Muscle fibers themselves undergo changes that contribute to increased strength. These adaptations are closely tied to the type of resistance training you perform.

• Hypertrophy: While hypertrophy is primarily associated with muscle size, it also plays a role in strength development. Larger muscle fibers can generate more force, contributing to increased strength.
• Fiber Type Shifts: Strength training can induce a shift in muscle fiber types, with some fibers taking on characteristics of fast-twitch (Type II) fibers, which are more powerful and better suited for high-intensity activities. These fibers are capable of generating greater force than slow-twitch (Type I) fibers.
• Increased Myofibrillar Density: Myofibrillar hypertrophy involves an increase in the number of myofibrils, the contractile elements within muscle fibers. This increase in myofibrillar density enhances the muscle’s ability to generate force.

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