The Soccer Coach. Marco Bruno
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fiber.
White type II fibers, clear, thick and rapid called FT (fart twitch = fast-twitch fibers).These fibers come into action in intense muscular stress and rapid force. Their capillarization is 2.9 capillaries, on average, per fiber.
There are three sub-categories of FT fibers, namely:
1 Type IIa fibers (oxidative-glycolytic capacity);
2 Type IIb fibers (high glycolytic capacity);
3 Type IIc fibers (high oxidative capacity and good glycolytic capacity, also called intermediate fibers).
According to some research, champion athletes enjoy a genetic privilege. The research has discovered a DNA gene called "alpha-actinin-3" that controls the production of actinin in muscle, a key constituent of fast-twitch fibers. The alpha-actin-3 gene exists in two main alternative forms, called “alleles”, given as a gift by each of the parents, which can be the same or different, can be presented with a double pair
of RR alleles, determine the presence of the sprint protein in the muscle;
of XX alleles, do not command the production of actinin;
of RX alleles, partial actinin production, majority of the population
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