Metric Miler wrote:
No, this is the worst myth perpetuated in the long distance running community.
There is NO evidence that you can change muscle fibre types significantly with training. You are born a sprinter, you die a sprinter.
....
There have been no studies to show any training methods can cause a significant changing of these muscle fibres either way. Only aging appears to cause a small percentage of fibres to become slow twitch.
Your ideas are false (as usual). The fact is that there just hasn't been much research into the issue at all. There's not much evidence for EITHER argument. All that we know so far shows that it is logically possible for changes in muscle type to occur, but nothing has really been proven for or against this.