Abstract
In order to investigate the validity of critical velocity (CV) as a noninvasive method to estimate the lactate minimum velocity (LMV), 25 youth runners underwent the following tests: 1) 3,000m running; 2) 1,600m running; 3) LMV test. The intensity of lactate minimum was defined as the velocity corresponding to the lowest blood lactate concentration during the LMV test. The CV was determined using the linear model, defined by the inclination of the regression line between distance and duration in the running tests of 1,600 and 3,000m. There was no significant difference (p=0.3055) between LMV and CV. In addition, both protocols presented a good agreement based on the small difference between means and the narrow levels of agreement, as well as a standard error of estimation classified as ideal. In conclusion, CV, as identified in this study, may be an alternative for noninvasive identification of LMV.
Highlights
Blood lactate responses ([lac]) during exertion tests have been the focus of several studies, being the maximal lactate steady state (MLSS) considered the gold standard of aerobic capacity, since it represents the highest intensity of exercise in which [lac] remains in equilibrium during an exercise with constant workload (Beneke, 2003)
The lactate minimum test (LM) proposed by Tegtbur, Busse and Braumann (1993), which is characterized by the equilibrium point between the production and removal of blood lactate during an incremental test after performing a high intensity exercise, appears as an alternative when it regards MLSS, since several studies show that the lactate minimum velocity (LMV) agrees with the intensity of MLSS, with the convenience of being performed in a single test session (Pardono et al, 2009; Puga, Kokubun, Simões, Nakamura, & Campbell, 2012; Sotero et al, 2007; Sotero et al, 2009)
The results from the present study show no significant difference (p= .305) between the LMV and critical velocity (CV)
Summary
Blood lactate responses ([lac]) during exertion tests have been the focus of several studies (review of Faude, Kindermann, & Meyer, 2009), being the maximal lactate steady state (MLSS) considered the gold standard of aerobic capacity, since it represents the highest intensity of exercise in which [lac] remains in equilibrium during an exercise with constant workload (Beneke, 2003). This, in turn, reduce the accessibility to such protocol (Franken, Zacca, & Castro, 2011), derailing its application in large samples (Hiyane, Simões, & Campbell, 2006) In this scenario, the lactate minimum test (LM) proposed by Tegtbur, Busse and Braumann (1993), which is characterized by the equilibrium point between the production and removal of blood lactate during an incremental test after performing a high intensity exercise, appears as an alternative when it regards MLSS, since several studies show that the lactate minimum velocity (LMV) agrees with the intensity of MLSS, with the convenience of being performed in a single test session (Pardono et al, 2009; Puga, Kokubun, Simões, Nakamura, & Campbell, 2012; Sotero et al, 2007; Sotero et al, 2009)
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