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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.
Whether itâs from ove-Kegel exercising or squeezing P.C. muscles in order to compensate for a soft erection, the act of flexing and squeezing the P.C. muscles cause the muscle fibers to stretch and tear. This means the fibers need to be repaired, which is where testosterone and other nutrients come in.