Answer:
Proper selection and arrangement of the computer keyboard helps reduce exposure to awkward postures, repetition, and contact stress. The keyboard should sit directly in front of the users. Shoulders should be relaxed and elbows close to the body. Wrists should be straight and in line with the forearms.
Keyboard height
Keyboards, pointing devices (mouse), or working surfaces that are too high or too low can lead to awkward wrist, arm, and shoulder postures. For example, when keyboards are too low you may type with your wrists bent up, and when keyboards are too high, you may need to raise your shoulders to elevate your arms. Performing keying tasks in awkward postures such as these can result in hand, wrist, and shoulder discomfort.
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