Final answer:
Resistance training can increase muscle strength and size, with noticeable improvements typically observed within a few weeks. This is achieved through hypertrophy, the enlargement of muscles, which is associated with an increase in different types of muscle fibers.
Step-by-step explanation:
Resistance training, also known as strength training, can increase muscle strength and size. With several weeks of heavy resistance training, an individual can likely increase muscle strength. This increase in muscle strength is associated with increases in different types of muscle fibers, specifically MHC I, IIa, and IIx.
During resistance training, the muscle fibers undergo hypertrophy, which is the enlargement of muscles. This is achieved by the formation of myofibrils, resulting in an increase in the thickness of the muscle fibers. As a result of this muscular enlargement, individuals may experience an increase in muscle strength.
It's important to note that the exact time frame for muscle strength improvements can vary depending on factors such as genetics, training intensity, and individual response to exercise. However, with consistent and proper resistance training, noticeable improvements in muscle strength can typically be observed within a few weeks.