Unfortunately there is not very much to read about this topic, although over the last couple of years there has been some research regarding the biological basis of muscle increase.

Remember the chapter “muscle fibres – the construction”? I wrote about the genetic pre-determination there.

What science knows is, muscle fibres can change their type. It’s not only a genetic pre-determined thing.

I will try to explain it:

Increased activity ->

Transformation of type 2 to type 1 fibres

Reduced activity ->

Transformation of type 1 to type 2 fibres

Of course – this happens step by step.