Exercise and muscle fibre type Flashcards
Let’s now turn our attention to the long-term effects of exercise on different types of muscle fibre.
Aerobic activities, such as jogging, tend to be of a low to moderate intensity and so rely extensively on what kind of fibres?
slow twitch muscle fibres.
In response to low to moderate intensity aerobic exercise, what happens to the size of the slow twitch muscle fibres?
increase in size - in cross-sectional area by up to 25%.
In low to moderate intensity aerobic exercise, fast twitch fibres are not generally recruited to the same extent as slow twitch fibres.
Consequently, the fast twitch muscle fibres don’t tend to increase in size. However, slight changes occur in what?
the fast twitch muscle fibre subtypes.
the fast twitch fibres type IIb may change into the more aerobic type IIa fibres in response to aerobic exercise.
The size and type of changes that occur in muscle fibres when training, depends on what?
intensity and duration of each training session and the length of the training programme.
Resistance training and sprint training rely more on what kind of fibres?
fast twitch fibres - although slow are still recruited
What happens to the size of fibres during resistance and sprint training?
both fast twitch type a and fast twitch type b fibres increase in cross-sectional area. The slow twitch fibres also increase in size but to a lesser degree.
Additionally with sprint training, there appears to be a reduction in the percentage of ____________ and an increase in the percentage of ____________, with the greatest increase occurring in the ____________ fibres.
slow twitch fibres
fast twitch fibres
fast twitch type a
With resistance training as there is a reduction in the number of _________ and an increase in the number of _____________
fast twitch type IIb fibres
fast twitch type IIa fibres.
The shift of slow twitch fibres to fast twitch fibres only appears to happen when _______ training is performed, not resistance training alone.
sprint training
