lactate threshold

(redirected from Onset of Blood Lactate Accumulation)
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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.
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References in periodicals archive ?
HIIT: high-intensity interval training group; CON: control group; V[O.sub.2]max: maximal oxygen uptake; PTS: peak treadmill speed; OBLA: running speed corresponding to onset of blood lactate accumulation; RE: running economy.
Prolonged stage duration during incremental cycle exercise: effects on the lactate threshold and onset of blood lactate accumulation. Eur J Appl Physiol 2001; 85:351-357.
Determination of anaerobic threshold (AnT) and Onset of blood lactate accumulation (OBLA) intensities: Anaerobic threshold ([AnT.sub.BI]) was determined by visual inspection of abrupt increase of the lactate concentration response using bi-segmented linear regression model (determined by three specialists in physiology of exercise) and the onset of blood lactate accumulation was corresponded to 3.5 mmol.[L.sup.-1] fixed blood lactate concentration (OBLA3.5) (Figure 3).
The critical power model has been validated and correlated with the aerobic endurance determined by ventilatory threshold (Moritani et al., 1981), fatigue threshold (DeVries et al., 1982), individual anaerobic threshold (McLellan and Cheung, 1992), onset of blood lactate accumulation (OBLA) (Papoti et al., 2005; Wakayoshi et al., 1993) and maximal oxygen uptake (Jenkins and Quigley, 1992), showing it to be a good tool for assessing the aerobic parameter.
In another study by DalMonte and Leonardi (1976), it was reported that the onset of blood lactate accumulation of international kayakers occurred in a time frame between 79 and 87% of [VO.sub.2]peak.