Abstract
1253 The anaerobic threshold (AT) is well established as a practical measurement of aerobic capacity and endurance performance. It has been proposed that the blood lactate concentration which correspond to the AT may be fixed at 3.5 or 4.0 mM in respectively 200 an 400m swimming tests. The purpose of this study was to verify equivalence of these two type of test. Eight male and six female competitive swimmers (15 ± 01 years old) were submitted at two different protocols for AT determination. In the first test (400M), the subjects performed three 400 meters freestyle swimming at 85, 90 and 100% of maximal velocity for this distance, respectively. AT was calculated to swimming velocity corresponding at 4mM of lactate. For the second test (200M) similar procedures were utilized, but swimming 200 meters and AT calculated to 3.5 mM of blood lactate. The values (means ± SD) of maximal blood lactate concentration after swimming [Lac]max in 400M (6.01 ± 1.12 mM) was significantly different (P < 0.05) than [Lac]max in 200M (6.87 ± 1.47 mM). The AT-200M (79.32 ± 4.08 meters/min) was significantly higher that AT-400M (77.01 ± 3.64 meters/min) and correlation coefficient between these variables too was high (r = 0.96, P < 0.05). These data suggest that the two tests are not equivalent and 200M is more indicated for practical utilization because lower time cost.
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