This is the force used to hammer a nail, for example. Although no one really knows when RMIs will develop, workers performing forceful movements are at risk. Work involving forceful movements is very tiring again because there is not time for a full recovery between movements. Eventually it takes effort to perform the same task. When the work activity continues in spite of the developing fatigue, injuries occur.
Vibration affects tendons, muscles, joints and nerves.
Workers can be exposed to either whole body vibration or localized vibration. Whole body vibration is experienced by truck and bus drivers for example. Localized vibration exposure can be caused by power tools. In addition the worker may use more force and awkward body positions because vibration hand tools are harder to control. Exposure to too much vibration can also cause us to lose the feeling in our hands and arms.