An endurance athlete might consider using caffeine supplementation to improve performance because caffeine A - HSC - SSCE Personal Development and Physical Education - Question 13 - 2020 - Paper 1

Caffeine is well-researched in the context of endurance sports and is known to have beneficial effects on performance. One of the main reasons an endurance athlete might consider using caffeine is that it reduces the perception of fatigue. This can help athletes push through discomfort and maintain higher levels of performance for longer durations.

Additionally, caffeine may promote glycogen sparing, which means that it helps to utilize fat as an energy source during prolonged exercise rather than relying solely on glycogen stores. This can be particularly advantageous for endurance athletes, as it allows them to conserve their glycogen reserves, delaying fatigue and improving overall endurance.

In summary, option D encapsulates the most accurate and relevant benefits of caffeine supplementation for endurance sports.