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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.
In addition the thigh flexor muscles are also the primary muscle group responsible for sprinting speed-so by conditioning your thigh flexor for speed you will see dramatic improvements in your sprinting speed as well as your kicking abilities-even if you are already a top performer.he speed comes by conditioning the fast twitch muscle fibers in your leg muscles to perform what is called a 'fast twitch response' â which basically means to contract with speed and acceleration. The bottom line is you cannot condition your muscles for speed using the same techniques you use to train for strength.