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Lactate in human skeletal muscle after 10 and 30 seconds of supramaximal exercise


, : Lactate in human skeletal muscle after 10 and 30 seconds of supramaximal exercise. Journal of Applied Physiology Respiratory Environmental & Exercise Physiology 55(2): 365-367

To evaluate the extent of anaerobic glycogenolysis, as indicated by intramuscular lactate concentration, after 10 and 30 s of supramaximal exercise and to compare men and women subjects in this regard, 15 males and 7 females performed 2 cycle exercise bouts against a resistance which was standardized so that 1 pedal revolution resulted in 4.90 J work .cntdot. kg body wt-1. A muscle biopsy was obtained after 10- and 30-s exercise bouts and analyzed for lactate concentration. The lactate concentrations averaged 36 and 61 mmol .cntdot. kg dry wt-1 after the 10- and 30-s exercise bouts, respectively. The male subjects had higher (P < 0.005) lactate concentrations and generated higher (P < 0.001) power outputs for both exercise bouts. When the mean lactate concentrations were statistically adjusted after controlling for between-group variation in power output, no difference was evident between groups for the 10- or the 30-s lactate value. Prounounced lactate accumulation occurs during supramaximal exercise of a 10-s duration, suggesting that glycolysis can occur within this time frame. This is in contrast to the theory that glycolysis does not occur until endogeneous phosphagen levels reach some critically low value, not thought to be obtainable within the first 10 s of supramaximal exercise.

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