The purpose of this study was to verify the relationship between physiological and metabolic variables measured in the laboratory and in fight situation and to compare both in Juvenile- A (15 to 17 yearsold), Junior (18 to 20 years- old) and Senior (more than 21 years- old) judo players. Tests were carried out in three different situations: treadmill test (TT); cycloergometer test for the upper limbs (CTUL); and fight situation (FS). From these tests, differences among the three groups were sought performed in: speed of the athlete at the anaerobic threshold (VLAn); heart rate correspondent to VLAn; peak oxygen uptake, peak blood lactate concentration and heart rate in CTUL; peak blood lactate concentration after every fight and rate of perceived exertion according to Borg's scale (1982). The main results were: a) significant inverse correlation between VLAn and peak blood lactate concentration after each fight; b) significant correlation between rate of perceived exertion and peak blood lactate concentration after fight 1 (r = 0. 8073; p < 0. 001); c) the Senior class (10. 2 ± 2. 7 mM) showed higher values of blood lactate concentration after CTUL when compared to the Juvenile- A class (6. 7 ± 1. 1 mM); d) judo players of the Junior class (17 ± 1) ended their third fight with rate of perceived exertion at higher level than those of the Juvenile- A class (13 ± 2); e) there were no significant differences concerning to VLAn, peak VO2 in the CTUL and blood lactate after FS, showing that physiologically these classes were very similar.
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