Resumo

BRAGADA, José A.  e  BARBOSA, Tiago M.. Study the relationships between physiological profile, biomechanical behaviour and performance of middle-distance Portuguese runners . Rev. Port. Cien. Desp. [online]. 2007, vol.7, n.3, pp.291-298. ISSN 1645-0523.

The aim of this investigation was to study the relationships between physiological profile, biomechanical behaviour and performance of middle-distance Portuguese runners. Eighteen runners were submitted to an incremental protocol of 5 trials of 3 minutes in treadmill without inclination. 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 energy 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<0,01). The relationships between C and FG or DC were no-significant. The relationships between v and FG (R²=0,34; p<0,01), as well as, between v and DC (R2=0,87; p<0,01) were statistically significant and positive. It was observed a significant relationship between performance and Pmet at 16 km.h^-1 (R²=0,23; p=0,05). In conclusion, for portuguese middle-distance runners, it seems to exist a moderate dependence of performance from physiological profile and this one, from the biomechanical behaviour.

Palavras-chave : running; performance; energy cost; gait length; gait frequency; velocity.

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