It is hard to believe, that over a quarter century later we still discuss this topic. But first of all Merry christmas and happy holiday
There are fundamental studies out there showing very clear, that lactate is not what it used to be and ugly byproduct but rather an incredible substance with multiple task to help us to survive. Nevertheless tradition is hard to kill and as the theory fit so nicely the business plan we simply try to stick to it. It is like the 220 - age myth or the ill defined idea, that we can predict maximal HR. On this forum it is an ill define attempt to justify a great tool the MOXY with a bad historical mistake, than lactate threshold. We have with MOXY a futuristic tool and method for people on the street and to try to bring it under the people we go back to old mistakes. Hard to believe that that is needed but even harder to believe that this could work. Before I give you some interesting articles to read I like to just make one single comment.
MOXY tests as close as we can get for the moment simple and non invasive at the muscle cell base line. Lactate is testing somewhere on the surface ( ear , finger toe or where ever the "sales" person decides to get your blood.
The believe that a substance ( Lactate who is used for different purposes buffer H +, carrier shuttle of energy a.s.o , produced in a muscle cell, moved into the blood stream , reused in other muscle cell, will give us any thing to be used for training intensity is an interesting idea but !!! lactate is a great great bio marker if properly used for metabolic information but not as intensity control. There is no such thing like a deflection point from a physiological point of view. Any " threshold is constructed due to the test protocol;l rather than the physiological appearance of lactate in the blood. Let's stop here and let you read.
ANAEROBIC THRESHOLD - A RELATIVELY USELESS CONCEPT FOR COACHING
Billat, L. V. (1996). Use of blood lactate measurements for prediction of exercise performance and for control of training: Recommendations for long-distance running. Sports Medicine, 22, 157-175.
This article contains a very concise summary of the concept of anaerobic threshold and how it is depicted in the literature. The implications of each individual statement are particularly important given the pre-occupation of many coaches with this concept. The major points of the article are discussed below. Further features are introduced in the "Implications" section.
Here another simple to understand article
And here another nice paper discussing the problem.
Lactic acid: New roles in a new millennium
1. L. Bruce Gladden*
1. Department of Health and Human Performance, Auburn University, Auburn, AL 36849-5323
The study of lactic acid (HLa) and muscular contraction has a long history, beginning perhaps as early as 1807 when Berzelius found HLa in muscular fluid and thought that “the amount of free lactic acid in a muscle [was] proportional to the extent to which the muscle had previously been exercised” (cited in ref. 1). Several subsequent studies in the 19th century established the view that HLa was a byproduct of metabolism under conditions of O2 limitation. For example, in 1891, Araki (cited in ref. 2) reported elevated HLa levels in the blood and urine of a variety of animals subjected to hypoxia. In the early part of the 20th century, Fletcher and Hopkins (3) found an accumulation of HLa in anoxia as well as after prolonged stimulation to fatigue in amphibian muscle in vitro. Subsequently, based on the work of Fletcher and Hopkins (3) as well as his own studies, Hill (and colleagues; ref. 4) postulated that HLa increased during muscular exercise because of a lack of O2 for the energy requirements of the contracting muscles. These studies laid the groundwork for the anaerobic threshold concept, which was introduced and detailed by Wasserman and colleagues in the 1960s and early 1970s (5–7). The basic anaerobic threshold paradigm is that elevated HLa production and concentration during muscular contractions or exercise are the result of cellular hypoxia. Table 1 summarizes the essential components of the anaerobic threshold concept.