Davis J A, Caiozzo V J, Lamarra N, Ellis J F, Vandagriff R, Prietto C A, McMaster W C
Int J Sports Med. 1983 May;4(2):89-93. doi: 10.1055/s-2008-1026018.
The anaerobic threshold (theta an) is defined as the VO2 at which blood lactate concentration [lactate] begins to systematically increase (lactate "break point") during incremental exercise. Numerous studies have shown that gas exchange break points at the anaerobic threshold correlate highly (r congruent to 0.90) with the lactate break point. Recently, it has been suggested that the anaerobic threshold occurs at a fixed [lactate] of 2 mM or 4 mM. We therefore compared the gas exchange theta an to the three lactate criteria (break point, 2 mM, and 4 mM) for theta an estimation. Fourteen subjects performed an incremental cycle ergometer test. Ventilation and gas exchange were computed every 30 s. During the same 30-s intervals, venous blood was sampled for [lactate]. Four criteria were used for theta an determination: (1) systematic increase in VE/VO2, without a concomitant increase in VE/VCO2; (2) lactate break point; (3) 2 mM [lactate]; and (4) 4 mM [lactate]. Relative to the gas exchange criterion (i.e., #1), theta an was higher by 44, 280, and 1028 ml X min-1 for the three lactate criteria, respectively; the last two being significantly different (P less than 0.05). Thus, the anaerobic threshold discerned from gas exchange or the lactate break point does not correspond with a fixed, absolute [lactate] of 2 mM or 4 mM.
无氧阈（θan）的定义是在递增运动过程中血乳酸浓度[乳酸]开始系统性升高（乳酸“转折点”）时的摄氧量（VO2）。众多研究表明，无氧阈时的气体交换转折点与乳酸转折点高度相关（r约为0.90）。最近，有人提出无氧阈出现在固定的乳酸浓度2 mM或4 mM时。因此，我们比较了用于估计无氧阈的气体交换θan与三个乳酸标准（转折点、2 mM和4 mM）。14名受试者进行了递增式蹬车试验。每30秒计算一次通气量和气体交换情况。在相同的30秒间隔内，采集静脉血检测[乳酸]。使用四个标准来确定无氧阈：（1）VE/VO2系统性增加，同时VE/VCO2无相应增加；（2）乳酸转折点；（3）2 mM[乳酸]；（4）4 mM[乳酸]。相对于气体交换标准（即#1），三个乳酸标准对应的无氧阈分别高出44、280和1028 ml·min-1；后两者差异显著（P<0.05）。因此，从气体交换或乳酸转折点识别出的无氧阈与固定的绝对乳酸浓度2 mM或4 mM并不对应。
