Final answer:
The statement is True; training with 6 to 12 repetitions is effective for muscular hypertrophy, which involves the growth of muscle size due to increased myofibrils within the muscle cells. Resistance training must progressively increase in intensity for continued muscle growth.
Step-by-step explanation:
The statement that training using roughly 6 to 12 repetitions is most effective for achieving muscular hypertrophy is generally considered True. To achieve hypertrophy, an individual must engage in resistance training that involves progressively increasing the intensity of the exercise. Simply lifting the same weight over time will not significantly increase muscle size because the muscles adapt to the load and do not experience further stress that would induce growth.
Hypertrophy occurs due to an increase in the number of sarcomeres and myofibrils within the muscle fibers, leading to an increase in the diameter of the muscle cells rather than the formation of new muscle cells. This process is enhanced by resistance training, which also strengthens connective tissue and tendons, contributing to the overall muscle mass and ability to perform increasingly powerful contractions.
It is also important to note that individual responses to resistance training can vary greatly due to factors such as the proportion of fast-twitch to slow-twitch muscle fibers.