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If that promotes the development of fast-twitch muscle fibres in growing foetuses, that could add to the Jamaican edge. The truth is, we donât have enough information to draw firm conclusions about the Jamaican dominance of sprinting. But there is good reason to dig deeper â and it has nothing to do with athletics. We now have evidence that extreme stress, heat, cold, malnutrition and pollution (including tobacco smoke) trigger changes in the way genes are activated or silenced.
The marathoner have trained for muscle endurance. The sprinter have trained for muscle strength. that's is what you can see when look at their appearance. Strength muscle(big muscle) will show how strong you are but it's get tired very fast. When you training for this you must limit repetition from 8-12reps.