MOTOR CONTROL OF LANDING MOTION ON KINETIC ANALYSES ABOUT ABSORBABILITY

The impulsive force-external loads relationships are reported experimentally on eight adult males by the method providing different actions : soft and hard motion or attached spring on the platform, four jumping down heights of the stand : 15, 33, 67 and 125cm and four additional loads to the body weight : 1, 2, 4 and 8kg. The forces are dealed with as the momentum on the landing motion and apparatus used are multi-component forces plate and 16mm camera. The impulsive force is measured using the planimeter about recorded waves of multicomponent forces exerted in the landing motion over the time of 0.8sec. The results obtained are as follows ; 1) The impulssive forces are increased on the relation of the logalithmic function proportionally with the height of stand and with the weight of load. 2) According to analyses of the landing motion, these angles of the ankle, the knee and the hip are flexed greater in proportion to heigher of the stand but no changes of these angles of body segments are showed with weighter of additional loads. 3) Taking these results and reference into consideration, absorbable landing motion has been assumed to involve decrement oscillation in internal body segments and to maintain potential using for the next motion.