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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.
I believe I strained mine by doing some unexpected sprinting, which means I was hastily moving my leg forward and upwards and overworked the hamstring muscle beyond what it was used to. The sciatic nerve runs from your spine down through your behind, your hamstring, past your knee, into your calf, and then your foot.