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Comparison between two mobile applications measuring shoulder elevation angle-A validity and feasibility study.

Fredrik Öhberg1, Mårten Vänn1, Karolina Jonzén1

  • 1Dept. of Radiation Sciences, Biomedical Engineering, Umeå University, Umeå, Sweden.

Medical Engineering & Physics
|December 1, 2021
PubMed
Summary

A new mobile app, ErgoExposure, accurately measures arm elevation in workers, outperforming the existing ErgoArmMeter. This tool helps assess occupational risks for shoulder pain caused by elevated arm work.

Keywords:
BiomechanicsErgonomicsMobile phone

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Area of Science:

  • Occupational health and ergonomics
  • Biomechanics
  • Digital health technologies

Background:

  • Shoulder complex pain is prevalent in the working population.
  • Work involving elevated arm postures is a significant risk factor for shoulder pain.
  • Accurate measurement of arm elevation is crucial for assessing occupational exposure.

Purpose of the Study:

  • To compare the accuracy of a new mobile application, ErgoExposure, against an existing application, ErgoArmMeter, for measuring arm elevation.
  • To validate these mobile applications against an optical tracking system (OTS) in a laboratory setting.
  • To assess the feasibility and performance of ErgoExposure in a real-world field trial.

Main Methods:

  • Laboratory validation using static, dynamic, and simulated work tasks with 11 participants.
  • Comparison of mobile application measurements against an optical tracking system (OTS).
  • Field trial involving a teacher performing real-world work tasks using ErgoExposure.

Main Results:

  • ErgoExposure demonstrated higher accuracy than ErgoArmMeter, with limits of agreement for static tasks of -6.1° to 4.2° (ErgoExposure) vs. -7.6° to 5.2° (ErgoArmMeter).
  • The average root mean square difference for dynamic and simulated tasks was 3.4° for ErgoExposure and 7.7° for ErgoArmMeter.
  • Field trial data revealed distinct exposure variation patterns for different work tasks, highlighting ErgoExposure's utility.

Conclusions:

  • ErgoExposure is a more accurate mobile application for measuring arm elevation compared to ErgoArmMeter.
  • The study validates the use of mobile applications for quantifying arm elevation exposure in occupational settings.
  • ErgoExposure shows promise for assessing and mitigating risks associated with elevated arm work to prevent shoulder pain.