Abstract des Autors

Fifteen male judo athletes taking part in national (n=5) or regional (n=10) competitions, aged 19.1+/-3.3 years, body height = 170.0+/-11.2 cm, body mass = 75.2+/-12.8 kg, performed a graded exercise at the beginning (pre-season) and at the end (post-season) of a competition season lasting 18 weeks. The VCO2 excess (Ex(VCO2)), defined as the VCO2 output due to lactate buffered by bicarbonate, was determined during the exercise. No significant changes were found in VO2max (46.9+/-6.4 vs. 45.2+/-6.6 ml/min/kg). VO2 at anaerobic threshold (AT; 34.9+/-4.6 vs 33.2+/-3.8 ml/min/kg) and heart rate - maximal (184+/-8.2 vs. 185+/-4.9 beats/min) or at AT (160+/-9.4 vs. 153+/-9.6 beats/min). In contrast, significant increases were found in the maximal lactate (9.1+/-2.5 vs. 12.0+/-2.6 mmol/l, P<0.01), Ex(VCO2) (30.8+/-15.0 vs. 43.6+/-14.2 ml/kg, P<0.05) and in the maximal power output (280+/-37 vs. 300+/-35 W) in the second test. The Ex(VCO2) was related to body mass (r=0.72, P<0.01). Moreover, the between-test differences in Ex(VCO2) were directly related to the respective initial values at the start of the season and to the corresponding changes in body mass (r=0.75, P<0.001). Despite the fact that non-metabolic VCO2 seems to be ineffective to estimate lactate evolution during the competition period VCO2 excess is more sensitive than lactate to the effects of training. Moreover, the initial level of non-metabolic VCO2 at the start of the season and the expected changes in body mass were better predictors of the final anaerobic capacity than the initial lactate values. Verf.-Referat