The white fibres, also known as the slow fibres, use fats as fuel, they are very resistant when it comes to effort and they recover fast once the activity is interrupted. On the other hand, the red fibres or the fast ones use glycogen as fuel, this substance being deposited in the muscles, but the amount deposited is quite small. We are talking about two thousand calories with a very well-trained sportsman. Now, let's just imagine that we have to put wood on the fire. We have thick pieces which burn slowly and fur tree branches which burn fast, but also make an impressive flame. We use the wood depending on how we want the fire to burn. Training session allow cyclists to extend their wood warehouse. The short tours allow them to use the red fibres and the long ones require the white ones. Finally, everything is just as it should be as long as the warehouse is not empty.
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