Validity of observational posture analysis methods for the wrist and forearm.
Ergonomics in the Digital Age: Proceedings of the XVth Triennial Congress of the International Ergonomics Association, and The 7th Joint Conference of the Ergonomics Society of Korea/Japan Ergonomics Society. Seoul, Korea: Ergonomics Society of Korea, 2003 Aug; :1-4
This study evaluated the accuracy of estimates of working posture made by 28 experienced ergonomists using methods of scaling upper limb posture typical of those reported in the literature. Observational estimates of wrist/forearm posture of four jobs presented on videorecording were compared with posture levels measured directly with an electrogoniometer system. Using categorical scales ergonomists misclassified most frequently occurring posture with probabilities 54% and 70% using a three- and six-category scale respectively, and misclassified peak posture with probabilities 22% and 61% using a three- and six-category scale respectively. This suggests a tradeotTbetween the degree of precision afforded by the categorical scale and the likelihood of posture misclassification. Ergonomists' estimates of the temporal distribution of posture among the categories appeared to be biased towards more neutral postures than were measured for the jobs. This indicates the possibility of a trend towards underestimation of posture duration severity.
Musculoskeletal-system; Ergonomics; Motion-studies; Posture; Musculoskeletal-system-disorders
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Ergonomics in the Digital Age: Proceedings of the XVth Triennial Congress of the International Ergonomics Association, and The 7th Joint Conference of the Ergonomics Society of Korea/Japan Ergonomics Society