The Study On The Effect And Motion Locus Of The Free Arm In The Stroke Of Badminton

Badminton is a competitive sport,to keep it evergreen,inherit the excellent tactical nous and share this competitive sport with people all over the world ,some researches have been done to make the theories of badminton unceasing innovate,development and perfection。In this way,the theory can be a guiding principal of the development of badminton。The research can give us some new ideas and take the tactic nous to the very highest level。The study on the effect and motion locus of the free arm in the stroke of badminton provides a science and reasonable basis for the amateurs and helps to standardize the basic skill in badminton。Also,it is very important to the optimization of badminton。What is more important,as the badminton is a typical unilateral limbs sport ,it is necessary to study the effect and motion locus of the free arm to maintain both limbs of the sportsman symmetrical and sound development。It will be of great significance to both the popularization and development of badminton and the improvement of tactic nous standard。In this paper,the authors discuss the effect of the free arm during playing badminton and the start-stop points and motion locus of the free arm,by methods of documentation,questionnaire survey,design of experiments and case study。1.The science and reasonable movement of the free arm is effective to greater hitting power,increase the speed of movement,keep the balance,maintain the symmetry of upper limbs and the beauty of movement。2. There is a regularity in the motion locus of the free arm when doing the homogeneous movement。But the lack of research of the free arm has resulted in the ignorance of the effect of the free arm and the importance of normative training of the motion locus both in the teaching ,training and scientific research of badminton。3.the start and stop points and motion locus of the free arm in forecourt shot。The start and stop points of the free arm is symmetrical with the other arm to the vertical axis, while the angel between the upper arm and body in the sagittal plane is 10°-15°approximately,the angel between the upper arm and the forearm is almost 90°,natural relaxed。When hitting the ball,the free arm raise up,keeping the angel between the upper arm and forearm unchanged。Then,when reaching the coronal plane,go on raising the forearm while the upper arm unchanged until the moment hitting the ball to assist to hit the ball。When hitting the ball,both arms and shoulders almost in a line,then,go back to the start point,also known as the stop point, to prepare for the next hitting。...