Análise da assimetria da braçada do nado crawl através do nado atado
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Data
2016-08-23
Autores
Correia, Regiane Diniz [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Atualmente, a natação é praticada em diversos níveis, desde o terapêutico até o competitivo. Fatores biomecânicos que interferem no desenvolvimento da força propulsiva influenciam mais no desempenho do que na capacidade de produzir energia. Visando o alto rendimento, o objetivo deste trabalho foi detectar a assimetria da braçada do nado crawl através do nado atado e verificar a sua possível relação com a queda de desempenho. Com a utilização da dinamometria foi possível descrever as variáveis dinâmicas da força da braçada através de célula de carga, e com o auxílio da cinemetria comparar as variáveis da assimetria entre os braços e a frequência média de ciclos de braçadas. O método do nado atado foi empregado para avaliar 8 nadadores competitivos, com o mínimo de 2 anos de treinamento, de ambos os sexos, com idade entre 11 e 20 anos. Os dados de força obtidos foram coletados durante o nado crawl em um protocolo de 30 segundos, sendo 10 segundos iniciais de nado moderado, e 20 segundos de nado em intensidade máxima. As médias dos picos de força, frequência e ciclos foram descritas e comparadas entre as braçadas direita e esquerda. Os resultados da comparação entre a braçada direita e esquerda não diferiram estatisticamente: FM NA (80,28N ± 16,48); e FM NA (87,48 ±29,77) respectivamente. Quando comparados individualmente apenas, dois dos oito sujeitos apresentaram diferença entre as braçadas (p<0,05). Os resultados sugerem que os nadadores que apresentam assimetria significativa podem estar relacionado com o estilo do nado, técnica e treinamento específico. O índice de assimetria encontrado nos outros nadadores não é considerado fator crítico. Assim, o nado atado continua sendo uma das melhores formas de mensuração da força, e pode ser utilizado como prognóstico de treinamento, em provas de curta distância.
Currently, swimming is practiced at various levels, from the therapeutic to the competitive. Biomechanical factors that affect the development of the propulsive force, influence on performance more than the ability to produce energy. Aiming high performance , the aim of this study was to detect the asymmetry of the front crawl stroke by tethered swimming and check their possible relationship with the performance drop. With the use of grip strength was possible to describe the dynamic variables of the stroke force by load cell, and with the help of kinematics compare the variables of the asymmetry between the arms and the mean frequency of strokes cycles. The tethered swimming method was used to evaluate 8 competitive swimmers, with a minimum of two years of training, of both sexes, aged 11 and 20 years. The strength data were collected during the crawl in a 30-second protocol, 10 seconds of moderate swimming, and 20 seconds of swimming at maximum intensity. The average of the force peaks, frequency and cycles were described and compared between the right and left strokes. The results of the comparison between the right and left stroke were not statistically different: FM NA (80,28N ± 16.48); and FM NA (87.48 ± 29.77) respectively. When compared individually only two of the eight subjects showed difference between the lengths (p <0.05). The results suggest that the swimmers have significant asymmetry may be related to the style of swimming, technical and specific training. The asymmetry index found in other swimmers is not considered critical. Thus, the tethered swimming remains one of the best ways to measure the strength, and can be used as a prognostic training in evidence walking distance.
Currently, swimming is practiced at various levels, from the therapeutic to the competitive. Biomechanical factors that affect the development of the propulsive force, influence on performance more than the ability to produce energy. Aiming high performance , the aim of this study was to detect the asymmetry of the front crawl stroke by tethered swimming and check their possible relationship with the performance drop. With the use of grip strength was possible to describe the dynamic variables of the stroke force by load cell, and with the help of kinematics compare the variables of the asymmetry between the arms and the mean frequency of strokes cycles. The tethered swimming method was used to evaluate 8 competitive swimmers, with a minimum of two years of training, of both sexes, aged 11 and 20 years. The strength data were collected during the crawl in a 30-second protocol, 10 seconds of moderate swimming, and 20 seconds of swimming at maximum intensity. The average of the force peaks, frequency and cycles were described and compared between the right and left strokes. The results of the comparison between the right and left stroke were not statistically different: FM NA (80,28N ± 16.48); and FM NA (87.48 ± 29.77) respectively. When compared individually only two of the eight subjects showed difference between the lengths (p <0.05). The results suggest that the swimmers have significant asymmetry may be related to the style of swimming, technical and specific training. The asymmetry index found in other swimmers is not considered critical. Thus, the tethered swimming remains one of the best ways to measure the strength, and can be used as a prognostic training in evidence walking distance.
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Palavras-chave
Natação, Nado Atado, Força, Desempenho, Swimming, Tethered Swimming, Force, Perfomance