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Muscular fibres can be divided into three broad families: The fast fibres: used for short efforts and highly fatigable, they work exclusively under anaerobic conditions They use the oxygen and glycogen they have stored. They are used in bodybuilding during short series. The intermediate fibres: determine a capacity for resistance, such as 400 m to 1000 m in athletics. They are not sufficiently powerful for 100 m, nor sufficiently enduring for 10 000 m. The slow fibres: also known as red fibres, they capture oxygen coming directly from the lungs, they have no reserve, this is the typical fibre of the marathon runner. The type of fibre found in any particular individual depends purely on genetic considerations. You do not choose to be a track racer or a climber, a long jumper or a triathlete. Deficiencies in a particular type of fibre can be improved through training, but always at the expense of the primary qualities. The results are generally disappointing since you cannot turn a carthorse into a steeple-chaser. |
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