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For most of us, the common desk height of 29" does not provide the possibility of a neutral position. Shoulders are flexed up to raise our forearms to typing height, pinching nerves in our neck and shoulders.Our forearms may be resting on the edge of the desk, causing pain from the sharp edge on the forearm. Wrist rests are generally below the plane of the straight wrists; often the wrists are bent down so that they can rest on the cushion. Flexing the wrist this way can actually aggravate tendons, nerves, and blood vessels in the forearm causing carpal tunnel syndrome, tendonitis, and similar painful conditions.
There are a number of accommodations that we can make for a more neutral typing and mousing position. Starting at the top, our shoulders should be relaxed. Elbows should describe a 90-degree angle and be close to our side. The wrists should be straight from the elbow to the fingertips.
For most people, a typing/mousing height of less than 29" is the preferred or more neutral position. An adjustable keyboard tray allows us to make an adjustment to a height, which will allow us to relax our shoulders and maintain a neutral typing/ mousing posture. A good adjustable keyboard tray accommodates the keyboard and mouse and provides for easy vertical adjustment, angle adjustment, and can easily be slid under the worksurface when not in use.
For taller individuals, a keyboard tray that allows for adjustment above the worksurface may be needed to achieve the proper height for neutral shoulder and forearm postures. All Neutral Posture keyboard trays offer this "Sit/Stand" arm as an option.
A Dual Swivel arm is also available that allows the tray to pivot at both ends which gives computer users the ability to keep their keyboard centered in front of them even if they arent centered on their desk.
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