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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.
How to Develop Muscle. Muscle building results when the body repairs tears that occur during strenuous exercise. Photo Credit Minerva Studio/iStock/Getty Images. Muscle building cannot occur without first tearing down muscle fibers, the main component of muscle tissue.Hypertrophy is the term used to describe an increase in muscle bulk, which occurs when the body repairs torn muscle fibers.Weight lifting, resistance training and long-distance running are among the stressors that initiate the teardown and muscle-building cycle.osmetic bodybuilding involves developing muscle in specific areas of the body. Powerlifting requires well-developed muscular size and strength. If your goal is participation in sports, you need to develop varying levels of muscular endurance as well as strength, depending on the sport of your choice.