Final answer:
The increased percentage of type II fibers, or Fast Glycolytic fibers, is associated with resistance exercises and muscle hypertrophy.
Step-by-step explanation:
The increased percentage of type II fibers, also known as Fast Glycolytic (FG) fibers, is associated with resistance exercises and the development of muscle hypertrophy. FG fibers primarily use anaerobic glycolysis to generate ATP quickly and produce powerful contractions. Trained athletes and bodybuilders have a higher ratio of FG fibers in their muscles, resulting in increased muscle mass and strength.
However, they fatigue quickly and are therefore used for short durations. The ratio of FG fibers increases in response to resistance exercise, which leads to muscle hypertrophy as more myofibrils are formed, increasing the thickness of the muscle fibers. This process is often seen in bodybuilders and athletes who engage in activities that require explosive power. There is generally no specific increased percentage provided, as the increase in FG fibers varies among individuals and is influenced by the nature and intensity of resistance training they undertake.