The design of appropriate physical training involves several factors, including the need to evaluate the intensity of training. In order to identify the best training plan intervals for short and long distances in juvenile swimmers we compare the twospeed (2V) and T30 tests. We compare competitive 16 years old swimmers (n=35.22 men) that were evaluated anthropometrically and following biochemical and hematological parameters. The swimmers underwent both tests to determine the appropriate speed

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... egime for endurance training. After speed test determination, different protocols were studied: 80x25m to 2x1000m, all over a 2.000m course. For each test and protocol, maximum heart rate and heart recovery frequency; effort perception; mechanical efficiency and lactacidemy were measured. Our results show a signifi cant difference in speed between tests 2V (1.36±0.12).and T30 (1.21 ± 0.12), We found a difference in the lactacidemy in most of the courses, except for the 200m course. In addition to the intensity demonstration, the importance of a complementary evaluation (heart frequency, mechanical effi ciency and effort perception) was demonstrated. We did not found sex difference in the studied parameters. This study showed signifi cant differences for the evaluation tests and protocols used to training design. Our data led to conclude that the use of 2V test with 40x50m and 20 x 100m series protocols are the best to evaluate the training velocity.