Summary
The purpose of this study was to examine whether the ventilatory threshold (Th v) would give the maximal lactate steady state ([1a]ss, max), which was defined as the highest work rate (W) attained by a subject without a progressive increase in blood lactate concentration [1a]b at constant intensity exercise. Firstly, 8 healthy men repeated ramp-work tests (20 W·min−1) on an electrically braked cycle ergometer on different days. During the tests, alveolar gas exchange was measured breath-by-breath, and theW atTh v (W Th v) was determined. The results of two-way ANOVA showed that the coefficient of variation of a singleW Th v determination was 2.6%. Secondly, 13 men performed 30-min exercise atW Th v (Th v trial) and at 4.9% aboveW Th v (Th v + trial), which corresponded to the 95% confidence interval of the single determination. The [1a]b was measured at 15 and 30 min from the onset of exercise. The [1a]b at 15 min (3.15 mmol·1−1, SEM 0.14) and at 30 min (2.95 mmol·1−1, SEM 0.18) were not significantly different inTh v trial. However, the [1a]b ofTh v+ trial significantly increased (P<0.05) from 15 min (3.62 mmol·1−1, SEM 0.36) to 30 min (3.91 mmol·1−1, SEM 0.40). These results indicate thatTh v gives the [1a]ss,max, at which one can perform sustained exercise without continuous [1a]b accumulation.
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Yamamoto, Y., Miyashita, M., Hughson, R.L. et al. The ventilatory threshold gives maximal lactate steady state. Europ. J. Appl. Physiol. 63, 55–59 (1991). https://doi.org/10.1007/BF00760802
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DOI: https://doi.org/10.1007/BF00760802