What does aerobic endurance refer to in sports performance?

Aerobic endurance specifically pertains to the efficiency and effectiveness of the cardiorespiratory system in delivering oxygen to the muscles during sustained physical activity. This ability allows athletes to perform at moderate intensities for extended periods without fatigue, crucial for sports that require prolonged effort, such as distance running, cycling, or swimming.

An efficient cardiorespiratory system indicates that the heart, lungs, and blood vessels work optimally to transport oxygen to the working muscles while removing carbon dioxide and other waste products. This facilitates longer periods of activity without exhaustion, directly impacting overall athletic performance.

The other options relate to different aspects of physical fitness and performance. Sustaining high-intensity exercise pertains more to anaerobic capacity, strength levels of muscles involve muscular strength and power, while flexibility of joints concerns the range of motion and is not directly related to aerobic endurance.