Playing With Fire #1
There is a myth that repetitive movement creates repetitive strain injuries. That is false. Improper movement creates strain, fatigue and injury. Over the course of a year I am going to address issues of movement and how it can lead to injury, especially as it pertains to pianists.
With all five fingers together, wave "bye bye." Now abduct your fingers (spread them out) and wave "bye bye." Feel the strain? At the very least, you should feel that your fingers don't move as effortlessly as they did when they were moving together in one direction at a time. This is where computer users, pianists or anyone who uses their hands can go wrong.
When you wave with your fingers together, you are alternating between the flexors and extensors, the muscles in your forearm (your fingers have no muscle) that flex and extend them. Your flexors are designed to move your fingers in one direction and your extensors are designed to move them in the opposite direction. You can not flex and extend at the same time because you can only move your finger bones in one direction. For instance, you can only steer your car left or right, not in both directions at the same time.
However, when you use your abductors at the same time you use your flexors, you are pulling the bone in two directions at the same time and that creates a tug of war or strain to the muscles and more directly to the tendons. You are attempting to move them down but left and right, too.
Most people who experience strain, fatigue, cramps or pain are creating this force vector which can build up scar tissue over time resulting in inflammation to the tendons.
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