USE OF GROUND REACTION FORCE PARAMETERS IN PREDICTING PEAK TIBIAL ACCELERATIONS IN RUNNING

Ground reaction force data and tibial accelerations from a skin-mounte d transducer were collected during rearfoot running at 3.3 m/s across a force platform. Five repetitive trials from 27 subjects in each of 1 9 different footwear conditions were evaluated. Ground reaction force as well as tibial acceleration parameters were found to be useful for the evaluation of the cushioning properties of different athletic foot wear. The good prediction of tibial accelerations by the maximum verti cal force rate toward the initial force peak (r2 = .95) suggests that the use of a force platform is sufficient for the estimation of shock- absorbing properties of sport shoes. If an even higher prediction accu racy is required a regression equation with two variables (maximum for ce rate, median power frequency) may be used (r2 = .97). To evaluate t he influence of footwear on the shock traveling through the body, a go od prediction of peak tibial accelerations can be achieved from force platform measurements.