This article, written in English by Véronique L. Billat et al., talks about the concept of the Maximal Lactate Steady State (MLSS), which the authors define as the highest blood lactate concentration (MLSSc) and work load (MLSSw) that can be maintained over time without a continual blood lactate accumulation.

The abstract of this article can be accessed in the Information section at https://www.laktate.com/information/basic-aspects/the-concept-of-maximal-lactate-steady-state-a-bridge-between-biochemistry-physiology-and-sport-science/?lang=en. On this same page you will be able to find a link to the complete article.