Which adaptation occurs in muscles as a result of resistance training?

The adaptation that occurs in muscles as a result of resistance training involves increased muscle fiber size and strength. Resistance training, such as weightlifting, creates micro-tears in muscle fibers, prompting the body to repair these fibers. This repair process increases the size of the fibers—a phenomenon known as hypertrophy—resulting in larger and stronger muscles over time.

As individuals engage in regular resistance training, muscle fibers adapt to the increased demands placed on them. This leads to not only an increase in size but also improvements in muscular strength, allowing individuals to lift heavier weights or perform more challenging physical tasks. Additionally, the neuromuscular adaptations that occur can improve the efficiency of muscle contractions, which further contributes to overall strength gains.

In contrast, other options present varying concepts that do not align with the primary effects of resistance training. For instance, decreased flexibility and enhanced endurance are typically associated with other training modalities rather than resistance training specifically. A reduction in muscle mass over time contradicts the fundamental goal of resistance training, while improved nerve signal transmission may occur but is not the main adaptation attributed to resistance training itself.