Originally posted by John2226us
Icedog: It's not so much that you teach your slowtwitch fibers to act like fast twitch (though there is some speculation this can happen, it is highly controversial). It goes like this: You have a certain amount of muscle fibers in a given muscle. Then you have nerve cells (neurons)that tell these fibers when and how much they need to contract. The greater the stimulus from the neuron, the harder the contraction. So each neuron stimulates a certain number of muscle fibers each. One neuron and the muscle fibers it's connected to is called a Motor unit. The thing is, no one can activate all their motor units in a muscle at once. About 50 % are kept in reserve (sometimes when adreanaline sets in, in a state of shock or extreme danger you can activate a much higher number). What actually happens when you train heavy weights and plyometrics, is that you stress the muscle/nerve system, and thereby force it to activate more motor units. This is why you can get stronger without adding a lot of bulk. Neural training.
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