Wasserman K
Clin Chest Med. 1984 Mar;5(1):77-88.
The exercise intensity (VO2) above which aerobic energy production starts to be supplemented by anaerobic mechanisms is termed the anaerobic threshold (AT). Lactic acid is produced at an increased rate above this work level. Since this acid is almost completely buffered by HCO-3, the rate of CO2 production increases in excess of that being derived from oxidative metabolism. Thus measurement of this excess CO2, or some reflection of it, can be used during exercise to measure the AT noninvasively. The AT has great physiologic significance, as it demarcates the work rate that the subject can perform for a prolonged period and above which a metabolic acid occurs.
有氧能量产生开始由无氧机制补充时的运动强度（VO2）被称为无氧阈（AT）。高于此工作水平时，乳酸生成速率会增加。由于这种酸几乎完全由HCO-3缓冲，二氧化碳生成速率的增加超过了氧化代谢产生的速率。因此，在运动过程中，可以通过测量这种过量的二氧化碳或其某种反映来无创地测量无氧阈。无氧阈具有重要的生理意义，因为它划分了受试者能够长时间维持的工作速率，高于此速率会发生代谢性酸中毒。
