ABSTRACTThe objectives of this study are to investigate the effects of biological maturation on the energy cost (EC),maximal aerobic power (VO2MÁX), maximum accumulated oxygen deficit " reduced" (MAODRED) and performances by swimmers.To participle in this study of 50 swimmers in the state and national level in the youth categories petiz, infantile, juvenile, junior and senior. Will be evaluated in four days with a minimum interval of 24 hours between one test to another.The swimmers will perform a single maximum effort of 400 meters to determine the EC, VO2MÁX, MAODRED, using the technique the backward extrapolation curve of oxygen consumption. After maximal effort, the values of metabolic oxygen consumption will be determined by a portable metabolic unit ( MedGraphics VO2000) during the first 20 seconds of recovery at the end of MAODRED and maximum effort will be determined as the sum of energy contribution of anaerobic metabolism ( alactic and lactic), at the5 minutes of recovery after maximal exercise, the EC will be determined by the difference between the measurement of VO2MÁX and VO2 at rest, be determined the energy cost of aerobic metabolism (CeAER), the energy contribution of anaerobic metabolism is from the alactic fast component of the excessive consumption of oxygen after exercise (EPOCRAP). The EPOCRAP be estimated using the biexponential model using the program Origin Pro 8.0 ( Origin LAB Corporation, Microcal, Massachusetts, USA) . The contribution of lactic (CeLAT) will be estimated by the difference between peak lactate concentration ([Lac]pico) measured after exercise and measured in rest. So the total energy cost will be determined from the sum of :CeAER, CeALA,CeLAT , and the following equation: CEtotal = CeAER +CeALA + CeLAT.To determine the performance, the swimmers will perform a maximum effort of 100 and 200m crawl, which will be determined: speed of 200m ( V ) that will be assumed as the performance of 200m (P200); speed of 100m (V ) performance of 100m (P100), number of strokes (NS), stroke rate (SR), time (t), stroke length(SL) and stroke index (SI). For biological age divison will be determined using self-assessment of secondary sexual characteristics according to the criteria established by Tanner (1962).Values MAODRED, EC, VO2MAX, P400, P200, P100, SL, SR and SI between the categories ( petiz, infantile, juvenile, junior, senior) will be compared with the analysis of variance test ( one- way) and when necessary, Post hoc Newmam- Kleus. The Pearson correlation test will be used to verify the possible association of physiological parameters, mechanical and performance in all categories. In all cases the level of significance will be pre-set at p< 0.05.Key words: swimming, biological maturation, maximum accumulated oxygen deficit, maximal oxigygen consumption, performance.
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