Correlation Between the Height and the Subjective Discomfort Ratings and Muscle Performance at performing the Lower Arm's Pronation and Supination according to the Changes in Height of Working Table

Abstract

Work related Musculoskeletal Disorders represent chronic health hazards which are usually appeared in hands, wrists, shoulders, neck, shoulder blade, and back by minutely injuring muscles, joints, blood vessels and nerves caused from excessive use of a specific physical part or muscle(1). The work kinds with especially higher potential of musculoskeletal disorders were simply repeating works, heavy material dealing works, hand tool and various machines operating works, VDT work, various assembling works, wrapping works, and poultry and meat processing work(2). Most musculoskeletal disorders are cumulative trauma disorders, meaning the functional injuries in soft physical tissues like muscular tissues.Production workers in industrial or production sites are much exposed to repetitive motions by performing simple repetitive works, and such work environments may become potential factors to insure body parts. Such discomfort working factors are long term influenced on body parts, especially on upper parts like neck, shoulder, arms. In the physical part long term influenced, the musculoskeletal disorders (MSDs) or the cumulative trauma disorders(CTDs) are created with showing ill symptoms like pain,