Is the lacks have fast-twitch muscles notion true? ?
The theory you’re talking about is partly true. There is a theory that… genetically speaking people of African decent are likely to be born with more fast twitch fibers in their muscle tissue than those born of Caucasian decent. What is important to recognize is that it’s about GENETICS NOT RACE! It may be more common to find a specific trait to be more common in a particular race …but if one wished to, with correct selection or parents, someone could (dare I say) ‘breed’ a child who is genetically made for running. The number of fast or slow twitch fibers that a person has in their muscles is predetermined by genetics …however that’s not to say that a person has a fixed maximum speed. With training a person can increase the size (NOT THE NUMBER) of fast twitch fibers. Increasing the size of a fast twitch muscle fiber should in theory allow for more more available energy to those fibers …if you look up ‘biological energy systems’ on a search engine you should be able to learn m
