[Ground force in relation to the activity of various leg muscles in the supporting foot phase of human gait].

By means of using biomechanical methods we investigated the relations between muscle activity and ground forces that are produced during walking. Our special attention was directed forwards the touching phase of the foot which was registered via integrated electromyogram (surface electrodes) and force plateform (Kistler). The initial spike of vertical force and its dependence of m. tibialis anterior activity was examined. In addition we observed connections between m. tibialis anterior activity and surface condition of the ground. Further, our results documented a damped movement of the touching fore foot and a steady take over of weight during pressing which was caused by increased tibialis activity. The pressure phase (first part of the vertical force component) was separated in two curves and defined by means of two angles. More data was given for interpretation the activities of m. gastrocnemius, m. peroneus longus and vertical and transversal force components. In further experiments we intend to analyse pathologic conditions.