State Board U-ski In Elite Athletes’ The Front Edge Of The Foot 720° Kinetic Research

Purpose of research: Through the two-dimensional fixed-point video recording analysis on our country veneer U location ski outstanding man athlete foot the edge swivel 720°movement, it obtains the movement’s kinematics parameter ,which the veneer ski athlete had completed . it elaborated the technical features in the slot, mark, into the trough and the landing four stages from the perspectives of the kinematics technical movements. On the purpose of carrying on the more scientific technical training for the athlete and further improving the competition movement ,it provides the scientific basis.Result of research: Athletes starts the swivel before they overflows about 0.5s, from the beginning of the swivel to the end of landing the actual swivel angle which is 600°is smaller than the left cast off angle which is demarcated in the technical movement. the overflowing speed is between 10.5m/s and 14.3m/s.the overflowing angle fluctuated in in the range of 50.23-64.82°.Overflows instantaneous has the reasonable pedal to extend the movement. The aerial flight can achieve most is 4.22m greatly highly. average swivel speed most quickly reached 342.81°/s. Time landing maximum speed is 20.20m/s,the center of gravity speed and the board taxi direction has 1.8-10.1°included angle.Conclusion of research: (1) Air borne swivel angle and the actual swivel angle have the deviation, above the difference half period front, the athlete overflows ahead of time the swivel; (2) Overflows the stage center of gravity speed to reduce gradually, with the board taxi direction included angle fill-out, achieved the biggest time athlete soon soars; (3) Airborne swivel speed reduces gradually, overflows the gib or derrick to increase the rotation inertia to extend in the pedal - soars instantaneous can obtain the big swivel angular speed; (4) Pedal wall is the athlete proposes the fast only way on own initiative, best opportunity for athlete foot movement to corner time; (5) Landing period center of gravity speed increases gradually, the center of gravity speed direction with uses the edge direction inconsistent important attribute to enter affects athlete’s landing stability.Suggestion of research: Bottom of the slot sliding speed of technology is the basis for taxi.taxi route should be straight, it avoided wavy slide which would cause the horizontal glide skis that had reduced the speed of the trough.The tank process, to keep the focus speed and direction with the blade as a coordinated and effective action to improve the tread groove wall to enhance the speed of the purpose of flight altitude. The size of the tread wall motion is determined by the lower limb muscle strength, it is appropriate to enhance lower extremity muscle strength is conducive to enhance the athletes and will enhance the altitude landing stability. Turning point of the project less than the theoretical point of view, the proposed training should be combined in the simulation the actual degree swivel for training. Determine the angular speed of the air swivel action to complete the air quality of technology, proposed to strengthen the athletes and the balance of air swivel. Maintain the correct posture in the air, as far as possible into the tank before the completion of the air swivel action, so there is enough space in the process of adjustment into the tank body posture, confirmed the decline in the correct line, strengthen the landing stability.