Upper limb dynamic mechanical and anatomical properties among assembly operators.
Sesto-ME; Radwin-RG; Block-WF; Best-TM
Human Factors and Ergonomics Society 47th Annual Meeting. Santa Monica, CA: Human Factors and Ergonomics Society, 2003 Oct; :1265-1268
This study investigated upper limb mechanical and anatomical properties in assembly workers. Fourteen male assembly workers were recruited from selected jobs including power hand tool users and non-power hand tool users. Active dynamical mechanical properties of the upper extremity were measured using a free vibration apparatus. All workers underwent a physical examination, magnetic resonance imaging and completed a symptom survey. Employees were categorized as asymptomatic versus symptomatic based on reported forearm symptoms and physical exam findings. Symptomatic individuals had 46% less mechanical stiffness and a 59% less mass moment of inertia of the forearm than the asymptomatic group. Workers were stratified based on power tool use and two of the seven subjects who regularly used power nut runners demonstrated MRI T2 enhancement, which is indicative of muscle edema. T2MRI enhancement was not demonstrated in the seven subjects who did not regularly use power nut runners.
Ergonomics; Human-factors-engineering; Worker-health; Work-performance; Work-operations; Work-practices; Work-environment; Workplace-studies; Workplace-monitoring; Statistical-analysis; Posture; Body-mechanics; Hand-tools; Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Muscular-disorders; Muscle-tension; Muscle-stress; Muscle-physiology; Muscle-function; Muscle-contraction; Injuries; Injury-prevention; Power-tools; Cumulative-trauma-disorders; Cumulative-trauma; Repetitive-work
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Human Factors and Ergonomics Society 47th Annual Meeting
University of Wisconsin, Department of Biomedical Engineering, Madison, WI