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Estudo de diversos conceitos de eficiência da locomoção humana no meio aquático

01/2005;

ABSTRACT RESUMO Uma das áreas de interesse na linha fronteira entre a Biomecânica e a Fisiologia é o estudo da eficiência. Considera- se que a eficiência expressa uma relação objectiva e quantitati- va entre o trabalho mecânico realizado e o gasto energético que se lhe encontra associado. O estudo da eficiência em activida- des realizadas no meio aquático torna-se ainda mais complexo devido à dificuldade de quantificar objectivamente as trocas energéticas entre o nadador e o meio envolvente. No entanto, a Natação Pura Desportiva é uma das modalidades mais profí- cuas no estudo das suas implicações bioenergéticas e das reper- cussões em termos de eficiência dos diferentes processos de locomoção. Assim, foi objectivo do presente trabalho efectuar uma revisão do actual "estado da arte" sobre o estudo da loco- moção humana no meio aquático, com especial referência às técnicas de nado. ABSTRACT Study of several efficiency concepts about human locomotion in aquatic environment One of the major interests in the frontier between Biomechanics and Physiology is the study of efficiency. The efficiency expresses the rela- tionship between the mechanical work and the related energy expendi- ture. The study of efficiency, in the water, becomes more complex due to difficulties in quantifying, with accuracy, the energetic exchanges between the swimmer and the environment. However, swimming is one of the most studied sports, in order to understand its bioenergetical implications and the efficiency's repercussions of different locomotion processes. "State of the art" about human locomotion in water, with special reference to swimming techniques is thus presented.

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    ABSTRACT: Study the relationships between physiological profile, biomechan- ical behaviour and performance of middle-distance Portuguese runners The aim of this investigation was to study the relationships between physiological profile, biomechanical behaviour and performance of mid- dle-distance Portuguese runners. Eighteen runners were submitted to an incremental protocol of 5 trials of 3 minutes in treadmill without incli- nation. At each step, velocity was constant and between steps velocity increased by 1,45 km.h-1. Through the protocol, oxygen up-take and other bioenergetical parameters were evaluated breath-by-breath with direct oximetry. It was measured the metabolic power (Pmet), the ener- gy cost (C), the running velocity (v), the stride frequency (FG) and the stride distance (DC). It was also recorded the performance in official competition (3.000-m event). It was verified a significant and positive relationship between Pmet and v (R2=0,78; P
    Revista Portuguesa de Ciências do Desporto. 12/2007; 7(3).

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