This study is to present more effective starting skills through analysis of kinematic characteristics of starting motions in 300m Time Trials of Inline Skating. To achieve this goal, 6 athletes, 3 in the national team and 3 in business teams were chosen and their starting motions were examined with ...
This study is to present more effective starting skills through analysis of kinematic characteristics of starting motions in 300m Time Trials of Inline Skating. To achieve this goal, 6 athletes, 3 in the national team and 3 in business teams were chosen and their starting motions were examined with three-dimensional image analyses. The results of analyses in regard of positions and speed of the bodily center and angles, angular velocity, and linear velocity of articulations of lower limbs by sections of starting motions are as follows: 1) Acceleration in the starting section is determined by the speed and the position of bodily center at the moment of leaving the ground not by the aerial movements. In case of the central position, though it is effective to reduce the air resistance by lowering the upper part of the body maximumly, it is reasonable to accelerate by raising the upper part of the body to some degree for the running posture at the lower speed in the starting section. At the lower speed in the starting section, since the push-off motions are made with the front part of skates at a point, not while gliding, the angle in the articulations of lower limbs is bigger. This shows that the faster changes from the running posture to the gliding skills is made, the more effective motions can be made. 2) Since good records can't be expected in the condition of big stretching out or bending, hip joints should be appropriately raised to achieve good results. It seems to be the characteristics of inline skating. When skates leave the ground, femurs get to turn forward on the axis of lower limbs. This motion makes knee-joints bent and knees and ankles raised. It makes rotatory motion of hip joints easier by reducing the moment of inertia in the lower limbs. Thus, taking the motions raising knees and ankles is a factor accelerating in the starting section. 3) At the moment of starting, acceleration by reducing the angles of knees to increase safety on the ground is reasonable, but wheels should touch more with the ground to minimize the impact and friction of skates. In the starting section, it is efficient to minimize the period of time in touching the ground. For this, it is necessary to train for taking motions without slippage while touching the ground. 4) While 3 athletes in business teams kicked the ground as running right after the starting, the others in the national team slid on the ground. As the number of steps increased, the movable speed changed quickly. Thus the movable speed of athletes in the national team indicated big differences in two to three steps. If these factors are well supported, the push-away starting method might be better than the running starting method in terms of improvement of records.
This study is to present more effective starting skills through analysis of kinematic characteristics of starting motions in 300m Time Trials of Inline Skating. To achieve this goal, 6 athletes, 3 in the national team and 3 in business teams were chosen and their starting motions were examined with three-dimensional image analyses. The results of analyses in regard of positions and speed of the bodily center and angles, angular velocity, and linear velocity of articulations of lower limbs by sections of starting motions are as follows: 1) Acceleration in the starting section is determined by the speed and the position of bodily center at the moment of leaving the ground not by the aerial movements. In case of the central position, though it is effective to reduce the air resistance by lowering the upper part of the body maximumly, it is reasonable to accelerate by raising the upper part of the body to some degree for the running posture at the lower speed in the starting section. At the lower speed in the starting section, since the push-off motions are made with the front part of skates at a point, not while gliding, the angle in the articulations of lower limbs is bigger. This shows that the faster changes from the running posture to the gliding skills is made, the more effective motions can be made. 2) Since good records can't be expected in the condition of big stretching out or bending, hip joints should be appropriately raised to achieve good results. It seems to be the characteristics of inline skating. When skates leave the ground, femurs get to turn forward on the axis of lower limbs. This motion makes knee-joints bent and knees and ankles raised. It makes rotatory motion of hip joints easier by reducing the moment of inertia in the lower limbs. Thus, taking the motions raising knees and ankles is a factor accelerating in the starting section. 3) At the moment of starting, acceleration by reducing the angles of knees to increase safety on the ground is reasonable, but wheels should touch more with the ground to minimize the impact and friction of skates. In the starting section, it is efficient to minimize the period of time in touching the ground. For this, it is necessary to train for taking motions without slippage while touching the ground. 4) While 3 athletes in business teams kicked the ground as running right after the starting, the others in the national team slid on the ground. As the number of steps increased, the movable speed changed quickly. Thus the movable speed of athletes in the national team indicated big differences in two to three steps. If these factors are well supported, the push-away starting method might be better than the running starting method in terms of improvement of records.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.