Which characteristic is a major feature of Type 2a muscle fibers?

Type 2a muscle fibers are classified as fast-twitch fibers that possess characteristics of both strength and endurance. They are particularly well-suited for short-duration, high-intensity activities, such as sprinting and weightlifting. Unlike Type 1 fibers that primarily support endurance activities and are more fatigue-resistant, Type 2a fibers can generate quick, powerful bursts of energy but can also sustain activity longer than the more purely anaerobic Type 2b fibers.

The ability of Type 2a fibers to engage in both anaerobic and aerobic metabolism makes them versatile for various physical activities, especially those that require a balance of speed and endurance over moderate durations. This is why a major feature of Type 2a fibers is their proficiency in supporting short-duration, high-intensity performances.