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Home-Based Monitor for Gait and Activity Analysis

Home-Based Monitor for Gait and Activity Analysis

Published on: August 8, 2019

ActiGraph™ activity monitors: "the firmware effect".

Dinesh John¹, Jeffer Sasaki, Amanda Hickey

¹1Northeastern University, Boston, MA; and 2University of Massachusetts, Amherst, MA.

Medicine and Science in Sports and Exercise

|September 18, 2013

Summary

This summary is machine-generated.

Firmware version 1.1.0 for ActiGraph monitors showed higher activity counts, especially during sedentary tasks. This highlights the need for rigorous testing of new firmware to ensure consistent data comparability.

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Area of Science:

Wearable sensor technology
Biomedical engineering
Physical activity monitoring

Background:

ActiGraph devices are widely used for objective physical activity assessment.
Variations in device firmware can potentially impact data accuracy.
Ensuring consistency across firmware versions is crucial for reliable research findings.

Purpose of the Study:

To evaluate the impact of different ActiGraph firmware versions on activity count data.
To compare firmware performance across laboratory, free-living, and mechanical shaker tests.
To identify potential discrepancies in data output due to firmware variations.

Main Methods:

Compared activity counts from GT3X and GT1M devices with various firmware versions.
Participants engaged in treadmill activities and simulated free-living tasks.
Mechanical shaker tests were conducted at multiple frequencies.
Statistical analyses included ANOVA and post hoc pairwise comparisons.

Main Results:

Firmware version 1.1.0 on GT1M devices yielded significantly higher vertical counts during slow walking compared to version 1.3.0.
Mechanical shaker tests indicated significant differences in vertical and lateral counts across firmware versions.
Firmware 1.1.0 produced the highest vertical counts during free-living activities, though not statistically significant.

Conclusions:

Firmware version 1.1.0 demonstrated increased sensitivity to low-frequency sedentary activities, leading to higher counts.
ActiGraph should implement both human and mechanical shaker testing before firmware releases.
Verification of output comparability between new and previous firmware versions is recommended.