Análise cinemática da largada do bobsled / Kinematic analysis of bobsled start

AUTOR(ES)

Alexandre Dias Lopes

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

05/10/2006

RESUMO

Bobsled is a sport developed for practiced in winter time and has as main objective cover an inclined ice track of approximately 1500 m in less time as possible. The activity is initiated with the sleigh stopped, without movement. There are two modalities, the bobsled for four persons and for two persons. The initial movement of the bobsled is known as the propulsion moment and its importance for a good final performance had already been demonstrated in preview studies. This moment is executed in the modality for two persons by the pilot athlete and by the breakman athlete. The purpose of this study was to investigate the existence of a kinematic pattern adopted by the pilot athlete and the breakman athlete during the propulsion moment of the sleigh of the 15 best teams of the championship, as well as the existence of a relation between the propulsion moment and the final time of the test and the variation of the performance gotten by all the participant teams. The imagesm used in this study had been acquired during the XIV Word-Wide Championship of male bobsled in the modality for two persons, carried through in the city of Koonigsee (Germany) in 2004. To investigate the kinematic pattern it was used variables related to the shoulder, elbow, trunk and knee angles; variations of the center of gravity displacement and height; and the length of the step of the pilot and breakman athletes. It was possible to identify a typical kinematic pattern adopted by the pilot and breakman athletes during the propulsion moment, beyond identifying similarities between the behavior adopted by the pilot and breakman athletes during the propulsion moment and the behavior adopted by the track and fields athletes. The correlation coefficient found in this study was similar to those found in the previous studies (around r2=0,5) as well as the small variation verified in the performance between the participant teams (less than 4%)

ASSUNTO(S)

biomecânica biomechanics cinemática esporte kinematic sports

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