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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.
The stretch reflex prevents people from overextending their muscles. Protective response is what prevents muscles from being stretched too far. Before a workout, take time to gently and slowly stretch the muscles in order to help prevent any muscle damage.Runners who don't stretch adequately before a workout run the risk of muscle tears or other damage.Tapping the petellar tendon with a reflex hammer will trigger the knee jerk reflex.efore a workout, take time to gently and slowly stretch the muscles in order to help prevent any muscle damage. Runners who don't stretch adequately before a workout run the risk of muscle tears or other damage. Tapping the petellar tendon with a reflex hammer will trigger the knee jerk reflex.