LENGTH OF SERIAL ELASTIC ELEMENT AND CONTRACT ELEMENT DURING VERTICAL JUMP: COMPARISON OF STATIC OPTIMIZATION AND DYNAMIC OPTIMIZATION

The purpose of this study was to: (1) compare the length of serial elastic element, contract element estimated by two different optimizations, and (2) examine that whether those methods are able to evaluate the length of serial elastic element, contract element. One healthy male performed a vertical jump with the maximal effort from a squat position. The coordinate data and the ground reaction force were obtained with a 3D motion analysis system (250Hz) and force platform (10WHz). For a dynamic optimization, we developed muscle activation driven forward dynamics simulation model. As a result, the pattern of length of element estimated by the dynamic optimization was similar to the pattern reported by Kurokawa et al. (2001). On the other hand, the pattern of length of element estimated by the static optimization differed from the pattern reported by Kurokawa et al. (2001). This finding might be useful to clear the mechanics of human movements