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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.
Although the core and upper body muscles are involved in sprinting, itâs the collection of lower body muscles that drive against the ground by explosively extending your hip, knee and ankle joints that propel your body forward.ip extension, or when you forcefully drive your leg backward, is performed by contraction of the gluteus maximus and hamstrings. Your gluteus maximus is the largest and strongest muscle in your body. It originates at your pelvic bone and then fans down and out, where it then inserts at the top of your femur bone.