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

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.

metabolic and related thresholds

intensities of exercise (expressed as power output or as percentages of aerobic capacity, O2 max) at which specific metabolic and related changes are considered to take place. A plethora of thresholds has been proposed historically. These included many giving the same label to different criteria, or different labels to the same criterion; a number also embodied assumptions about bodily processes, at best unproven and sometimes now known to be false. The table lists six which appear unambiguous, the first five exactly as first described and the sixth slightly modified; however the two that are not related to observable phenomena (anaerobic and aerobic thresholds) are not recommended for further use. The [Lac]b (blood lactate concentration) values cited are representative approximations for a healthy but untrained young adult; they are used in some laboratories as working indices, but should not be taken as definitions of the term concerned. Other usages in the literature include: (1) OBLA as equivalent to LT or AT - confusions possible only if the reference to continuous rise is omitted from the OBLA definition; (2) the 4 mmol.L- criterion being designated as any one of 'anaerobic', 'aerobic' or 'aerobic/anaerobic' thresholds. See table overleaf .
References in periodicals archive ?
Despite the likelihood that exercise-induced bradykinin release would be associated with blood glucose reduction in T2D, to the best of our knowledge no studies have investigated the acute effects of exercise performed above and below lactate threshold on bradykinin, blood glucose, and insulin responses in this population.
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).
1997) Prediction of normal values for lactate threshold estimated by gas exchange in men and women.
max]: The lactate threshold was further determined according to the [D.
Lactate threshold and onset of blood lactate accumulation during incremental exercise after dietary modifications.
Key Words: Blood Lactate, Lactate Threshold, Metabolic Acidosis, Ventilatory Threshold
Assessing lactate threshold during exercise has been a well-investigated method of exhausting athletic performance by determining blood lactate levels; training status of a given athlete can be used to multipulate a training prescription.
The checkup included blood tests, ECG and ECO, lactate threshold and metabolic tests (VO2max - anaerobic threshold; carbohydrate - fat - heart rate zones), in addition to assessing any old or new injuries that could impact the players in the new season.
Briefly, the predominant source for ATP while exercising below the lactate threshold is fat but the degree to which fat is used varies between individuals.
PACE also offers lactate threshold tests and sports planning.
This is known as the first lactate threshold (LT1) or the first increase in blood lactate concentration above resting values.