| Research objective: With the development of volleyball,the competition between players across the net is becoming more and more intense.Whether it is the front or back row spike or the powerful jump serve,they all need to jump through the run-up to obtain a higher jump height for spiking.Spiking is the main means of active scoring,and the quality of spiking often determines the outcome of the game.In this study,the wearable inertial sensing device was used to capture the technical movements of the teenage volleyball players in real time to obtain the kinematic data of the subjects in the process of spiking.Then,the subjects were divided into two groups to carry out Complex training method and traditional resistance training method respectively,and explore the kinematic influence of the two training methods on the technical movements of the subjects.Research Methods: A total of 30 young male volleyball players aged 14-16 were selected in this study,and the 30 players were randomly divided into control group and experimental group.The subjects wear the sensor of Perception Neuron inertial motion capture system to complete the spike technology action of position 4.The kinematic data of the subjects’ spike technology is preprocessed by the supporting software Axis Studio and exported in Bvh file.All data are expressed as mean ±standard deviation.SPSS26.0 software is used for data collation,statistics and processing in mathematical statistics.Then Graphpad Prism software is used for data graphing.Analyze whether there are differences in the kinematic parameters of the two groups of spike technical action with different training methods.0.05 was a significant difference.Results: 1.Run-up stage: the stride length before and after the last step of the experimental group was significantly different(P < 0.05).The swing arm amplitude of the experimental group and the control group was significantly different before and after intervention(P < 0.05).The running distance of the experimental group before and after intervention was significantly different(P < 0.05).There were significant differences in knee and ankle flexion angles before and after intervention in the experimental group(P < 0.05).2.Take-off stage: The buffer time of the experimental group was significantly different before and after intervention(P < 0.01).The gravity center vertical velocity of the experimental group was significantly different before and after intervention(P< 0.01).There were significant differences in the control group before and after intervention(P < 0.05).The flexion angles of hip,knee and ankle in the experimental group were significantly different before and after the intervention(P < 0.01).In the control group,the flexion angles of hip and ankle joints were significantly different before and after intervention(P < 0.05).The angular velocity of hip joint and ankle joint was significantly different in the experimental group before and after intervention(P < 0.05).The angular velocity of knee joint was significantly different(P < 0.01).The angular velocity of hip joint in control group was significantly different before and after intervention(P < 0.05).3 Air stroke stage: the arm swing time of the experimental group was significantly shortened after intervention,and there was a significant difference in comparison(P <0.05).When the arm was used,the trunk extension Angle of the experimental group was significantly different(P < 0.01),and the trunk right rotation Angle was significantly different(P < 0.05).There were significant differences in shoulder abduction and internal flexion angles before and after intervention in the experimental group(P < 0.05).During arm swing,the trunk flexion of the experimental group before and after intervention had a significant difference(P < 0.05),and the trunk left-hand rotation Angle had a very significant difference(P < 0.01).The left rotation Angle of trunk in control group was significantly different before and after intervention(P < 0.05).The external rotation Angle of the shoulder joint of the experimental group and the control group was significantly different before and after intervention(P < 0.05).The elbow flexion Angle of the experimental group was significantly different before and after intervention(P < 0.01).The angular velocities of the trunk,shoulder and elbow joints of the experimental group were significantly improved after intervention.The angular acceleration of the trunk of the experimental group before and after intervention had a very significant difference(P < 0.01),and the angular velocities of the shoulder and elbow joints had a significant difference(P< 0.05).4 Landing stage: At the moment of landing,there were significant differences in hip and knee flexion angles before and after intervention in the experimental group(P <0.05),and very significant differences in ankle toe flexion angles(P < 0.01);There were significant differences in hip and ankle flexion angles before and after intervention in control group(P < 0.05).The maximum flexion angles of hip and knee in the experimental group were significantly different before and after intervention(P< 0.05),and the maximum flexion angles of ankle were significantly different(P <0.01).The range of ankle joint movement in the experimental group and the control group was significantly improved after intervention,with significant difference before and after comparison(P < 0.01).Research conclusions: 1.In the run-up stage,the last step stride,arm swing amplitude,knee joint and ankle joint flexion Angle of the experimental group were significantly improved,reflecting that the athletes’ body became more stable during the run-up process,and the lower limbs extended and the upper limbs wigged more fully.2.In the take-off stage,the buffer time,the vertical velocity of the center of gravity and the angular velocity of the hip,knee and ankle joints of the experimental group were significantly improved,which made the Angle and speed of the lower limb joints of the experimental group closer to the optimal value of human take-off movement during the take-off process.3.In the air hitting stage,the trunk and shoulder joint movement of the experimental group was larger and the action was more stretched;The motion Angle of the torso and shoulder joint is also improved during the arm swing,which promotes the full whipping of the arm.The torsional angular acceleration of the torso as well as the angular velocity of the shoulder joint and the elbow joint have been significantly improved,making the spike faster and more powerful.The Angle and speed of the trunk,shoulder and elbow joints of the experimental group are more similar to the standard action of the elite players in the air.4.In the landing stage,the flexion Angle and range of motion of the lower limb joints of the experimental group were significantly improved,and the flexion movement of the hip,knee and ankle joints could be better used to alleviate the impact force of hitting the ground and reduce the risk of injury caused by landing.After the intervention,the upper,lower limbs and waist and abdominal strength of the athletes in the experimental group were improved more,so that the sports performance was improved,and the technical movements in each stage of spiking had obvious improvement in kinematic theory. |
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