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RSI is no small matter.  It accounts for 34% of all lost-workday injury and illness — and costs almost $20 billion annually, according to the Bureau of Labor Statistics. The National Academy of Sciences has concluded that an estimated $50 billion is lost by businesses every year from sick leave, decreased productivity and medical costs linked to repetitive stress disorders. The Academy has published two reports since 1998 which directly link repetitive motion to workplace injury.
The damage sustained from RSI is due to structural changes in the muscle fiber as well as due to decreased blood flow. Nerves can also be involved. The immobile tissue and surrounding inflammation compress the nerve which can cause numbness or tingling and eventually weakness if the nerve is damaged severely.
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