1+2/2010 - Společnost pro pojivové tkáně

points. The acceleration of gravity center is calculated from accelerations of the end ofbody elements.The human body element, the end forces and the moments are illustrated on fig. 2. Thedistance of the gravity center from the left side is denoted as a i and from the right side isdenoted as b i .The equilibrium condition of external and inertia forces is. (2)The moment equilibrium conditions are written for femur and tibia plane of the leg andfor humerus and radius plane of the arm. The unit vector is perpendicular to this planeand it is result of vector multiplication of vectors in direction of femur and tibie and/orhumerus and radius. The is a unit vector at the axis direction of the body element.The is a unit vector perpendicular to the femur – tibia plane and/or humerus – ra diusplane. (3)The rotate acceleration vector has the following coordinates (4)Figure 2: Part of the human body with end forces and moments.62LOCOMOTOR SYSTEM vol. 17, 2010, No. 1+2