Encontrados 9 documentos, a visualizar página 1 de 1

Characterization of speed fluctuation and drag force in young swimmers: a gende...

The aim of this study was to compare the speed fluctuation and the drag force in young swimmers between genders. Twenty-three young pubertal swimmers (12 boys and 11 girls) volunteered as subjects. Speed fluctuation was measured using a kinematical mechanical method (i.e., speedo-meter) during a maximal 25-m front crawl bout. Active drag, active drag coefficient and power needed to overcome drag were measured w...

The interaction between intra-cyclic variation of the velocity and mean swimmin...

The aim of this study was to assess the relationship between the intra-cyclic variation of the horizontal velocity (dv) and the velocity of the 4 competitive swimming techniques in young swimmers. 45 young swimmers performed a set of maximal 4 × 25 m (freestyle, backstroke, breaststroke and butterfl y stroke) swims with in water start. A speed-meter cable was attached to the swimmer’s hip. The dv and the swimmi...

Contributos da biomecânica para o estudo do rendimento desportivo em natação

Comparação do coeficiente de arrasto calculado com recurso a três formas distin...

O acto de nadar é caracterizado pela aplicação intermitente de uma força propulsiva para ultrapassar o arrasto hidrodinâmico. Entre outros, o arrasto é condicionado pela área de superfície frontal, pela forma e pela velocidade a que um objecto se desloca no meio aquático (Marinho et al., 2010).

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...

Validation of a cable speedometer for butterfly evaluation

Getting fast results from the evaluation of swimmers is one of the most important goals to achieve with technological development in the field. The purpose of this study was to validate a real-time velocimetric device (speedometer) through the comparison of their results with computer assisted videogrametry. The sample included 7 international level swimmers (3 females and 4 males). Each swimmer performed four ...

A kinematical, imagiological and acoustical biofeedback system for the technica...

A system for real time velocimetric feedback, and for immediate disposal of kinematica data, and model, synchronized with dual-media video images, will be presented.

Acute effects of the use of a biofeedback system for the technical training in ...

The purpose of this research was to develop, validate, and evaluate a biofeedback system for the technical training in breaststroke swimming. The system lied on the assessment of speed fluctuation curves of an anatomical landmark of the swimmer(hip).

Validation of a cable speedometer for butterfly stroke

Most of the approaches available for technical evaluation of swimmers are very expensive and time consuming. Thus, one of the most important goals to achieve in swimming research should be to get fast and interactive results from the evaluation process. The purpose of this research was to compare me real-time velocimetric results obtained from a cable velocimeter with those extracted from computerised videogram...