The validity of the lactate minimum test for determination of the maximal lactate steady state


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Abstract

The validity of the lactate minimum test for determination of the maximal lactate steady state. Med. Sci. Sports Exerc., Vol. 30, No. 8, pp. 1304-1313, 1998.Purpose:The purpose of this study was to investigate the validity of the lactate minimum test([Lac]BMIN) in the determination of the velocity at the maximal lactate steady state (V-MLSS), and to identify those physiological factors most closely associated with 8-km running performance.Methods:Thirteen trained male runners (V˙O2max range 53-67 mL·kg−1·min−1) took part in an 8-km simulated race on flat roads and completed a comprehensive battery of laboratory tests.Results:Performance velocity was most strongly correlated with the estimated running velocity at V˙O2max(r = 0.93) and with V-MLSS (r = 0.92) and velocity at lactate threshold (V-Tlac)(r = 0.93). The running velocity at the ventilatory threshold (V-Tvent) (r= 0.81) and the [Lac]BMIN (r = 0.83) also produced good correlations with performance velocity. Performance running velocity (mean ± SEM 16.0 ± 0.3 km·h−1) was not significantly different from V-MLSS (15.7 ± 0.3 km·h−1). The running velocity at [Lac]BMIN (14.9 ± 0.2 km·h−1) was not significantly different from the V-Tlac (15.1 ± 0.3 km·h−1) or V-Tvent (14.9 ± 0.3 km·h−1) but was significantly lower than the V-MLSS (P < 0.05). The [Lac]BMIN provided the lowest correlation with V-MLSS (r = 0.61) and the worst estimate of V-MLSS (SEE = 0.75 km·h−1) compared with the other measures of lactate accumulation. The V-Tlac was not significantly different from V-MLSS and provided the highest correlation (r = 0.94) and a close estimate (SEE = 0.33 km·h−1) of the V-MLSS.Conclusions:It is concluded that of the measures studied relating to blood lactate accumulation during submaximal exercise, V-Tlac provides the best estimate of the V-MLSS. The V-MLSS and the V-Tlac had equal predictive power for 8-km race performance.

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