Fast twitch fibres are more likely than slow-twitch fibres to grow with intense strength training. BodybuilderĪlthough growth can occur in all muscle fibre types, different types of muscle fibres vary in their potential for growth. Some people in the fitness industry will argue that bodybuilders demonstrate sarcoplasmic hypertrophy, and that their muscles look “puffy” while weightlifters demonstrate myofibrillar hypertrophy, and their muscles are “denser”.
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