Estudo da relação entre variáveis fisiológicas, biomecânicas e o rendimento de corredores portugueses de 3000 metros

Abstract

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<0,01). The relation- ships 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 perform- ance from physiological profile and this one, from the biomechanical behaviour