| Using the method of simi motion three-dimensional video system analysis,taking the first-class cross-country skiers in Hebei Province as the experimental object,this paper analyzes the video of athletes' Sport simultaneous propulsion technology in the process of skiing,and obtains the kinematic parameters of cross-country skiing simultaneous propulsion technology in the process of skiing.The purpose of this paper is to analyze the correlation between the speed of the first-class cross-country skiers in Hebei Province and their kinematic parameters,such as joint angle,angular velocity and angular acceleration,so as to provide a scientific biomechanical basis for the training of cross-country skiers in the same time,and also provide support for the public to carry out cross-country skiing.This paper uses SPSS 20.0 to analyze the speed,joint angle,angular velocity,angular acceleration and other kinematic parameters of cross-country skiing.The results show that:(1)The maximum speeds of athletes during the putting period are 19.64 m / s,17.9m/ s,23.34 m / s,25.57 m / s,22.93 m / s,21.53 m / s,21.72 m / s,17.7m / s.The average speeds are 12.91 m / s,14.74 m / s,15.33 m / s,16.90 m / s,13.18 m / s,16.75 m / s,16.42m/ s,12.47 m / s.The maximum speeds of athletes during the coasting period were 11.59 m /s,17.76 m / s,13.83 m / s,14.7m / s,18.64 m / s,14.7m / s,16.15 m / s,and 12.84 m / s.The average speed is 9.08 m / s,11.63 m / s,9.96 m / s,11.57 m / s,12.62 m / s,11.53 m / s,11.90 m / s,9.47 m / s.The average speed of the athletes in one exercise cycle is 10.28 m /s,12.39 m / s,11.55 m / s,13.43 m / s,12.78 m / s,13.41 m / s,12.76 m / s,10.31 m / s.(2)Stick pushing period: the maximum speed of the athlete during the pushing stick period is highly positively correlated with the knee angle at this time(r = 0.946,P <0.01),and is moderately positively correlated with knee angular velocity and hip angular acceleration(r = 0.592,P <0.01)(r = 0.514,P <0.01),which is negatively correlated with moderate ankle angular acceleration(r =-0.587,P <0.01),and has a low positive correlation with angular velocity of the hip joint(r = 0.480,P <0.01)had a low positive correlation with the angle of the ankle joint(r = 0.373,P <0.01).The average speed of athletes during the push of the stick was moderately positively correlated with the angular velocity of the elbow joint and the angular acceleration of the ankle joint(r = 0.596,P<0.01)(r = 0.539,P <0.01),and it was low with the knee and ankle angles The degree is positively correlated(r = 0.424,P <0.01)(r = 0.474,P <0.01),and has a low degree of positive correlation with the hip angular velocity(r = 0.300,P <0.01),and is related to the knee angular velocity and elbow joint angular acceleration There was a low degree of negative correlation(r =-0.442,P <0.01)(r =-0.492,P <0.01).(3)Taxiing period: The maximum speed of the athlete during the taxiing period is highly negatively correlated with the hip angle at this time(r =-0.873,P <0.01),and highly positively correlated with the ankle angle(r = 0.810,P <0.01).The average speed of athletes during the glide period was moderately positively correlated with hip joint angular velocity and angular acceleration(r = 0.504,P <0.01)(r = 0.775,P <0.01),and negatively correlated with the elbow angle(r =-0.342,P <0.01),which was moderately negatively correlated with ankle angular acceleration(r =-0.745,P <0.01).(4)Exercise cycle: The average speed of an athlete's exercise cycle has a low positive correlation with the elbow joint angular velocity during the push(r = 0.466,P<0.01);it has a moderate positive correlation with the elbow acceleration during the glide period(r = 0.533,P <0.01),and there was a low degree of positive correlation with hip angular acceleration,hip angular velocity,and knee angle(r = 0.494,P <0.01)(r = 0.462,P <0.01)(r = 0.382,P <0.01),Highly negatively correlated with ankle angular acceleration(r =-0.887,P <0.01),and lowly negatively correlated with elbow angle(r =-0.420,P <0.01);and elbow angular velocity in one exercise cycle The angular acceleration of the elbow joint was moderately positively correlated(r = 0.579,P <0.01)(r = 0.597,P <0.01),and was lowly positively correlated with hip angle and hip angular velocity(r = 0.321,P <0.01)(R = 0.404,P <0.01),which is moderately negatively correlated with the ankle angular acceleration(r =-0.655,P <0.01),and is lowly negatively correlated with the elbow angle(r =-0.402,P <0.01).Conclusion:(1)Athletes should maintain relatively large knee and ankle joint angles,large elbow joint angular velocities,and small knee joint angular velocities in order to obtain maximum speed during the gliding period.(2)During the glide period,the athlete shall maintain a relatively small hip joint angle,a large hip joint angular velocity,and a large elbow joint angle to obtain maximumspeed.(3)To improve the athlete's cross-country skiing special quality and the speed of advancing technology at the same time,it is necessary to train the athlete's technical movements to improve the athlete's elbow,hip,knee and ankle joints.Strength.At the same time,we should also pay attention to the flexibility and mobility training of joints and other places. |
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