Author(s): Oliveira, Roberto Cláudio Azevedo Pinto de
Date: 2011
Persistent ID: http://hdl.handle.net/10400.6/3187
Origin: uBibliorum
Subject(s): Natação - Crol; Natação - Crol - Performance - Avaliação; Natação - Crol - Performance - Aspectos hidrodinâmicos; Natação - Crol - Jovens - Rendimento desportivo
O propósito deste estudo contempla três objectivos. O primeiro passa por compreender a relação entre a performance do nado completo em crol e da pernada na mesma técnica. O segundo é analisar a relação entre a performance do nado de crol com algumas variáveis hidrodinâmicas associadas à pernada. Finalmente, o terceiro pretende apreender quais os efeitos de um programa de treino de pernada de crol, na performance e nas variáveis hidrodinâmicas. Para tal, 36 nadadores (10.03±0.66 anos, 43.18±8.28 kg, 1.51±0.06 m) participaram neste estudo. A performance a 200m crol, a 200m pernas de crol e o arrasto activo foram medidos. O método da perturbação da velocidade foi seleccionado para a medição do arrasto activo. Foram ainda destacados para efectuarem um programa de 8 semanas de treino de pernada de crol. O grupo Experimental 1 (E1, n=12) realizou a totalidade dos metros previstos. O segundo grupo Experimental (E2, n=12) efectuou metade deste volume e o grupo de Controlo (C, n=12) substitui este programa por tarefas de técnica, com o esmo volume e a baixa intensidade. A performance aos 200m crol relacionou-se significativamente (p<0.01) com a prestação nos 200m pernas de crol (0.87), a força de arrasto hidrodinâmico da pernada (0.50) e com os valores de potência, também da pernada (0.58). Os valores do coeficiente de arrasto não registaram nenhuma relação com a prestação nos 200m crol. Depois de aplicadas as 8 semanas de treino de pernada, só encontramos diferenças estatisticamente significativas entre E1 e E2 na Vm da pernada. Mas, quando comparamos as diferenças intra-grupos, registamos que, em E1, as variáveis Prs200 (0.003), Tp200 (0.002), Vm p (0.005) e Vm (0.005) progrediram significativamente. Em E2, a evolução foi verificada nos Prs200 (0.026), no D (0.026) e na P (0.021). No grupo C, apenas a Tp200 (0.003) e a Vm p (0.016) evidenciaram diferenças estatisticamente significativas. Estes resultados encontrados sublinham a importância das acções da pernada de crol na performance do nado completo dos nadadores destas idades, e sugerem ainda o importante papel que as tarefas de pernada assumem nos treinos dos jovens nadadores.
The purpose of this study has three objectives. The first was to understand the relationship between the performance of the front crawl and the front crawl leg kicking. The second was to analyse the relationship between front crawl performance and hydrodynamic variables during leg kicking. Finally, the third was to learn about the effects of an 8 week leg kick training program on the performance and on the hydrodynamic variables. Thirty three agegroup swimmers (10.03±0.66 years-old, 43.18±8.28 kg, 1.51±0.06 m) participated in this study. The 200m front crawl performances, the 200m front crawl kicking performance and the active drag during leg kicking were measured. The velocity perturbation method was used to determine active drag. They were also assigned to an 8 week leg kick training program. The Experimental group 1 (E1, n=12), performed the totality of the train. The Experimental group 2 (E2, n=12) only performed half of that train, and a Control group (C, n=12), substitute this program by technique tasks of the same volume and at a low intensity. The 200m front crawl performance was significantly correlated (p<0.01) with the performance in 200m kicking (0.87), the hydrodynamic drag force during leg kicking (-0.50), and with power output during kicking (-0.58). Drag coefficient values were not related to the performance in 200 m front crawl. After applying the 8 week leg kick train, we only find a significant difference between E1 and E2 on the Vm in leg Kick. But when we compare de differences intra-group, we find in E1 that variables as Prs200 (0.003), Tp200 (0.002), Vmkp (0.005) and Vmk (0.005) progressed significantly. In E2, the evolution was registered in the Prs200 (0.026), in the Dk (0.026) and in the Pk (0.021). In the group C, only the Tp200 (0.003) and the Vmkp (0.016) shows statistical differences. These findings underline the importance of leg kicking to overall performance in front crawl swimming in these ages and can suggest the important role of the kicking tasks during training in young swimmers.
