An iPhone application for upper arm posture and movement measurements

作者：Yang Liyun^*; Grooten Wilhelmus J A; Forsman Mikael

来源：Applied Ergonomics, 2017, 65: 492-500.

DOI：10.1016/j.apergo.2017.02.012

• Work-related musculoskeletal disorders
• Accelerometer
• Gyroscope

There is a need for objective methods for upper arm elevation measurements for accurate and convenient risk assessments. The aims of this study were (i) to compare a newly developed iOS application (iOS) for measuring upper arm elevation and angular velocity with a reference optical tracking system (OTS); and (ii) to compare the accuracy of the iOS incorporating a gyroscope and an accelerometer with using only an accelerometer, which is standard for inclinometry. The iOS-OTS limits of agreement for static postures (9 subjects) were -4.6 degrees and 4.8 degrees. All root mean square differences in arm swings and two simulated work tasks were <6.0 degrees, and all mean correlation coefficients were >0.98. The mean absolute iOS-OTS difference of median angular velocity was <13.1 degrees/s, which was significantly lower than only using an accelerometer (<43.5 degrees/s). The accuracy of this iOS application compares well to that of today's research methods and it can be useful for practical upper arm measurements.

• 出版日期2017-11