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Updated: Jun 16, 2026

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
07:24

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers

Published on: April 21, 2017

Assessing physical activity in persons with rheumatoid arthritis using accelerometry.

Pamela Semanik1, Jing Song, Rowland W Chang

  • 1Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, Chicago, IL, USA. p-semanik@northwestern.edu

Medicine and Science in Sports and Exercise
|February 9, 2010
PubMed
Summary
This summary is machine-generated.

For rheumatoid arthritis (RA) patients, a 90-minute nonwear threshold and a 10-hour wear day are recommended for accelerometer data. This ensures accurate physical activity measurement in RA research.

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Area of Science:

  • Biomedical Engineering
  • Rheumatology
  • Physical Activity Measurement

Background:

  • Accelerometer data is crucial for assessing physical activity in various populations.
  • Standard definitions for accelerometer data processing, including nonwear thresholds and valid day criteria, are established for the general adult population.
  • The applicability of these standard definitions to specific clinical populations, such as individuals with rheumatoid arthritis (RA), requires empirical investigation.

Purpose of the Study:

  • To determine if existing nonwear thresholds and valid day definitions for accelerometer data are suitable for individuals with rheumatoid arthritis (RA).
  • To empirically assess and potentially refine these parameters for more accurate physical activity monitoring in RA research.

Main Methods:

  • Analysis of accelerometer data from 107 individuals with RA.
  • Examination of various nonwear thresholds (20-300 minutes of zero activity count).
  • Evaluation of the impact of different nonwear thresholds and valid day definitions (8-12 hours wear time) on key metrics like daily activity counts and moderate-to-vigorous physical activity (MVPA).

Main Results:

  • Increasing the nonwear threshold positively correlated with average daily wear hours.
  • A nonwear threshold of 90 minutes stabilized the mean number of non-zero activity count minutes.
  • Defining a valid day as at least 10 hours of wear time, with a 90-minute nonwear threshold, classified 92.8% of collected days as valid.

Conclusions:

  • The findings support adjusting the nonwear threshold for accelerometer data in RA patients from 60 minutes to 90 minutes.
  • Retaining the 10-hour wear time definition for a "valid day" is recommended for RA populations.
  • These adjustments enhance the reliability of physical activity data in RA research.