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Research of the Correlation between Kinetic Chain of Tennis First Serve and Muscles’ Mobilization

Author: XuLongYu
Tutor: XiongKaiYu
School: Beijing Sport University
Course: Human Movement Science
Keywords: Tennis ball blow action Three-dimensional image analysis Surface electromyography Powertrain
CLC: G845
Type: Master's thesis
Year: 2011
Downloads: 234
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Abstract

Objective: To study first serve tennis serve motion kinetic chain and its corresponding muscle workload acting state, in order to find a key link in the kinetic chain tee, muscle force situation on the final ball of the implications for coaches, athletes improve technical movements serve to improve the tee speed, targeted for serving special physical training, provide a scientific basis to avoid sports injuries. Research Methods: national secondary and higher professional tennis player 7 (males), using surface EMG acquisition subjects' hair flat swing in 16 muscle EMG. Using three-dimensional high-speed camera resolution on the service motion kinematics analysis, combined with EMG derivation tee kinetic chain kinetic chain models and key links. Results: 1 left knee angle at the end of the racket was 101.2 ± 16.2 degrees, and its value is negatively correlated with the ball (r = -0.694); 2. Joint angle at the end of the racket was -13.8 ± 6.9 degrees, with ball There was a negative correlation (r = -0.733); 3. center of gravity in the process of hitting the Y axis moving distance and ball speed was positively correlated (r = 0.658); 4. hitting action in the various aspects of the acceleration and braking with a certain correlation between hip - knee, shoulder - hip occurrence time difference between the maximum speed was negatively correlated with the ball, racket head - Wrist maximum speed difference between the occurrence of a negative correlation with the ball; 5. batting, washed peak muscle force The sequence of the corresponding kinetic chain link transmission in the same order, the active muscle force peak in the corresponding part of the acceleration phase; 6. swing to hit the ball in the lower limb muscles, hip muscles and abdominal muscles relative value of the contribution rate larger shoulder muscles as well as the overall value of the contribution rate of the upper limb muscles smaller; 7. wrist joint flexors and right deltoid front, left rectus abdominis, left gluteus maximus, left rectus femoris correlated with ball the result is positive. Conclusions: 1. Through the adjacent part of the relationship between acceleration and braking deduced Tennis - hair service motion kinetic chain model: Knee kicking starting the reaction force, hip, shoulder, elbow, wrist turn acceleration and braking energy transmitted to the racket head will eventually hit the ball. 2 joint, torso, and the wrist is a key link in the kinetic chain. Reduce knee racket angle end, twist the torso to strengthen the magnitude and speed, as well as the obvious \3. The kinetic chain, each link in order active muscle force and power transmission chain links in the same order, the active muscle force peak in the corresponding part of the acceleration phase. Power chain link with cloth peak muscle force between the time difference is the driving force chain energy transfer important factor. 4. Strengthen the gluteus maximus, left and right rectus abdominis, obliques about the strength of the core muscles can improve on the tee during core stability, thereby enhancing the ball speed. 5. Increasing right wrist joint flexors and right deltoid front, left rectus abdominis, left gluteus maximus, the contribution rate of the left rectus femoris ball speed can be increased.

Research of the Correlation between Kinetic Chain of Tennis First Serve and Muscles’ Mobilization

Abstract

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