-points (e.g., SED: 22-341 min/day; MVPA: 13-35 min/day).
- The proportion of children meeting PA recommendations ranged dramatically from 4% to 70% depending on the cut-point.
- Associations between SED/PA and BMI/WC differed based on the chosen cut-point method.
Conclusions:
- Accelerometer-derived SED and PA estimates in preschool children are not comparable across different cut-point methodologies.
- Current cut-point variations limit the ability to draw consistent conclusions about children's activity behaviors and their health implications.
- Development of standardized methods for accelerometer data analysis is essential for reliable research and public health guidance.
Abstract:
This study aimed to compare sedentary time (SED) and intensity-specific physical activity (PA) estimates and the associations of SED and PA with body mass index (BMI) and waist circumference (WC) using three different sets of cut-points in preschool-aged children. A total of 751 children (4.7 ± 0.9 years, boys 52.7%) wore an ActiGraph GT3X+BT accelerometer on their hip for 7 days (24 h). Euclidean norm -1 G with negative values rounded to zero (ENMO) and activity counts from vertical axis (VACounts) and vector magnitude (VMCounts) were derived. Estimates of SED and light, moderate, vigorous, and moderate-to-vigorous PA (MVPA) were calculated for commonly used cut-points by Hildebrand et al., Butte et al., and Evenson et al. Furthermore, the prevalence of meeting the PA recommendation, 180 min/day of which at least 60 min/day being MVPA, were assessed for the cut-points. Multilevel mixed analysis was used to examine associations of SED and PA with BMI and WC. In accordance with the results, SED and PA intensity estimates differed largely across cut-points (i.e., SED = 22-341 min/day; light PA = 52-257 min/day; moderate PA = 5-18 min/day; vigorous PA = 7-17 min/day; MVPA = 13-35 min/day), and the prevalence of children meeting the PA recommendation varied from 4% to 70%. Associations of SED and PA with BMI or WC varied between the cut-points. Our results indicate that SED and PA estimates in preschool-aged children between studies using these cut-points are poorly comparable. Methods facilitating accelerometer-derived PA estimate comparison between studies are highly warranted.
