PMID: 3759786Sep 1, 1986Paper

Lactate and ventilatory thresholds: disparity in time course of adaptations to training

Journal of Applied Physiology
G A Gaesser, D C Poole

Abstract

We tested the hypothesis that the lactate threshold (Tlac) during incremental exercise could be increased significantly during the first 3 wk of endurance training without any concomitant change in the ventilatory threshold (Tvent). Tvent is defined as O2 uptake (VO2) at which ventilatory equivalent for O2 [expired ventilation per VO2 (VE/VO2)] increased without a simultaneous increase in the ventilatory equivalent for CO2 (VE/VCO2). Weekly measurements of ventilatory gas exchange and blood lactate responses during incremental and steady-rate exercise were performed on six subjects (4 male; 2 female) who exercised 6 days/wk, 30 min/session at 70-80% of pretraining VO2max for 3 wk. Pretraining Tlac and Tvent were not significantly different. After 3 wk of training, significant increases (P less than 0.05) occurred for mean (+/- SE) VO2max (392 +/- 103 ml/min) and Tlac (482 +/- 135 ml/min). Tvent did not change during the 3 wk of training, despite significant (P less than 0.05) reductions in VE responses to both incremental and steady-rate exercise. Thus ventilatory adaptations to exercise during the first 3 wk of exercise training were not accompanied by a detectable alteration in the ventilatory "threshold" during a 1-min incre...Continue Reading

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