How is lactate threshold measured?
Lactate threshold is measured by relating blood lactate concentration to exercise intensity during a graded exercise test, with thresholds identified using fixed-value or curve-fitting methods. This page describes the me
How is lactate threshold measured?
Lactate threshold is measured by sampling blood lactate concentration during a graded or constant-work-rate exercise test and relating those values to the exercise intensity at which they were obtained. The formal term is lactate threshold; related terms include anaerobic threshold, lactate turn point, and maximal lactate steady state, although these are not interchangeable. The measurement class is a physiological exercise-testing procedure, not a molecular assay, and it therefore has no sequence, formula, or molecular weight. In the research literature, lactate threshold is commonly reported as a secondary outcome alongside peak oxygen consumption (VO₂peak), critical power, and anaerobic work capacity [1].
The work centres on skeletal muscle energy metabolism, specifically the balance between adenosine triphosphate (ATP) resynthesis and the accumulation of glycolytic intermediates during exercise [2].
Research Studies
Lactate threshold and graded exercise testing in healthy older adults
In a randomized, double-blind, placebo-controlled, two-arm crossover clinical trial in healthy older adults, lactate threshold was listed among the secondary outcomes, together with changes in VO₂peak, critical power, anaerobic work capacity, and NAD⁺ metabolite levels [1]. The primary outcome in that trial was cycle ergometry constant work rate (CWR) exercise tolerance, measured as time to fatigue [1]. This places lactate threshold measurement within a test battery rather than as a standalone endpoint.
Lactate threshold and skeletal muscle energy metabolism in cycling performance
A comprehensive review of the physiology and evidence base for ergogenic and medical supplements in cycling performance reported that direct enhancement with ergogenic supplements is primarily achieved via modulation of skeletal muscle energy metabolism, and that during exercise, ATP resynthesis is a central process [2]. The review was informed by a structured literature search of PubMed, Scopus, and Web of Science for peer-reviewed studies published up to May 2025, including studies with human participants published in English that evaluated endurance performance, recovery, or physiological function [2]. Lactate threshold measurement is used in this literature as one index of the metabolic response to exercise.
Lactate threshold and constant work rate exercise tolerance in healthy older adults
In the same trial in healthy older adults, the primary outcome was cycle ergometry constant work rate exercise tolerance, measured as time to fatigue, while lactate threshold was a secondary outcome [1]. The trial evaluated a patented age-reversal therapy, EGA®, compared with conventional nicotinamide mononucleotide (NMN) supplementation, and assessed safety and efficacy in improving exercise tolerance and modulating biomarkers of aging [1]. The measurement of lactate threshold in this design is therefore tied to a constant work rate protocol rather than to a graded protocol alone.
Lactate threshold and VO₂peak in healthy older adults
Within the secondary outcomes of the healthy older adult trial, lactate threshold was grouped with changes in peak oxygen consumption (VO₂peak), critical power, anaerobic work capacity, and NAD⁺ metabolite levels [1]. This grouping indicates that lactate threshold is measured alongside, not instead of, other physiological endpoints. The trial population was healthy older adults [1].
Lactate threshold and critical power in healthy older adults
Critical power and lactate threshold both appeared as secondary outcomes in the healthy older adult crossover trial [1]. The trial used a two-arm crossover design and was randomized, double-blind, and placebo-controlled [1]. No values for lactate threshold were provided in the available evidence.
Lactate threshold and anaerobic work capacity in healthy older adults
Anaerobic work capacity was listed as a secondary outcome in the same trial, together with lactate threshold [1]. The trial assessed safety and efficacy in improving exercise tolerance and modulating biomarkers of aging in healthy older adults [1]. The evidence does not specify the measurement method used for lactate threshold.
Lactate threshold and NAD⁺ metabolite levels in healthy older adults
NAD⁺ metabolite levels were included among the secondary outcomes of the healthy older adult trial, alongside lactate threshold [1]. The trial compared EGA®, composed of three metabolomic compounds, with conventional NMN supplementation [1]. The available evidence does not report lactate threshold values or the direction of any change.
Lactate threshold and supplement mechanisms in cycling performance
The cycling performance review stated that a growing body of evidence supports the use of supplements to enhance cycling performance through both direct and indirect mechanisms, and that direct enhancement is primarily achieved via modulation of skeletal muscle energy metabolism [2]. The review included human studies published in English up to May 2025 that evaluated endurance performance, recovery, or physiological function [2]. Lactate threshold is not itself a supplement or a mechanism; it is a measured physiological variable used in such studies.
Comparison of measurement contexts
| Context | Population | Lactate threshold role | Other outcomes listed |
|---|---|---|---|
| Randomized, double-blind, placebo-controlled, two-arm crossover trial [1] | Healthy older adults [1] | Secondary outcome [1] | Cycle ergometry CWR time to fatigue (primary), VO₂peak, critical power, anaerobic work capacity, NAD⁺ metabolites [1] |
| Comprehensive review of ergogenic and medical supplements for cycling performance [2] | Human participants in included studies [2] | Not specified as an outcome in the available evidence | Endurance performance, recovery, physiological function [2] |
If you are reading this for personal health reasons
The materials described here are sold for laboratory research only, and we do not provide dosing or medical guidance. Anyone considering a compound for themselves should speak to a licensed clinician. This page is a description of measurement methods and research context, not a recommendation.