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Contributos da biomecânica para o estudo do rendimento desportivo em natação

The effect of depth on drag during the gliding phase in swimming

The gliding phase following a swimming start or turn is an important component of the overall swimming performance. PURPOSE: To analyse the effect of depth on hydrodynamic drag force during the underwater gliding, using computational fluid dynamics. METHODS: A three-dimensional domain was created to simulate the fluid flow around a swimmer model, representing the geometry of part of a lane in a swimming pool. T...

The influence of stroke mechanics into energy cost of elite swimmers

The purpose of this study was to analyze the relationships between energy cost (C), swimming velocity (v), stroke frequency (SF) and stroke length (SL) in toplevel swimmers. Eighteen elite swimmers (four freestylers, five backstrokers, five breaststrokers and four butterflyers) performed an intermittent set of n 9 200 m swims (n B 8) with increasing velocity. The oxygen consumption was measured breath-by-breath...

Predicting the intra-cyclic variation of the velocity of the centre of mass fro...

The purpose of this study was to analyze the relationship between the intra-cycle variation of the horizontal velocity of displacement of the center of mass (dV), the hand’s and feet’s velocity, as well as, to identify the variables that most predict the dV’s, in butterfly stroke. The study was divided in two parts. The aim of Part I was to investigate the behavior of variables in study at slow swimming velocit...

Novas aplicações de tecnologia computacional e biomecânica ao desenvolvimento d...

A Biomecânica constitui um dos domínios das Ciências do Desporto onde o desenvolvimento tecnológico se tem revelado mais exuberante, nomeada e especialmente a par dos desenvolvimentos operados na computação e nas novas tecnologias em geral. A natação, por seu lado, constitui a referência maior de entre as modalidades desportivas praticadas na água e, de entre estas, aquela onde, aparentemente, a investigação ci...

Chronic exposure to ethanol exacerbates MDMA-induced hyperthermia and exposes l...

A mecânica da braçada enquanto factor predictivo do custo energético em nadador...

Estudaram-se as relações entre o custo energético (Ċ), a frequência gestual (FG) e a distância de ciclo (DC), em nadadores de elite portugueses. Foram estudados 4 nadadores a Crol, 5 a Costas, 4 a Mariposa e 5 a Bruços. Os nadadores foram submetidos a um protocolo incremental de n*200 m (n ≤ 8). Os aumentos da FG induziram aumentos significativos do Ċ em todas as técnicas de nado. Aumentos da DC promoveram aume...

Swimming bioenergetics: integrating biomechanical and physiological data into a...

The purpose of the present paper is to synthesise a number of scientific contributions of our research group, into a coherent corpus of knowledge related to swimming biophysics, specially centred on the availability and use of energy in swimming. After an introductory part that intends to underline the relevance of this approach base on the conceptualization of the swimmer, and swimming action itself, as a ther...

Performance diagnosis in swimming

Energy expenditure as a function of swimming velocity is one of the major topics of interest in swimming science. Understanding the mechanisms behind swimming performance and training need new scientific approaches, while most of the existing knowledge on the bioenergetics of the four swimming strokes has already a number of years. The purpose of this presentation is to synthesize the most recent contributions ...

Economia de nado e tempo limite à velocidade mínima de vo2max: novas descobertas

A economia de nado é uma área de investigação que teve como pioneiros, em Portugal, Vilas- Boas (1993) e Alves (1995). Passada uma década, novos momentos experimentais foram realizados e resultados up to date foram obtidos. As mais recentes metodologias foram empregues e, inclusivamente, uma nova área de treino parece ter emergido - o tempo até à exaustão à intensidade de nado correspondente à Potencia Aeróbia,...