一种经计算过份量和频次的氧债速度训练能使你的肌肉和血液代谢和缓解乳酸。

A measured dose of faster, anaerobic training will teach your muscles and blood to metabolize and buffer lactic acid.

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投入太多氧债区的运动会产生太多乳酸，降低在此期间的训练量，并导致疲劳持续和训练过量的风险。

Venturing too far into the anaerobic zone will generate too much lactic acid, reduce the amount of work you can do within your training session, and risk lasting fatigue and overreaching.

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耐力跑是有氧运动，马拉松倾向保持跑在开始累积乳酸的运动程度之下，亦即所谓的氧债门槛(AT)。

Endurance RACES are aerobic RACES. Marathons tend to be run at just below the level where you start to accumulate lactic acid, which is known as the anaerobic threshold (at).

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