Davis H A, Gass G C
Br J Sports Med. 1979 Dec;13(4):165-9. doi: 10.1136/bjsm.13.4.165.
Five male subjects performed three successive incremental work tests on an electronically braked cycle ergometer. The first and second tests were separated by thirty minutes of rest, the second and third by three minutes of maximum work. During the third test, venous blood lactate concentrations were still decreasing at work rates where they were increasing during the first two tests. The work rate at which rapid increases in lactate concentrations occurred during the final test coincided with the work rate where rapid increases occurred in the two initial tests. It was concluded that this point represented a threshold where a balance existed between removal and release of lactate from and into the plasma compartment, and did not coincide with the anaerobic threshold. It is postulated that steady state work at levels above this threshold would result in a continuous increase in venous lactate concentration.
五名男性受试者在电子刹车的自行车测力计上进行了三次连续的递增负荷测试。第一次和第二次测试之间休息30分钟，第二次和第三次测试之间进行三分钟的最大负荷运动。在第三次测试中，静脉血乳酸浓度在工作强度下仍在下降，而在前两次测试中该强度下乳酸浓度却在上升。最后一次测试中乳酸浓度快速上升时的工作强度与前两次测试中乳酸浓度快速上升时的工作强度一致。得出的结论是，这一点代表了一个阈值，此时血浆中乳酸的清除和释放达到平衡，且与无氧阈值不一致。据推测，在高于该阈值的水平进行稳态运动将导致静脉血乳酸浓度持续升高。
