Exposure assessment of biomechanical stress in repetitive manual work using frequency-weighted filters.
Radwin-RG; Lin-ML; Yen-TY
Ergonomics 1994 Dec; 37(12):1984-1998
A method was developed for the measurement of exposure to physical stress stress associated with manual labor. Continuous biomechanical data from electrogoniometers or force sensors were used. The method was able to reduce the biomechanical data into a metric corresponding to recognized exposure factors which included repetitive motion, stress due to posture and duration of the effort being made. The method was used to measure whether frequency weighted filters can be established based on short term psychophysical responses to repetitive motion stress at different movement amplitudes and frequencies. Filtered wrist motion measurements were shown to be proportional to localized forearm discomfort in a simple repetitive wrist flexion task. The task was designed to be similar to those often performed in industrial operations. The authors conclude that frequency weighted filters corresponding to discomfort responses associated with controlled movements at specific frequencies and amplitudes can be developed applied to measure exposure to repetitive motion. They note that, although the tests designed in this study were limited to wrist flexion motion and localized discomfort, the theory is likely applicable to motion measured at articulations other than the wrist.
NIOSH-Publication; NIOSH-Grant; Musculoskeletal-system-disorders; Repetitive-work; Human-factors-engineering; Ergonomics; Physical-exercise; Job-stress; Epidemiology; Risk-factors; Biomechanics; Analytical-models;
Author Keywords: Cumulative trauma; Electrogoniometer; Localized discomfort; Musculoskeletal disorders; Psychophysics; Repetitive strain
Industrial Engineering Univ of Wisconsin-Madison 1513 University Ave Madison, WI 53706
University of Wisconsin Madison, Madison, Wisconsin