We investigated whether a conditioning activity (8×12.5 m with 2.5 min-interval using both hand paddles and parachute) induced post-activation potentiation in swimming propulsive force and whether a swimmer's force level affected a post-activation potentiation response. 8 competitive swimmers (5 males and 3 females, age: 18.4±1.3 years; IPS=796±56) performed a 10 s maximum tethered swimming test 8 and 4 min before (the highest value was considered as PRE), and 2.5 and 6.5 min after (POST1 and POST2, respectively) the conditioning activity. Rate of force development was not affected, but peak force in POST1 (p=0.02) and impulse in both POST1 (p=0.007) and POST2 (p=0.004) were reduced. Possibly the conditioning activity induced greater fatigue than post-activation potentiation benefits. For instance, the number of repetitions might have been excessive, and rest intervals between the conditioning activity and POST1 and POST2 were possibly too short. There were positive correlations between PRE peak force and changes in peak force and rate of force development. Although conditioning activity was detrimental, positive correlations suggest that weaker swimmers experience a deterioration of performance more than the stronger ones. This conditioning activity is not recommended for swimmers with the current competitive level before a competitive event.
Hand paddles and parachutes have been used in order to overload swimmers, and consequently increase the propulsive force generation in swimming. However, their use may affect not only kinematical parameters (average speed, stroke length and stroke rate), but also time gaps between propulsive phases, assessed through the index of coordination (IdC). The objective of this study was to assess the effects of hand paddles and parachute use, isolated or combined, on kinematical parameters and coordination. Eleven swimmers (backstroke 50-m time: 29.16 ± 1.43 s) performed four 15-m trials in a randomised order at maximal intensity: (1) without implements (FREE), (2) with hand paddles (HPD), (3) with parachute (PCH) and (4) with hand paddles plus parachute (HPD+PCH). All trials were video-recorded (60 Hz) in order to assess average speed, stroke rate, stroke length, five stroke phases and index of coordination. When average swimming speed was compared to FREE, it was lower in PCH and HPD+PCH, and higher in HPD. Stroke rate decreased in all overloaded trials compared to FREE. The use of hand paddles and parachute increased and decreased stroke length, respectively. In addition, propulsive phase duration was increased when hand paddles were used, and time gaps shifted towards zero (no time gap), especially when hand paddles were combined with parachute. It is conceivable that the combined use of hand paddles and parachute, once allowing overloading both propulsive and resistive forces, provides a specific stimulus to improve muscle strength and propulsive continuity.
A produção de conhecimentos passa por uma série de processos que vão desde uma simples ideia, até a aplicação daquilo que foi produzido. A divulgação de um conhecimento gerado passa por um emaranhado de ações que nos levam a entender os caminhos em que esse conhecimento seja abarcado pela sociedade a que se destina. Com esse pensamento resolvemos colocar para a comunidade da natação, um conhecimento adquirido através de uma vivência prática de anos, aliado a uma constante busca através da ciência, para assim transformar, mesmo que em pequena dose, as ações no campo da natação. Esta produção é fruto da aplicação de propostas de trabalho com a natação, gerada através de mais de 30 anos de experiência vivida em um projeto de extensão da Faculdade de Educação Física da Universidade Estadual de Campinas – FEF-UNICAMP, e, da vontade de transformar essas experiências em uma proposta de programa de trabalho, que possa ser aplicado em diferentes segmentos da natação. Para tal aliamos um trabalho de dissertação de mestrado, produzido pelo programa de Pós Graduação da FEF-UNICAMP, produzido pela Professora Juliana Cumpian, sob a Orientação do Professor Dr. Orival Andries Júnior, onde se pode reunir e organizar uma proposta: Programa FEF de Natação.
A busca por indicadores das respostas imediatas obtidas durante as sessões de treinamento tem sido alvo de investigações no âmbito científico atual, neste sentido o objetivo do estudo foi verificar correlação entre indicadores da carga de treinamento de um triatleta no período pré-competitivo. Para análise dos dados utilizou-se medidas descritivas de centralidade e dispersão e o coeficiente (r) de correlação de Pearson (p<0,05). Os resultados apontam tendência de aumento do volume, da carga e das percepções de cansaço ao longo dos dias de treinamento. Em relação as semanas, verifica-se uma tendência de aumento para a carga, de diminuição da monotonia e manutenção do strain. Pode-se concluir que as variáveis analisadas parecem permitir o monitoramento das alterações no treinamento possibilitando sua caracterização.
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