This is one of the adaptations to make in order to work with a traditional mouse or keyboard: rotated forearms.
| Adaptation: | The forearms must rotate, enabling the palms of the hands to face downwards. In medical terms this movement is referred to as pronation. | | Threat: | If we want to maintain this posture for a longer period of time, we are forced to use muscle action, otherwise our arms will passively move back to a more neutral position. The required, continuous contraction puts a lot of stress on the muscles that contribute to the movement. This continuous activity will have negative effects on the blood flow of the active muscle tissue. One of the more important nerves running through our arms is located right under the M. Supinator, a major pronating muscle. Prolonged muscle activity might cause increased pressure on that medial nerve, which can result in loss of nerve conduction, or even complete blockage. | | Symptoms: | Muscle tissue: pain, stiffness and early fatigue. Nerve tissue: 'pins and needles', loss of hand coordination and loss of strength. |
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