Wrist motions in industry: variance between jobs and subjects.
Schoenmarklin RW; Marras WS
Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting, October 11-15, 1993, Seattle, Washington, Designing for Diversity. Santa Monica, CA: Human Factors and Ergonomics Society, 1993 Oct; 37(Ind Erg):649-653
This study attempted to quantify the amount of variance of wrist motions performed by industrial workers within jobs. Forty healthy persons volunteered to participate in the study in which the only independent variable was exposure to cumulative trauma disorders in selected jobs at participating companies. Within each risk level, ten highly repetitive, hand intensive jobs were randomly selected. A wrist monitor was developed that collected on line data on wrist angle in the radial/ulnar (R/U) and flexion/extension (F/E) planes simultaneously. The position and angular velocity and acceleration of these workers' wrists were measured in all three planes, R/U, F/E and pronation/supination with goniometry. For all the kinematic variables, the variance between subjects within jobs accounted for a substantial amount of the variance. The authors conclude that ergonomists must consider the variability in motion patterns which exist between workers when redesigning existing or designing new jobs. Researchers should monitor at least two subjects per job in quantitative surveillance studies of wrist motion.
NIOSH-Grant; Musculoskeletal-system-disorders; Repetitive-work; Human-factors-engineering; Assembly-line-workers; Ergonomics; Epidemiology; Cumulative-trauma-disorders
Industrial and Systems Engr Ohio State University 1971 Neil Avenue Columbus, Ohio 43210
Issue of Publication
Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting, October 11-15, 1993, Seattle, Washington, Designing for Diversity
Ohio State University, Columbus, Ohio