Influenced of the angle thigh-trunk on the mobility of the postural chain

The increase of the mobility of the basin improves the performance when the area of ischio-femoral contact is reduced at the time of the tasks executed in seated position. This research has for objective to study the function that the angle plays articularthigh-trunk (C-T) on the performance. It is about an experimental survey that has been achieved on 8 masculine topics. We used a platform by force oblong of (120 x 60) cm and an equipment made of wood placed next to the platform that allowed us to value the characteristic cinematics of the performance (speed and accelerations of the gravity center) according to the antero-posterior axes and vertical, as well as the instant of the detachment of the buttocks. The gotten results showed that some meaningful differences have been observed in the condition 45 °, to the level of the vertical acceleration of the gravity center as well as his/her/its speed, the antero-posterior acceleration of the gravity center as well as its speed, the maximum receding of the center of the pressures except for the antero-posterior speed at the time of the detachment of the buttocks. But no difference has been noted in the condition safe 0° for the length of the detachment of the buttocks. The modification of the is chio-femoral contact area associated to a modification of the articular angle between the trunk and the thighs have an influence therefore on the performance.