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Muscle fibres used in sprinting and endurance races.
Most skeletal muscles of the body are a mixture of all three types of skeletal muscle fibres, but their proportion varies depending on the usual action of the muscle. For example, postural muscles of the neck, back, and leg have a higher proportion of type I fibres. ... These muscles have a higher proportion of type I and type II B fibres.
Even though most skeletal muscle are a mixture of all three types of skeletal, all the skeletal muscle fibres of any one motor unit are all the same. In addition, the different skeletal muscle fibres in a muscle may be used in various ways, depending on need. For example, if only a weak contraction is needed to perform a task, only type I fibres are activated by their motor units. If a stronger contraction is needed, the motor units of type II A fibres are activated. If a maximal contraction is required, motor units of type II B fibres are activated as well. ... Although the number of the different skeletal muscle fibres does not change, the characteristics of those present can be altered.
The 100 hundred meters sprint.
The 100 hundred meters sprint is a maximal event an can be over in under 10 seconds, a lot of power and speed needs to be generated by the muscles in this time this is why 100 meter sprint runners use predominantly type 11a and type 11b fibres when they run.
Approximate Word count = 1152
Approximate Pages = 4.6
(250 words per page double spaced)
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