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Updated: Jul 9, 2026

Methodology for Establishing a Community-Wide Life Laboratory for Capturing Unobtrusive and Continuous Remote Activity and Health Data

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Published on: July 27, 2018

Youth Oriented Activity Trackers: Comprehensive Laboratory- and Field-Based Validation.

John R Sirard¹, Brittany Masteller¹, Patty S Freedson¹

¹Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, United States.

Journal of Medical Internet Research

|July 21, 2017

Summary

The Sqord (SQ) activity tracker showed better validity in measuring children's physical activity intensity compared to Movband (MB) and Zamzee (ZZ). This research highlights the need for accurate youth activity trackers for behavior change.

Keywords:

child fitness trackers movement

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Published on: February 21, 2025

Area of Science:

Pediatric physical activity monitoring
Wearable technology validation
Exercise science and public health

Background:

Commercial activity trackers are increasingly popular, with some marketed to children.
Independent research on the validity of these devices for children's physical activity is limited.
Accurate measurement of physical activity intensity is crucial for health interventions.

Purpose of the Study:

To evaluate the validity of three commercial youth activity trackers: Movband (MB), Sqord (SQ), and Zamzee (ZZ).
To assess tracker accuracy across different physical activity intensities and in free-living conditions.
To compare tracker performance against a research-grade accelerometer (ActiGraph GT3X+) and energy expenditure measurements.

Main Methods:

Three phases of testing: orbital shaker, structured indoor activities, and 4-day free-living monitoring.
Participants were children aged 6-12 years.
Compared tracker output with ActiGraph GT3X+ and indirect calorimetry.

Main Results:

All devices showed strong correlation with oscillation frequency in the shaker test (r=.92-.99).
Sqord (SQ) accurately differentiated all physical activity intensities, unlike Movband (MB) and Zamzee (ZZ) which only distinguished sedentary from light activity.
ActiGraph GT3X+ counts correlated well with tracker output in free-living conditions (r=.59-.86).

Conclusions:

Sqord (SQ) demonstrated superior validity compared to Movband (MB) and Zamzee (ZZ) across study phases.
The accuracy of youth activity trackers is critical for their effectiveness as behavior modification tools.
Further research is needed to ensure the reliability of devices used for monitoring children's physical activity.