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CHARACTERIZATION OF THE DYNAMIC ANSWERS OF RUNNING SHOES IN DIFFERENT STATES OF USE Author: ROBERTO BIANCO Adviser: PROF. DR. JÚLIO CERCA SERRÃO The objective of this study is: (a) to verify the effect of footwear usage on the Ground Reaction Force (GRF) and on the Plantar Pressure Distribution and (b) to verify the influence of usage in footwear of different destinations of use. Three subjects had participated of this study, each one received four running shoes, two of them are designated for training regimen (T1 and T2) and two of them for competition (C1 and C2). The footwears were used for 300km. The data collections were made in four different moments, with new footwear and after 100, 200 and 300km of use, using the Gaitway system and the F-Scan system. When footwear was new, the Loading Rate1 (LR1) was significantly higher in footwear C2, than in the footwears C1 and T2. Analyzing plantar pressure distribution, small differences were observed in the Total Contact Area (TCA) and in the peak of pressure, between the footwears. In the analysis of the different usage stages, the LR1 presented similar values between the conditions New and 300km, therefore the mechanical shock did not enhanced. In the active phase of the GRF, small oscillations were observed and attributed to the possible natural variations of the movement itself, as described before by SERRÃO (1999) and WINTER (1991). In pressure distribution, the TCA showed a significant increase from the New condition, for the other conditions of use. The increase of contact area was attributed to the possible compactation of the footwear’s material, if so this would justify the belief that the new footwear needs to be softened.

Caracterização das respostas dinâmicas da corrida com calçados esportivos em diferentes estados de uso