Researchers also tested the athletes' oxygen use during hard exercise to measure aerobic endurance.

研究人员还测试了运动员在剧烈运动时的耗氧量，以测量有氧耐力。

One study showed a slight benefit in aerobic endurance but only with a dosage of 15 grams daily, 4 to 5 times as much as traditional ranges.

一项研究显示，每天服用15克，是传统剂量的4 - 5倍，可以轻微地提高有氧耐力。