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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.
Well, it depends on what type of run you are doing. Each type of run (see below) works your muscles differently and and may target one group more than the other. Also, the type of muscles you have can make a big difference in which distance you excel at. Typically, people with a higher percentage of fast twitch muscle fibers do better at sprints and other things (weight training, etc) that require short bursts of energy.