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Validity of the critical velocity for determination of the training effects on the anaerobic threshold in endurance runners. The objective of this study was to analyze the validity of the critical velocity (CV) to evaluate the anaerobic threshold (AnT), before and after two different training programs in endurance athletes. Seventeen male runners (33.4 ± 4.4 years; 62.7 ± 4.3 kg; 166.1 ± 5.0 cm) divided in two groups (G95% - N = 9 and G100% - N = 8) performed the following tests: 1) Maximum shots of 1500 and 5000 m for determination of the CV; 2) Determination of the VO2max, the speed corresponding to VO2max (vVO2max), running economy (EC), AnT and time to exhaustion (Tlim) at the intensity of 95 and 100% vVO2max. Tests were performed before and after 4 weeks of training, which was similar to both groups, except for the two days of interval training. Before training, there were no differences between AnT (17.31 ± 1.3; 17.35 ± 0.8 km/h) and CV (16.97 ± 1.1; 17.44 ± 0,9 km/h) for G95% and G100%, respectively. After training, there was an improvement in AnT (G95% = 17.98 ± 1.1; G100% = 18.11 ± 0.6 km/h) for the two groups, and in CV for G95% (G95% = 17.25 ± 1.0; G100% = 17.63 ± 0.7 km/h). In this period, the AnT was higher than the CV for the two groups. We can conclude that the validity of the CV to evaluate the AnT determined with fixed blood lactate concentration (4 mM), may be dependent on the period and/or type of training performed by endurance athletes.

Validade da velocidade crítica para a determinação dos efeitos do treinamento no limiar anaeróbio em corredores de endurance