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Modificações no perfil bioenergético e biomecânico de nadadores entre dois períodos “pré-taper”
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Advisor(s)
Abstract(s)
O presente estudo procurou analisar as alterações ao nível do perfil bioenergético e biomecânico de
nadadores de elite entre dois períodos “pré-taper”. Foram analisados 7 nadadores portugueses masculinos
de elevado nível competitivo. Os parâmetros bioenergéticos e biomecânicos foram obtidos em dois
momentos “pré-taper” (T1 e T2) antecedentes a competições importantes (Novembro e Março da época
desportiva de 2009-2010). Foram analisadas as seguintes variáveis: (i) velocidade do equilíbrio máximo
de lactato estimada às 4 mmol (V4), como indicador bioenergético; (ii) distância de ciclo à V4 (DC@V4),
frequência gestual à V4 (FG@V4), índice de nado à V4 (IN@V4) e eficiência propulsiva à V4 (ηp@V4),
como indicadores biomecânicos. A comparação entre os dois momentos de avaliação foi efectuada com
recurso à estatística não paramétrica Teste de Wilcoxon. Verificámos aumentos com significado
estatístico na V4 e na FG@V4 de T1 para T2. A DC@V4, o IN@V4 e a ηp@V4 apresentaram-se estáveis,
sem variações significativas. Do ponto de vista da análise individual, 4 dos 7 nadadores aumentaram o
seu IN@V4. Em síntese, existe uma tendência para o aumento da V4 ao longo da época desportiva. As
alterações na V4 em nadadores de elite parecem ser decorrentes de modificações nos parâmetros
biomecânicos, mais precisamente no aumento da FG@V4.
The aim of this study was to analyze the changes in the elite swimmers’ bioenergetic and biomechanical profile between two “Pre-Taper” periods. Seven Portuguese male swimmers from high competitive level were used as subjects. The bioenergetic and the biomechanical parameters were assessed in two different time moments (T1 and T2) after an intense training phase and before important competitions (December and March of the 2009-2010 season). Were analyzed: (i) the velocity of the maximal lactate equilibrium estimated to the 4 mmol (V4) as bioenergetic indicator; (ii) the stroke cycle at V4 (DC@V4), the stroke rate at V4 (FG@V4), the stroke index at V4 (IN@V4) and the propelling efficiency at V4 (ηp@V4) as biomechanical parameters. The statistical analysis between the two moments was performed using the nonparametric statistical Wilcoxon test. Significant increases in V4 and FG@V4 were observed between T1 and T2. The DC@V4, IN@V4 and the ηp@V4 remain stable without significant variations. Regarding an intra-individual analysis, four swimmers increased their IN@V4 between the two evaluation moments. In conclusion, there was a tendency for increasing the V4 during the competitive season. Changes in elite swimmers’ V4 seems to be due to biomechanical variations, most precisely in the FG@V4.
The aim of this study was to analyze the changes in the elite swimmers’ bioenergetic and biomechanical profile between two “Pre-Taper” periods. Seven Portuguese male swimmers from high competitive level were used as subjects. The bioenergetic and the biomechanical parameters were assessed in two different time moments (T1 and T2) after an intense training phase and before important competitions (December and March of the 2009-2010 season). Were analyzed: (i) the velocity of the maximal lactate equilibrium estimated to the 4 mmol (V4) as bioenergetic indicator; (ii) the stroke cycle at V4 (DC@V4), the stroke rate at V4 (FG@V4), the stroke index at V4 (IN@V4) and the propelling efficiency at V4 (ηp@V4) as biomechanical parameters. The statistical analysis between the two moments was performed using the nonparametric statistical Wilcoxon test. Significant increases in V4 and FG@V4 were observed between T1 and T2. The DC@V4, IN@V4 and the ηp@V4 remain stable without significant variations. Regarding an intra-individual analysis, four swimmers increased their IN@V4 between the two evaluation moments. In conclusion, there was a tendency for increasing the V4 during the competitive season. Changes in elite swimmers’ V4 seems to be due to biomechanical variations, most precisely in the FG@V4.
Description
Keywords
longitudinal nadadores de elite frequência gestual estabilidade elite swimmers stroke rate stability
Pedagogical Context
Citation
Costa, M.; Bragada, J.; Mejias, E.; Marinho, D.; Louro, H.; Silva, A. & Barbosa, T.(2010). Modificações no perfil bioenergético e biomecânico de nadadores entre dois períodos “pré-taper”. Acqua – revista portuguesa de natação,3, 27-35.
Publisher
Federação Portuguesa de Natação