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Physical Activity Measurement in Children Accepting Table Tennis Training

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Published on: July 27, 2022

Validation and comparison of ActiGraph activity monitors.

Jeffer E Sasaki¹, Dinesh John, Patty S Freedson

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

Journal of Science and Medicine in Sport

|May 28, 2011

Summary

Activity monitors ActiGraph GT3X and GT1M show differences in antero-posterior and vector magnitude counts, but not vertical counts. New tri-axial vector magnitude cut-points are proposed for classifying physical activity intensity.

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Area of Science:

Biomedical Engineering
Exercise Physiology
Wearable Technology

Background:

ActiGraph devices are widely used for objective physical activity assessment.
Comparing data between different ActiGraph models (GT1M and GT3X) is crucial for data consistency.
Accurate classification of physical activity intensity is essential for health research.

Purpose of the Study:

To compare activity counts between ActiGraph GT3X and GT1M during treadmill walking/running.
To develop tri-axial vector magnitude (VM3) cut-points for classifying physical activity intensity.

Main Methods:

Fifty participants performed treadmill exercise at four speeds (4.8-12 km/h) wearing both GT3X and GT1M devices.
Vertical (VT), antero-posterior (AP) counts, and 2-axis vector magnitude (VM2) were analyzed using two-way ANOVA.
Bland-Altman plots assessed inter-monitor agreement; linear regression developed VM3 cut-points based on oxygen consumption.

Main Results:

No significant differences in VT activity counts between monitors.
AP and VM2 counts were significantly higher (p<0.01) from GT1M than GT3X at most speeds.
High agreement for VT counts, but not for AP and VM2 counts.
Proposed VM3 cut-points: moderate (2690-6166), hard (6167-9642), very hard (>9642) counts/min.

Conclusions:

Direct comparison of GT1M and GT3X data is not recommended when using AP or VM2 axes due to lack of congruence.
The developed VM3 cut-points offer a standardized method for classifying physical activity intensity in future research.