Repetitive movement uses the same body parts for similar movements over time, for example painting, packing from a conveyor, keyboard work, electronics assembly and ratcheting. A neutral posture has the trunk and head upright and forward facing, arms by the sides, forearms hanging or at right angles to the upper arm and hands in the handshake position, though no single posture suits all tasks. Sustained posture keeps part or all of the body in the same position for a long time, such as supporting plasterboard, standing mainly on one leg at a foot pedal press or prolonged sitting. Awkward posture is any uncomfortable or unnatural position, such as asymmetrical postures, extreme joint angles, bending and twisting, squatting, arms overhead, kneeling, a bent wrist or bending the neck to see around bulky items. Postures that are both awkward and sustained are particularly hazardous.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.