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Accuracy and validity of observational estimates of shoulder and elbow posture.

Authors
Lowe-BD
Source
Appl Ergon 2004 Mar; 35(2):159-171
NIOSHTIC No.
20024732
Abstract
This study investigated the accuracy of video-based observational posture analysis for the elbow and shoulder. Posture analyses were conducted by 28 ergonomists for four jobs presented on a traditional VHS format video recording. Estimates of posture from the observational-based methods were compared with values measured directly with an optical motion capture system. Ergonomists used categorical posture scales and a continuous visual analog scale to estimate the peak and most frequently occurring or average posture for each job. Use of a three-category scale resulted in misclassifications of peak and most frequently occurring elbow and shoulder posture with a probability averaging 30.1%. With the six-category posture scale this average probability of misclassification increased to 64.9%. Using a continuous visual analog scale peak shoulder elevation was the only posture for which the average error among ergonomists' estimates was significantly different from zero [Formula: see text]. Correlations between the estimated postures and measured postures were higher and statistically significant [Formula: see text] for elbow flexion and shoulder elevation ( [Formula: see text] between 0.45 and 0.66) but were considerably lower and not significant ( [Formula: see text] between 0.03 and 0.18) for the peak and average horizontal shoulder abduction. Ergonomists' estimates of the temporal distribution of shoulder posture, indicating the duration severity of the posture, appeared to be biased such that the percentage of the cycle time in each posture category was estimated as more uniformly distributed than the measured values indicated.
Keywords
Musculoskeletal-system; Ergonomics; Motion-studies; Posture; Musculoskeletal-system-disorders; Electronic-equipment; Analytical-instruments; Visual-motor-performance; Optical-aids
Contact
National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-24, Cincinnati, OH 45226
CODEN
AERGBW
Publication Date
20040301
Document Type
Journal Article
Email Address
blowe@cdc.gov
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
0003-6870
NIOSH Division
DART
Source Name
Applied Ergonomics
State
OH
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