lactate threshold

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The level above which pyruvate—an intermediate product of anaerobic metabolism—is produced faster than it can be used aerobically; unused pyruvate splits into lactate (lactic acid) and positively charged hydrogen ions; continued exercise above the lactate, or anaerobic, threshold results in accumulation of these ions—acidosis—causing exhaustion and intramuscular pain
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lac·tate thresh·old

(lak'tāt thresh'ōld)
The workload during exercise of increasing intensity, when a measurable increase in venous blood lactate levels occurs in conjunction with an exponential increase in respiratory frequency.
See also: ventilatory threshold, anaerobic threshold
Synonym(s): onset of blood lactate accumulation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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Sport researchers explain the science behind and application methods of high-intensity interval training (HIIT), which entails exercise consisting of repeated bouts of high-intensity work performed above the lactate threshold or critical speed/power, interspersed by periods of low-intensity exercise or complete rest.
Biochemical markers were measured before and during testing, including oxygen uptake heart rate, lactate threshold, and V[O.sub.2peak].
(14) conducted on 10 male participants who were moderately trained, subjects ran for 5 minutes at 90% of V[O.sub.2 max] and then rested in passive recovery and under active recovery conditions at various levels of lactate threshold. As a result of this study, it was found that active recovery was significantly better than passive recovery in terms of lactate recovery, whereas this effect of active recovery was only possible when runs were performed at a level close to high lactate thresholds and that runs performed at 40% of the maximal lactate threshold even yielded results similar to passive resting.
Nowadays, many trainers and scholars of sport sciences point to the importance of lactate threshold, initiation of blood lactate accumulation and, heart rate as indices of physiological pressure for the evaluation and determination of athletes' ability in endurance activities.
In contrast, correlations between [lactate] and HR were high in the WODs (WOD 1: 0.938, p < 0.000; WOD 2: 0.915, p < 0.000; WOD 3: 0.933, p < 0.000), yet were not significant (r = 0.13) during a continuous cycle ergometry exercise at the intensity of the lactate threshold (Green et al., 2005).
In my papers I looked at what would happen if one person had the best values ever recorded for the 'big three' - maximal oxygen uptake, the so-called lactate threshold, and running economy or efficiency.
The spirometric variation of the RE is also revealed to some extent in the correspondingly modified lactate threshold. With an increase of 320 [+ or -] 160 seconds (versus HIIT: 198 [+ or -] 128 seconds), MICE has a more significant (p<.001) effect on the IANS (as a presumed expression of economic metabolic processes in the submaximum load range) than HIIT.
Within the 3 groups, the bicycle ergometry revealed no significant difference in performance at the 4 mmol lactate threshold and at maximum performance (Table 2).
[D.sub.max]: The lactate threshold was further determined according to the [D.sub.max] method (L[T.sub.Dmax]) suggested by Cheng et al.
Lactate threshold and onset of blood lactate accumulation during incremental exercise after dietary modifications.
However, the initial increase in blood lactate concentration implies the net result of lactate production in the muscle, and reflects that the appearance rate of lactate in the blood is higher than the disappearance rate (the result of a balance between the rate of production and removal) [11,12] This is referred to as the lactate threshold and is considered to be a good predictor of endurance exercise performance.