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Tonic Muscles

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The main movement which is exhibited when using a computer comes from the elbows, wrists and shoulder griddle. Due to the sitting position the majority of the body’s joints and muscles are dormant, except from the triceps and biceps.
When sitting muscles involved in posture are voluntary muscle fibres which are known as tonic and twitch fibres. Tonic fibres enable you to remain sitting upright whilst sitting due to the voluntary muscles being in a state of tension. These fibres are red in colour due to large amounts of myoglobin (oxygen-transporting pigment of muscle) and have slow contraction characteristic which means they contract slowly but are able to keep going for long periods in time. Tonic fibres can also be found in large numbers
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