Abstract
Pain in the shoulder complex affects the working population where work with elevated arms is a risk factor. The aim of the present study was to compare a mobile application for measurements of arm elevation, ErgoExposure, against an existing mobile application, ErgoArmMeter, in a laboratory setting and to test the feasibility in a field trial. Eleven persons performed three tasks in the laboratory setting: static, dynamic, and simulated work tasks, where the applications were validated against an optical tracking system (OTS). Also, ErgoExposure was tested by a teacher in a real-world situation. Limits of agreement for the static task varied between -6.1° to 4.2° (ErgoExposure) and between -7.6° to 5.2° (ErgoArmMeter). The average root mean square difference for dynamic and simulated work tasks was 3.4° (ErgoExposure) and 7.7° (ErgoArmMeter). From the field trial, different work tasks produced distinct exposure variation analysis patterns. Both apps showed similar results compared to OTS, but ErgoExposure was more accurate than ErgoArmMeter.
Highlights
Prevention of harmful biomechanical exposure in working environ ments is a major part of the field of ergonomics
Measurements collected by the optical tracking system (OTS) during the static and simulated work tasks were deleted from one test person
Measure ments collected by the OTS during the dynamic tasks were deleted from one test person
Summary
Prevention of harmful biomechanical exposure in working environ ments is a major part of the field of ergonomics. Musculoskeletal dis orders (MSD) derived from work environments can display heterogeneous symptoms and multiple underlying factors such as biomechanical, psychological, and individual factors, must be consid ered. Statutes pub lished by the Swedish Work Environment Authority require that work with hands at or above the shoulder level should be avoided, if possible, depending on the length, load, and variability of the task [3]. Mathias sen et al [4] conclude that both variation and diversity in work exposure are important to prevent work-related MSD. Variation, in this case, is the change over time, and diversity is how much distinct tasks differ from each other
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