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Establishing wrist-based cutpoints for the Actical accelerometer in elementary school-aged children
Christine Adele Schaefer1, Heidi Nace, Ray Browning
1Dept of Health and Exercise Science, Colorado State University, Fort Collins, CO.
Journal of Physical Activity & Health
|March 16, 2013
Summary
This study established wrist-based accelerometer cutpoints for children, finding that different calibration methods yield varying estimates of moderate to vigorous physical activity (MVPA). Standardized calibration is needed for accurate physical activity measurement.
Area of Science:
- Pediatric physical activity monitoring
- Biomedical engineering
- Exercise physiology
Background:
- Wrist accelerometry is common for physical activity monitoring in children, but lacks calibration studies.
- Interpreting wrist-based accelerometer data is challenging due to limited validation.
Purpose of the Study:
- To establish cutpoints for wrist-mounted Actical accelerometers in children aged 6-11 years.
- To compare two calibration methods (Linear Regression and Receiver Operator Characteristics) for accelerometer data.
Main Methods:
- Collected metabolic and accelerometry data during 8 activities in 22 children (ages 6-11).
- Used Linear Regression (LR) and Receiver Operator Characteristics (ROC) to determine cutpoints for sedentary, light, moderate, and vigorous activity.
- Applied established cutpoints to a larger sample (n=269) to assess differences in moderate to vigorous physical activity (MVPA) estimates.
Main Results:
- LR and ROC methods produced moderate cutpoints of 574 and 388 counts, respectively.
- Application to a larger sample estimated 83 minutes of daily MVPA using LR cutpoints and 140 minutes using ROC cutpoints.
Conclusions:
- Established wrist-mounted Actical cutpoints for children using two distinct methods.
- Significant differences in MVPA estimates highlight challenges in cutpoint establishment.
- Recommended the development of standardized calibration procedures for wrist accelerometers in pediatric populations.
