This work leads to a reduction of the blood supply to these tissues, and causes a buildup of waste products, which in turn irritates the tissue, causing inflammation and pain. When muscles, tendons and joints in the arm are doing repetitive motions, such as moving products across the checkout scanner, friction can wear on the tissue and structures, resulting in damage. The body can't repair this damage because muscles contracting in the neck and shoulder area compress blood vessels in the arm. Good posture ensures that muscles will get adequate blood supply. It allows the muscles to eliminate waste, receive vitamins and minerals, and repair damage that might have been caused by stress.
Good posture helps the body work more effectively.
Holding the head straight, not tilted Positioning the head over the neck, not forward when looking down. Don't Slouch Don't Push Your Head Forward Pushing the head forward beyond the plane of the shoulders forces the neck muscles to strain, which restricts blood flow and places spressure on the nerves. This results in headaches and pain in the arm and hands. Holding the head in an awkward or twisted position. Find more about protection from work-related injuries by clicking on one of the links below.