Unfortunately, there is no 'best' angle, it depends on the person and there are multiple considerations. This puts a static load and strain on the joints, muscles and membranes in the arm which can lead to fatigue, discomfort, pain or injury. When you are forced to maintain your hands horizontally (parallel to the keyboard), the posture is called pronation. If you look your hands frontally, the neutral position for the forearm and wrist is vertical. The Shortcut is a split keyboard, composed by two different independent pieces, so you can move and turn each part until your hands are perfectly aligned with your forearms in a neutral angle. Ideally, in a neutral position your hand should be aligned with your forearms, but with regular keyboards you are forced to break this neutral angle constantly to type. When typing on a keyboard, ulnar deviation depends of the relation of the width of the shoulders width and the space between hands as you have to reach the keys. It can cause pain and discomfort, as well as impingement and damage of the ulnar nerve, causing Guyon’s Canal Syndrome and other serious injuries. Ulnar deviation, or bending the wrist sideways, also creates some static loading conditions in the hand muscles and in the forearm as well. The Shortcut helps you to maintain this neutral angle by adjusting the wrist (adjusting the palm rest height and depth), and reducing significantly the number of movements needed to type. To avoid those injuries, you should keep a neutral angle between hand and forearm with your muscles as relaxed as possible. It increases the pressure in the carpal tunnel, which can lead to significant inflammation and compression in the median nerve, causing the well known Carpal Tunnel Syndrome and other injuries. This wrist posture creates static loading conditions in the muscles crossing the wrist. One of the most common injuries is caused by increasing the angle of the wrist upward during typing also known as wrist extension. The hand-wrist articulation is a very complex one, with a widerange of movements and lots of potential injuries caused by awkward positions and repeated movements. Ĭomputer users end up having injuries caused by bad ergonomic posture and non-natural repetitive hand movement with their regular keyboard. Basically, the more hours you stay in front of the computer the more likely you are to be injured. This can be avoided by using specific ergonomic devices like the Shortcut. This is Part 2 of a series on ergonomics (read the Part 1 here) where w e explaining the different injuries caused by bad positions, and how can you prevent them by using the Shortcut.
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