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Measuring Reliability of Movement With Accelerometry: Fitbit® Versus ActiGraph®.

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Summary
This summary is machine-generated.

The Fitbit Flex and ActiGraph monitor upper extremity (UE) activity similarly. However, the Fitbit is less sensitive, recording fewer movements than the ActiGraph, impacting its clinical utility.

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Movement Science

Background:

  • Accelerometry is crucial for measuring upper extremity (UE) movement.
  • Wearable devices like Fitbit offer accessible activity monitoring.
  • Validating consumer-grade devices against research-grade monitors is essential for clinical utility.

Purpose of the Study:

  • To compare the reliability of the Fitbit Flex with the ActiGraph wGT3X-BT for measuring UE movement.
  • To assess the clinical utility of Fitbit accelerometry for UE activity.

Main Methods:

  • Two studies involved healthy adults wearing both Fitbit Flex and ActiGraph monitors on wrists.
  • Participants engaged in everyday activities for 24 hours (Study 1) or 4 hours during an active period (Study 2).
  • Data from both devices were analyzed for correlation and differences in movement detection.

Main Results:

  • A high positive correlation was observed between Fitbit and ActiGraph data.
  • The Fitbit Flex recorded significantly fewer upper extremity movements compared to the ActiGraph wGT3X-BT.
  • Despite correlation, sensitivity differences were noted.

Conclusions:

  • The Fitbit Flex and ActiGraph demonstrate similar patterns in measuring UE activity.
  • The Fitbit Flex is less sensitive than the ActiGraph in detecting movements.
  • Findings provide insights into the clinical utility of Fitbit for UE activity monitoring.