Which of the following best describes the role of beta-alanine in exercise?

Beta-alanine plays a crucial role in exercise by enhancing endurance and delaying fatigue, particularly during high-intensity activities. It is a non-essential amino acid that combines with histidine to form carnosine, a dipeptide that helps buffer acidity in muscle cells. This buffering action is significant during intense exercise, as it helps to maintain optimal pH levels in the muscles, thereby delaying the onset of fatigue.

When exercised intensely, muscles produce hydrogen ions, which can lower pH and contribute to muscle fatigue. Carnosine's role as a buffer helps counteract this acidic environment, allowing for sustained performance for a more extended period. Consequently, individuals who supplement with beta-alanine may experience improved endurance, enabling them to train harder and longer before fatigue sets in.

In summary, the ability of beta-alanine to improve endurance and delay fatigue is its defining characteristic in the context of exercise performance, making it a valuable supplement for athletes and fitness enthusiasts who engage in high-intensity workouts.