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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.
Glutes. The glutes, or muscles of the backside, are some of the largest muscles in your body. Sprinters use them to assist in propulsion and to support the work of the quadriceps and hamstrings. When sprinting, you may find that the glutes work less than the legs.he quadriceps are the muscles at the front of the thighs. These muscles raise the leg and propel the runner forward. Muscles throughout your body work in coordinating pairs.