Effects of different handle techniques during the back pull exercise on the angular kinematic and production of strength

The present investigation aims to verify the kinematic pattern of movement in the back pull exercise through the evaluation of the articular angle of the joint of the elbow and shoulder between two different handle techniques in the bar: open and closed, considering the spans of the individuals. Furthermore, the possible interference about these different techniques on the maximal dynamic strength (MDS) and the located muscular resistance were related. The bidimensional videography with a camera operating at the frequency of 60Hz was used to capture images which were later analyzed and processed by the Peak Motus System. Twenty six (26) young individuals of both sexes took part in the kinematic analysis of the movement, 11 male individuals for the determination of the maximum dynamic strength and 10 also male for the determination of the located muscular resistance. The indicates significant angular discrepancies among the distinct handle techniques for each involved joint (elbow and shoulder). The closed handle technique has presented a largest flexion angle at the end of the movement for the elbow joint, witch implicate a higher acting of the flexor muscles on that joint. The results have also showed that the size of the span exerts influence on the articular movement as long as the bar remains with the same length for all individuals. For the maximal dynamic strength the individuals have achieved a better result on the through the closed handle technique unlike the behavior of the strength of located muscular resistance where the individuals have achieved a better result through the open handle. Ke y-Words: resisted exercises with weight, kinematic, back pull ex e r c i s e RESUMO Analise cinematica de duas tecnicas de “pegada” no exercicio puxada alta A presente investigacao objectivou investigar, no exercicio com pesos denominado “puxada alta”, os ângulos articulares do ombro e cotovelo em duas diferentes tecnicas de pegada: aberta e fechada, considerando a envergadura dos individuos e ainda verificar a interferencia desta tecnicas na forca maxima e forca muscular localizada. Para analise cinematica utilizou-se videografia bidimensional e um teste de 1RM e RMs para determinar a forca maxima e de resistencia, respectivamente. Participaram deste estudo 26 individuos de ambos os sexos para realizar a analise cinematica, 11 individuos do sexo masculino para determinacao da forca maxima e 10 para a forca de resistencia muscular localizada. Os resultados mostraram que na tecnica de pegada fechada houve maior flexao do cotovelo no final do movimento, implicando maior accao dos musculos flexores desta articulacao. O tamanho da envergadura tambem influenciou nos ângulos articulares, mostrando que os individuos de maior envergadura tendem a flexionar mais o cotovelo no fim do movimento. Em relacao a forca maxima, os individuos tiveram melhor desempenho na tecnica de pegada fechada, enquanto que na forca de resistencia muscular o melhor desempenho foi na pegada aberta. Conclui-se que as variacoes nas tecnicas de execucao podem ser um factor interveniente no treinamento resistido com pesos. Palavras-chave: biomecânica, cinematica, exercicios com pesos