Thirty years on keyboards led to bad tendonitis in my thumb, but a motorcycle accident several years ago tore the tendon and it healed better than before!
However now, after long sessions coding or typing, if I go do something else repetitive the nerve in my elbow hurts. Sadly that is mostly when I go from the keyboard to a pinball game, so I cannot play that as much as I'd like.
I have found that stiffer springs help, so Model M, Browns or Greens are better than softer keyswitches, and even the tactile Gray for the spacebar helps. Keeping my wrists up off the desk helps, so typically I type with my forearms on the edge of the desk and my hands hovering above the board.
(This message was typed on a Leopold TKL with Cherry Brown switches and double-shot Red Alert alphas and thick PBT mods. This is my most comfortable keyboard made since the turn of the century, and is not as loud as my Model M or the QFR with Greens, so I can use it at home.)
- Ron | samwisekoi
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Proper technique helps me as well. I have added a large gel wrist pad for the keyboard, and a sliding wrist wrest for the mouse. These have helped quite a bit.
I like this mouse wrist wrest. It allows me to move my whole arm around rather than just bending my wrist:
http://www.zumaoffice.com/Products/Wrist-Assist-Memory-Foam-Ergonomic-Wrist-Rest--Black__ASP29538.aspx?utm_medium=shoppingengine&utm_source=googlebase&cvsfa=3375&cvsfe=2&cvsfhu=4153503239353338&gclid=CNW12NSOurcCFcuh4AodgEwAKw (http://www.zumaoffice.com/Products/Wrist-Assist-Memory-Foam-Ergonomic-Wrist-Rest--Black__ASP29538.aspx?utm_medium=shoppingengine&utm_source=googlebase&cvsfa=3375&cvsfe=2&cvsfhu=4153503239353338&gclid=CNW12NSOurcCFcuh4AodgEwAKw)